JPS6045931A - Magnetic head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Field of application of the invention] The present invention relates to a thin film head structure with excellent reliability.

[Background of the invention]

Generally, in a magnetic disk drive device, as shown in FIG. 1, a head 2 is placed above a medium 1 with a narrow gap, e.g.
It performs information writing and reproducing operations while floating at micrometers. The structure of the head 2 consists of a support arm 3, a load spring 4, a slider 5, and a thin film head element part 6 (hereinafter referred to as the element part 15).
FIG. 2 shows a front view of the medium 1Vc viewed from the opposite side. The head 2 is designed so that a flying edge is generated when the medium 1 travels in the direction VC of the arrow 7 on the slider 5, and when this and the force of the load spring 4 are balanced, the head 2 floats. On the other hand, when the medium 1 is stopped, the head 2 is in direct contact with the medium 1rC due to the spring pressure of the load spring 4. When the medium gradually starts to rotate, the air on the medium also starts to rotate, and the air flows into the tapered part 8 provided at the end of the slider 5 of the head 2, causing the slider 5 to rotate. A lifting force is generated. For a while, until the medium 1 reaches a predetermined rotation speed, the medium 1 and the head 2 move relative to each other while mechanically rubbing against each other. When the rotation becomes faster, the head 2 completely rotates against the medium 1 as shown in FIG. It stands out more. Further, even in a transient state where the medium 1 stops rotating, the sliding phenomenon between the head 2 and the medium 1 appears as in the case of startup. Therefore, since sliding between the two during the start and stop operations of the medium inevitably occurs even under normal customer use conditions, when designing this device, it is necessary to design a head and a head that can withstand sliding between the two in advance. The material and shape of the media are major technical issues. In conventional thin film heads, this slider material is made of aluminum titanium, for example. Carbide (
AI! 20s-TiC) Yari Chilam-Silicate Crystal (
The product name ``Photoserum'') is used. All of these are nonmagnetic materials. The former is a hard material with a Vickers hardness of about 2,000 to 2.300. Although it is excellent in terms of preventing wear on the element, when we actually manufactured the head and conducted a repeated durability test of the above starting and fishing operations, we found that it lasted approximately 31 mouths 00 to s.
After , o o, o operations, the so-called head cranni phenomenon occurred, and the magnetic paint on the medium peeled off, making it impossible to reproduce the information recorded on the other side. We investigated the cause of this accident and found that the material of the slider 5 of the head 2 is much harder than the medium IVc, so the head was hardly damaged and the medium 1 was damaged unilaterally. It turned out to be. In addition, in such durability tests where only one head 2 is tested, in order to guarantee safe quality under customer usage conditions, VC is normally repeated 100,000 times or less without significant damage to information quality. is needed. Next, in the case of the slider 5 of "Botoseram", which is another conventional hot type, this material is glassy and has few pores, so it is suitable for forming a thin film on it. It has the advantage of good workability. Vickers hardness is around 500. However, when a gutter element was formed as a thin film on this slider and the durability test was conducted, the output voltage was approximately 6.000 to 109 mm.
It decreased when the number of repetitions was 0, and stable information processing operation became impossible. In this case, A/20s-TiC
Unlike the slider shown in FIG. 1, it was found that the cause was not so much damage to the medium 1 as the magnetic circuit changed due to wear of the slider 5 and element section 6 of the head 2, making it impossible to maintain the initial performance. By the way, N is a slider material that has good results in the durability test and is widely used in products with a smile.
i −Z n or M n −Z n phen−(
) material (Vickers hardness 500-700). In another conventional embodiment, the slider and the electromagnetic transducer part (also made of ferrite material) are used in the same way.A thin-film head was fabricated as an extension of this idea, as shown in Figure 3. This is shown in a cross-sectional view, i.e.
