JP2004110896A - Perpendicular magnetic recording/reproducing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel perpendicular magnetic recording/reproducing system capable of surely recording a magnetization inverting signal with a plurality of bits in a block area (wider than a magnetic track width) constituting a position detection mark. <P>SOLUTION: This disk magnetic recording medium is constructed in such a manner that a data zone for recording/reproducing magnetic information and a servo zone having a position detection mark for detecting the relative positions of the magnetic head and the track on the magnetic recording medium are alternately arrayed at a fixed interval in the circumferential direction of the track. The position detection mark is constituted of a plurality of block areas in which the magnetic layer of the same material as that of a magnetic track is formed in a physically separated manner, each block area is constituted of a magnetic zone in which data are recorded by a plurality of bits, and the magnetic head has a magnetic recording magnetic pole for perpendicularly recording magnetization information on the magnetic track, a magnetic information reproducing element for reproducing the magnetic information recorded on the magnetic track, and a servo signal recording magnetic pole for perpendicularly recording a magnetization inverting sinal in the block area constituting the position detection mark. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a perpendicular magnetic recording / reproducing system in which a combination of a new configuration of a magnetic recording medium and a magnetic head is created. In particular, an off-track signal (servo signal) sufficient for tracking operation of a disc-shaped discrete magnetic recording medium In addition to being able to perpendicularly record the original magnetic information on the magnetic track at a high density with the integrated composite magnetic head provided in advance in the system, the block area (magnetic track width) constituting the position detection mark can be obtained. The present invention relates to a perpendicular magnetic recording / reproducing system capable of recording a plurality of bits of a perpendicular magnetization reversal signal in a wider magnetic bandwidth.
[0002]
[Prior art]
[Patent Document 1] JP-A-6-195907
[0003]
As a storage medium (magnetic recording medium) for a computer or the like, a so-called hard disk capable of random access has been used.
[0004]
In recording and reproducing data on and from such a hard disk, recording (writing) of a magnetic signal is usually performed while moving the magnetic head in the radial direction and confirming that the magnetic head is accurately scanning a predetermined data track. Or, reproduction (reading) is performed.
[0005]
By the way, in order to cope with recent high-density recording, for example, as an effective recording medium structure for improving track density, a so-called discrete track type in which magnetic tracks are magnetically separated is called a discrete track type. Proposals for media structures have been made.
[0006]
Such a discrete track type medium usually has a data zone for recording and reproducing magnetic information and a servo having a position detection mark for detecting a relative position between the magnetic head and a track on the magnetic recording medium. Zones, which are alternately arranged at regular intervals in the circumferential direction of the track.
[0007]
Usually, a dedicated pattern called a position detection mark (servo pattern) for tracking is formed in the servo zone. This dedicated pattern is formed as a predetermined pattern group shifted by a half track pitch with respect to a magnetic track (data track) for tracking, and is formed with a magnetic track pitch wider than the magnetic track width. Is common.
[0008]
Such a predetermined pattern group is formed by physically separating a magnetic layer made of the same material as the magnetic track, and is usually finely separated to a length of about 1 bit in the circumferential direction. These are used as a signal magnetic field after being magnetized in one direction by an external magnetic field.
[0009]
However, with such unidirectional magnetization, the reproduction output is reduced to half that of normal magnetic recording. (In addition, when a region corresponding to one bit of a servo signal is physically separated and processed, the edge may be rounded due to the influence of the processing resolution, and it may be difficult to obtain a servo reproduction output proportional to the off-track amount. )
[0010]
Although it is not intended for perpendicular magnetic recording to solve such a problem, as a method of an in-plane recording medium, Japanese Patent Application Laid-Open No. HEI 6-195907 (Patent Document 1) discloses a method of writing a servo signal on a servo signal. A method of improving a layer form and writing a servo signal to a write portion thereof is disclosed.
[0011]
[Problems to be solved by the invention]
However, the magnetic head disclosed in this publication includes a magnetic head 12 for reading a reproduced signal recorded on the periphery of a medium and a magnetic head 11 for writing a servo signal based on the reproduced signal. It is unclear how the head 11 is positioned relative to the head for writing data tracks. Further, when the system is considered as a system for recording and reproducing on a magnetic recording medium, the system configuration is not clear.
[0012]
By the way, the following aspects can be considered as the timing for performing the process of writing the necessary servo signal to the magnetic recording medium.
[0013]
(1) Before incorporating a magnetic recording medium into a recording / reproducing system, a servo signal (tracking data) is recorded by a medium writing-only device. That is, before mounting (incorporating) the medium in the magnetic recording / reproducing system, a servo signal is recorded on the medium in advance.
[0014]
(2) A medium is incorporated as a magnetic recording / reproducing system, and a servo signal is recorded on the medium using a recording head unit of a normal recording / reproducing magnetic head already incorporated.
[0015]
In the above (1), a dedicated device for writing is required, resulting in an increase in cost. Furthermore, careful handling such as subsequent transport of the written medium is required, which makes handling inconvenient.
[0016]
In the above (2), the portion where the servo signal is written is larger than the so-called magnetic track width, and the writing width is insufficient in the recording head portion of the usual built-in magnetic head, and at least twice for one servo signal width. Must be written. For this reason, not only the operation is complicated, but also there is a possibility that a data position shift occurs due to twice writing.
[0017]
The present invention has been made in view of such circumstances, and an object of the present invention is to solve the above-described problems and to provide a sufficient off-track signal (servo signal) for tracking operation of a disk-shaped discrete magnetic recording medium. In addition to the fact that the system incorporates a new integrated magnetic head as a system in advance, the original magnetic information can be recorded at a high density on the magnetic track, as well as the block area constituting the position detection mark (more than the magnetic track width). Another object of the present invention is to provide a novel perpendicular magnetic recording / reproducing system capable of reliably recording a plurality of bits of a magnetization reversal signal in a wide range.
[0018]
[Means for Solving the Problems]
In order to solve such a problem, the present invention relates to a perpendicular magnetic recording / reproducing system comprising: a disk-shaped magnetic recording medium; and a magnetic head for recording / reproducing magnetic information on / from the magnetic recording medium. The magnetic recording medium has a data zone for recording / reproducing magnetic information and a servo zone having a position detection mark for detecting a relative position between the magnetic head and a track on the magnetic recording medium. A disk-shaped magnetic recording medium alternately arranged at regular intervals in a circumferential direction, wherein the data zones are arranged substantially concentrically and serve as data tracks for recording / reproducing magnetic information. Discrete magnetic separation between adjacent magnetic tracks in the gap between radially adjacent magnetic tracks. Is formed, and the position detection mark is composed of a plurality of block areas formed by physically separating a magnetic layer of the same material as the magnetic track, and the individual block areas record a plurality of bits. A magnetic band for perpendicularly recording magnetization information on the magnetic track; and a magnetic information reproducing element for reproducing magnetic information recorded on the magnetic track. A servo signal recording magnetic pole for perpendicularly recording a magnetization reversal signal in a block area constituting the position detection mark, and the position detection mark is formed by the servo signal recording magnetic pole of the magnetic head. The configuration is such that a magnetization reversal signal for a plurality of bits can be recorded in the block area to be configured.
[0019]
The magnetization reversal signal recorded by the servo signal recording magnetic pole in the present invention is configured to be written to the entire medium including the data zone and the servo zone in the initialization stage.
[0020]
In a preferred aspect of the present invention, the magnetic recording magnetic pole includes a lower magnetic pole positioned on the magnetic information reproducing element side and a writer shield including the servo signal recording magnetic pole (servo signal recording magnetic pole and writer shield). The leakage magnetic field for recording emitted from the magnetic recording magnetic pole and the leakage magnetic field for servo signal recording emitted from the servo signal recording magnetic pole are arranged so as to be substantially sandwiched, respectively. It is configured to be returned to the magnetic pole.
[0021]
In a preferred aspect of the present invention, the width of the servo signal recording magnetic pole is configured to be wider than the track pitch of the magnetic track.
[0022]
In a preferred aspect of the present invention, the width of the servo signal recording magnetic pole is set to be 2 to 100 times the track pitch of the magnetic track.
[0023]
In a preferred aspect of the present invention, a recording coil is provided between the magnetic recording magnetic pole and the lower magnetic pole such that a magnetic path for recording magnetic information is formed by the magnetic recording magnetic pole and the lower magnetic pole. The servo signal recording coil is disposed between the magnetic recording magnetic pole and the writer shield such that a magnetic path for recording the servo signal is formed by the servo signal recording magnetic pole and the lower magnetic pole. It is configured to be.
[0024]
In a preferred aspect of the present invention, the magnetization reversal signal recorded for a plurality of bits is configured to be perpendicularly recorded at a constant frequency by the servo signal recording magnetic pole.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the present invention, as shown in FIG. 8, a disk-shaped magnetic recording medium 1, a magnetic head 100 for recording / reproducing magnetization information on the magnetic recording medium 1 and recording a servo signal, and a magnetic head 100 Arm 75 for rotating the magnetic head to a predetermined radial position of the magnetic recording medium while supporting the arm, a VCM (Voice Coil Motor) 77 serving as a drive source of the arm 75, and controlling these drive systems. And a control unit 80 for controlling the recording / reproducing operation.
[0026]
According to the system of the present invention, (i) an off-track signal (servo signal) having a sufficiently high output is obtained in a tracking operation of a disc-shaped discrete magnetic recording medium, and Incorporating a head, the original magnetic information can be perpendicularly recorded at high density on a magnetic track, and a plurality of bits of magnetization reversal signals are surely perpendicularly recorded in a block area (wider than the magnetic track width) constituting a position detection mark. Is a novel perpendicular magnetic recording and reproducing system. In particular, the configuration of the magnetic recording medium and the configuration of the magnetic head, which are characteristic parts of the system of the present invention, will be described in detail below in order.
[0027]
Configuration of perpendicular magnetic recording medium 1
FIG. 1 is a schematic plan view schematically showing the overall shape of a discrete track type so-called perpendicular magnetic recording medium 1 used in the present invention. FIG. 2 is a schematic enlarged plan view schematically showing an enlarged portion of the minute portion α surrounded by the square in FIG.
[0028]
As shown in FIG. 2, the magnetic recording medium 1 has a data zone D for recording and reproducing magnetic information._ZAnd a servo zone S having a position detection mark 200 for detecting a relative position between the magnetic head 100 and a track on a magnetic recording medium_ZThese are alternately arranged at regular intervals in the circumferential direction of the track.
[0029]
In relation to FIG. 1, the servo zone S is located near the position of a line 8 extending radially outward from the center of the disk._ZCan be considered as being arranged and formed.
[0030]
Data zone D_ZAre arranged substantially concentrically as described above, and have a magnetic track 10 as a data track for recording / reproducing magnetic information. A discrete portion 40 for magnetically separating the adjacent magnetic tracks is formed in a gap between the radially adjacent magnetic tracks 10.
[0031]
The expression that the magnetic tracks 10 in the present invention are “substantially” concentrically arranged ”means not only a so-called“ concentric form ”but also a so-called“ spiral (spiral) form ”. Is included. Further, the servo zone S_ZThe purpose is to include a mode in which the circumference is partially divided by the.
[0032]
The position detection mark 200 in the present invention is composed of a plurality of block regions 210 formed by physically separating a magnetic layer of the same material as the magnetic track, and each of the block regions 210 has a magnetization reversal signal corresponding to a plurality of bits. It consists of a magnetic band (210) to be recorded. The magnetic band (210) has a predetermined circumferential length so that a plurality of bits can be recorded.
[0033]
As described above, in the magnetic band (210) of the present invention, the magnetization reversal signal can be recorded for a plurality of bits, and this state will be described in more detail with reference to FIG.
[0034]
FIG. 3A is a cross-sectional view of one of the block regions 210 (magnetic band (210)) constituting the position detection mark 200. In the block region 210 in FIG. A state where ten signals (indicated by arrows in the magnetic band 210) are recorded is illustrated.
[0035]
FIG. 3B schematically shows the state of the reproduction output based on the vertical recording pattern of FIG. 3A. In the medium specification of the present invention, the maximum reproduction output is as shown in FIG. Is 2H. Incidentally, the servo zone S in the conventional perpendicular recording film_ZFIG. 9 shows an example of the formation of the position detection mark 500 of FIG. 9. One block area 510 in FIG. 9 is composed of five magnetic islands 510a in which one bit of one-way recording is recorded. The states of the magnetization and the state of the reproduction output are shown in FIGS. 10A and 10B (corresponding to FIGS. 3A and 3B, respectively). Since the signal magnetic field of the conventional example shown in FIG. 10A is generally a one-way magnetic field formed by DC magnetizing with a large dedicated magnetic head, it can be seen that the maximum reproduction output is also small as H (FIG. 10). (B)).
[0036]
FIG. 4A shows an example of a general shape of a cross section taken along arrows (γ)-(γ) in FIG. 2, that is, a radial cross section of the data zone Dz. In the embodiment shown in FIG. 4A, in the magnetic recording medium 1, a soft magnetic backing layer 7 having the same width as the track width Tw is formed on the nonmagnetic substrate 5. A perpendicular magnetic recording layer 10 having a width is stacked. The perpendicular magnetic recording layer 10 in this figure has the same meaning as the magnetic track 10 on which recording / reproduction is performed (see FIG. 2). Then, at a position located between these adjacent magnetic tracks 10, adjacent data tracks are magnetically separated from each other, and a concave portion 40 (discrete portion 40) for exerting a discrete action is formed. I have. In FIG. 4A, the symbol Tp indicates the pitch of the magnetic track. The pitch Tp of the magnetic track is about 20 to 500 nm, and the track width Tw is about 15 to 400 nm.
[0037]
As the non-magnetic substrate 5, a substrate usually used for this type of magnetic recording medium, such as aluminum, tempered glass, crystallized glass, or carbon plastic, may be used.
[0038]
As the soft magnetic underlayer 7, NiFe, NiFeNb, NiFeMo, FeAlSi, FeTaC or the like is preferably used. The thickness of the soft magnetic underlayer 7 is about 0.1 to 10 μm.
[0039]
As the perpendicular magnetic recording layer 10, any material such as CoCr, CoCrTa, CoPt, CoCrPt, CoPtCrO, and TbFeCo, which is usually used for a perpendicular magnetic recording layer of this type of magnetic recording medium, may be used. The thickness of the perpendicular magnetic recording layer 10 may be appropriately selected in consideration of a head to be used, a recording wavelength to be used, and the like. Usually, it is about 10 to 100 nm.
[0040]
On the perpendicular magnetic recording layer 10, C, ZrO is provided for the purpose of protecting the magnetic layer.₂, SiO₂It is desirable to form a protective film mainly composed of a material having a thickness of about 1 to 10 nm. If it is formed too thick, there tends to be a problem of spacing loss, and if it is formed too thin, problems such as durability tend to occur. Further, a lubricating film containing various known organic lubricants may be formed on the protective film.
[0041]
The configuration of the magnetic recording medium shown in FIG. 4B is a modification of that of FIG. The medium shown in FIG. 4A is different from the medium shown in FIG. The filled nonmagnetic material 40a has substantially the same function as the discrete portion 40 of FIG. As the non-magnetic material 40a filled in the concave recess 40, for example, SiO.₂, Al₂O₃, C, etc. are preferably used.
[0042]
The configuration of the magnetic recording medium shown in FIG. 4C is a modification of that of FIG. The medium is different from the medium shown in FIG. 4A in that the soft magnetic underlayer 7 is provided on the entire surface on the substrate 5. As shown in FIG. 4C, a concave portion 40 (discrete portion 40) for exerting a discrete action is formed at a position located between adjacent perpendicular magnetic recording layers 10 (magnetic tracks 10).
[0043]
Configuration of magnetic head 100
FIG. 5 is a plan view showing a main part of the magnetic head 100 used in the present invention in a plane, and FIG. 6 is a so-called ABS (Air Bearing Surface) of the magnetic head 100 used in the present invention. Is schematically illustrated as a main part when viewed from the front. ABS refers to the surface facing the magnetic recording medium. FIG. 7 schematically shows essential constituent members as viewed in a cross section taken along line BB of FIG. The lower line in FIG. 5 and the left end line in FIG. 7 correspond to ABS.
[0044]
The magnetic head 100 includes a magnetic recording magnetic pole 110 for perpendicularly recording magnetization information on a magnetic track 10 of the magnetic recording medium 1, and a magnetic information reproducing element 150 for reproducing magnetic information recorded on the magnetic track 10. And a servo signal recording magnetic pole 130 a for perpendicularly recording a magnetization reversal signal in a block area 210 constituting the position detection mark 200 of the magnetic recording medium 1.
[0045]
The magnetic recording magnetic pole 110 includes a lower magnetic pole 160 (also serving as a return path magnetic pole and an upper shield) positioned on the magnetic information reproducing element 150 side, and a writer shield 130 (servo signal recording magnetic pole) having a servo signal recording magnetic pole 130a. (A magnetic pole and a writer shield) so as to be substantially sandwiched therebetween and shielded so as not to perform an unnecessary recording operation due to an external magnetic field.
[0046]
The magnetic recording magnetic pole 110 is connected to the yoke 115 and is connected to the lower magnetic pole 160 via a connecting material 117. Further, a recording coil 180 is interposed and arranged between the lamination of the magnetic recording magnetic pole 110 and the lower magnetic pole 160, and the recording coil 180 is spirally wound around the connecting material 117 substantially at the center. The recording coil 180 makes it possible to form a magnetic path for perpendicular recording by the magnetic recording magnetic pole 110 and the lower magnetic pole 160, and the leakage magnetic field for recording emitted from the magnetic recording magnetic pole 110 is magnetic. The recording medium 1 passes through the soft magnetic underlayer 7 and returns to the lower magnetic pole 160.
[0047]
As described above, the magnetic pole 130a for recording a servo signal is formed separately at a part of the tip of the writer shield 130, and the magnetic pole 130a for recording a servo signal is connected to the yoke 170 and via the connecting member 177. , And the lower magnetic pole 160. The separation of the servo signal recording magnetic pole 130a is performed by an insulating band 131 as shown.
[0048]
Further, a servo signal recording coil 190 is interposed and arranged between the lamination of the writer shield 130 having the servo signal recording magnetic pole 130a and the yoke 170, and the servo signal recording coil 190 is substantially centered on the connecting member 177. , Spirally wound. With the servo signal recording coil 190, it is possible to form a magnetic path for perpendicular recording by the servo signal recording magnetic pole 130 and the lower magnetic pole 160, and to record a servo signal emitted from the servo signal recording magnetic pole 130. Is passed through the soft magnetic backing layer 7 of the magnetic recording medium 1 and returned to the lower magnetic pole 160. The magnetic inversion signal for a plurality of bits can be recorded in the block area 210 forming the position detection mark 200 by the servo signal recording magnetic pole 130 of the magnetic head (see FIG. 3A). ).
[0049]
As shown in FIG. 6, the width Ws of the servo signal recording magnetic pole 130 in the present invention is set to be wider than the track pitch Tp of the magnetic track 10 shown in FIG. In particular, it is desirable that the width Ws of the servo signal recording magnetic pole 130 be about 2 to 100 times the track pitch of the magnetic track. Accordingly, it is possible to record the magnetization reversal signal in a plurality of block areas 210 constituting the position detection mark 200 at a time.
[0050]
The magnetization reversal signal recorded for a plurality of bits is perpendicularly recorded on the entire medium at a constant frequency by the magnetic pole for servo signal recording while moving the magnetic head in the circumferential direction at the initialization stage of the medium.
[0051]
As the magnetic information reproducing element 150 for reproducing magnetic information recorded on the magnetic track, a magneto-resistive element, in particular, an AMR (anisotropic magneto-resistive effect) element, a GMR (giant magneto-resistive effect) element, A TMR (Tunnel Junction Magnetoresistance Effect) element and a CPP (Current Perpendicular to to Plane) GMR element are preferably used. The magnetic information reproducing element 150 is practically sandwiched between a lower shield 151 and a lower magnetic pole 160 having a shielding function.
[0052]
Since tracking control cannot be performed on the magnetic recording medium at the initial stage before formatting, a servo signal of a constant frequency is written on the entire medium by the magnetic signal recording magnetic pole of the magnetic head. Thereby, a plurality of bits of the magnetization reversal signal can be recorded in each block area 210 constituting the position detection mark 200 of the servo zone Sz. Magnetic information is recorded / reproduced on / from the magnetic track while performing a tracking operation based on the servo signal thus recorded. Such a series of operations is performed by the control unit of the system.
[0053]
The magnetic head according to the present invention has an extremely wide servo signal recording magnetic pole in addition to a head component for recording / reproducing. A servo signal whose magnetization has been reversed quickly can be recorded. Further, since the magnetic pole for recording a servo signal is substantially used also as a writer shield, the configuration of the magnetic head itself is extremely compact despite the expansion of the operation capability of recording a servo signal.
[0054]
【The invention's effect】
As described above, the present invention is a perpendicular magnetic recording / reproducing system including a disk-shaped magnetic recording medium and a magnetic head for recording / reproducing magnetic information on / from the magnetic recording medium, wherein the magnetic recording medium comprises: A data zone for recording / reproducing magnetic information and a servo zone having a position detection mark for detecting a relative position between the magnetic head and a track on the magnetic recording medium are fixed in a circumferential direction of the track. A disk-shaped magnetic recording medium alternately arranged at intervals, wherein the data zones are substantially concentrically arranged, and are composed of magnetic tracks as data tracks for recording and reproducing magnetic information, In a gap between radially adjacent magnetic tracks, a discrete portion for magnetically separating adjacent magnetic tracks is formed, The position detection mark is composed of a plurality of block areas formed by physically separating a magnetic layer of the same material as the magnetic track, and each of the block areas is composed of a magnetic band in which a plurality of bits are recorded. A magnetic recording magnetic pole for perpendicularly recording magnetization information on the magnetic track, a magnetic information reproducing element for reproducing magnetic information recorded on the magnetic track, and the position detection mark. The magnetic head has a servo signal recording magnetic pole for perpendicularly recording a magnetization reversal signal in a block area constituting the magnetic head. The servo signal recording magnetic pole of the magnetic head causes magnetization in the block area constituting the position detection mark. The configuration is such that the inverted signal can be recorded for a plurality of bits.
Therefore, a sufficient off-track signal (servo signal) can be obtained in the tracking operation of the disk-shaped discrete magnetic recording medium, and a new integrated magnetic head is incorporated in advance as a system so that the original magnetic information can be highly recorded on the magnetic track. In addition to being able to record at a high density, it is possible to reliably record a plurality of bits of the magnetization reversal signal in the block area (wider than the magnetic track width) constituting the position detection mark.
[Brief description of the drawings]
FIG. 1 is a schematic plan view schematically showing the entire shape of a so-called perpendicular magnetic recording medium of a discrete track type used in the present invention.
FIG. 2 is a schematic enlarged plan view schematically showing an enlarged portion of a minute portion α surrounded by a square in FIG.
FIG. 3A is a cross-sectional view of one of block areas (magnetic bands) constituting a position detection mark, and FIG. 3B is a vertical recording view of FIG. 3A. 6 schematically shows a state of a reproduction output based on a pattern.
FIG. 4A is a schematic sectional view showing an embodiment of a perpendicular magnetic recording medium having a relatively simple structure in order to facilitate understanding of the present invention. (Γ)-(γ) of FIG. 4 (B) and 4 (C) show preferred modifications of FIG. 4 (A).
FIG. 5 is a plan view showing a main part of a magnetic head used in the present invention in a plane.
FIG. 6 is a drawing schematically showing main constituent members of a magnetic head used in the present invention as viewed from the front of a so-called ABS (Air Bearing Surface).
FIG. 7 is a drawing schematically showing main constituent members as viewed in a cross section taken along line BB of FIG. 5;
FIG. 8 is a plan view schematically showing a perpendicular magnetic recording / reproducing system according to the present invention.
FIG. 9 is a drawing for explaining a conventional example compared with FIG. 2;
FIG. 10 is a drawing for explaining a conventional example compared with FIGS. 3A and 3B.
[Explanation of symbols]
1. Magnetic recording medium
5 Non-magnetic substrate
7 Soft magnetic underlayer
10 ... magnetic track
40 ... Discrete part (missing concave part)
100 ... magnetic head
110 ... magnetic pole for magnetic recording
130a: Magnetic pole for recording servo signal
150 ... magnetic information reproducing element
200: Position detection mark
210: Block area (magnetic band)
Dz: Data zone
Sz: Servo zone

Claims (7)

A perpendicular magnetic recording / reproducing system comprising: a disk-shaped magnetic recording medium; and a magnetic head for recording / reproducing magnetization information on / from the magnetic recording medium,
The magnetic recording medium includes a data zone for recording / reproducing magnetic information and a servo zone having a position detection mark for detecting a relative position between the magnetic head and a track on the magnetic recording medium. A disk-shaped magnetic recording medium alternately arranged at regular intervals in the direction,
The data zone is substantially concentrically arranged, is composed of magnetic tracks as data tracks for recording / reproducing magnetic information, and a gap between radially adjacent magnetic tracks is adjacent to a magnetic track. Discrete parts for magnetically separating tracks are formed,
The position detection mark is composed of a plurality of block areas formed by physically separating a magnetic layer of the same material as the magnetic track, and each block area is composed of a magnetic band in which a plurality of bits are recorded. ,
The magnetic head includes a magnetic recording magnetic pole for perpendicularly recording magnetization information on the magnetic track, a magnetic information reproducing element for reproducing magnetic information recorded on the magnetic track, and the position detection mark. And a servo signal recording magnetic pole for perpendicularly recording a magnetization reversal signal in a block area to be magnetized. The servo signal recording magnetic pole of the magnetic head causes magnetization reversal in a block area constituting the position detection mark. A perpendicular magnetic recording / reproducing system capable of recording a signal for a plurality of bits. 2. The perpendicular magnetic recording / reproducing system according to claim 1, wherein the magnetization reversal signal recorded by the servo signal recording magnetic pole is written to the entire medium including a data zone and a servo zone in an initialization stage. The magnetic recording magnetic pole is disposed so as to be substantially sandwiched by a lower magnetic pole located on the magnetic information reproducing element side and a writer shield (servo signal recording magnetic pole and writer shield) having the servo signal recording magnetic pole. Has been
The leakage magnetic field for recording emitted from the magnetic recording magnetic pole and the leakage magnetic field for servo signal recording emitted from the servo signal recording magnetic pole are respectively returned to the lower magnetic pole. The perpendicular magnetic recording / reproducing system according to claim 1. 4. The perpendicular magnetic recording / reproducing system according to claim 1, wherein a width of the servo signal recording magnetic pole is wider than a track pitch of a magnetic track. 5. The perpendicular magnetic recording / reproducing system according to claim 4, wherein a width of the servo signal recording magnetic pole is 2 to 100 times a track pitch of the magnetic track. A recording coil is disposed between the magnetic recording magnetic pole and the lower magnetic pole such that a magnetic path for recording magnetic information is formed by the magnetic recording magnetic pole and the lower magnetic pole,
A servo signal recording coil is disposed between the magnetic recording magnetic pole and the writer shield such that a magnetic path for recording a servo signal is formed by the servo signal recording magnetic pole and the lower magnetic pole. A perpendicular magnetic recording / reproducing system according to any one of claims 1 to 5. 7. The perpendicular magnetic recording / reproducing system according to claim 1, wherein the magnetization reversal signal recorded for a plurality of bits is perpendicularly recorded at a constant frequency by the servo signal recording magnetic pole.

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