The slider 9 is made of the ferrite material and has a shape similar to the slider 5 shown in FIG. Also, since this is a magnetic material, it is also used as one of the core legs constituting the closed magnetic circuit of the electromagnetic conversion element. The structure of the element section will be explained in more detail.As shown in FIG. 3, an insulating film is formed as a gear lug material 10 on the ferrite slider 9, which serves as one coyn. Next, a conductor layer 11 is deposited and then patterned into a predetermined shape. After forming an insulating layer thereon again, a magnetic layer 12 is formed which serves as the other core leg and forms a closed magnetic path with the slider 9 and the gearing 1o interposed therebetween. Note that before forming the magnetic layer 12, the area 130 of the gap insulating film is removed in advance to create a closed magnetic path. Also, bonding to facilitate the connection between the thin connection wire 14 to the external circuit and the conductor layer 11 of the cough head (rose) 154. A protective member other than, for example, an Albas sputtered film is attached to protect the element portion. In FIG. 3, the former protective film 16 is illustrated. It can be said that this type of thin film head actively utilizes the excellent characteristics of a slider and the characteristics of a magnetic material. However, this conventional example also has drawbacks. It is the dimension 1 of the core exposed on the medium facing surface 17: +
, l:x is unbalanced, and what is particularly problematic is the dimension l! on the slider side! I is large. That is, for example, the thickness Z*#'i of the thin film magnetic layer 12 manufactured by vapor deposition, sputtering, or deposition method is 1 to 5 μm.
However, since /+ is approximately equal to the length of the slider 9 in the medium running direction, /I=5 to 4■, compared to 12, /IFi can be considered to be almost infinite. As shown in FIG. 4, the distribution of the strength Hx of the magnetic field leaking from the gap 10 to the location where the medium 1 exists is asymmetrical with respect to the center of the gap (x=0) K, and on the slider 9 side. The distribution of HX becomes wider than that on the magnetic layer 12 side. Therefore, in high-density recording, interference occurs between adjacent pulses, resulting in a decrease in resolution. In other words, the steep magnetic field distribution and high resolution of the thin-film head due to its minute shape cannot be fully utilized. [Object of the Invention] The object of the present invention is to improve the above-mentioned drawbacks of conventional heads, and to provide a new head that takes advantage of the excellent electromagnetic conversion characteristics of a thin film head and also has durability in sliding with a medium. There is a particular thing. Summary of the Invention The special feature of the present invention is that Ni is used as a slider material to generate flying edges of the head in a magnetic storage device where the medium and the head come into contact with each other when the medium starts and stops running. - Zn or Mn Zn ferrite is used, and the thickness is 11 to prevent mutual magnetic interference.
The electromagnetic transducer section is installed with a non-magnetic material interposed therebetween. [Embodiment of the Invention] FIG. 5 is a sectional view showing an embodiment of the present invention. The slider 18 is made of Ni--Zn or Mn--Zn ferrite to provide durability in sliding with the medium. The difference from the conventional head shown in FIG. 6 is that this head is not used as one of the core legs, but is used exclusively as a slider. For this reason, ferrite 18
AI on top! A nonmagnetic material such as a tOs (alumina) film 19 is formed to a predetermined thickness by sputtering, and then a thin film head element portion is fabricated on this film. Since ferrite is not used as one of the core legs, the thin film head element in this case forms the lower magnetic layer 20 and forms a closed magnetic path. The aluminum film 19 protects the element part, fills the vacancies in the ferrite as a slider material, provides a rough surface for forming the element part, and forms a magnetic cup between the ferrite, which is a magnetic material, and the element part. It is necessary to make the ring thick enough so that it does not pose a problem in actual use. If such a structure is adopted, the above-mentioned intended functions will occur at the same time, and a head with good electromagnetic conversion characteristics and mechanical characteristics can be obtained. In addition, as another example, Al εs1j by sputtering method
It is also possible to form the element portion on another non-magnetic substrate 19 after ij9, and then glass-weld the slider 18 and the substrate 19.

[Brief explanation of the drawing]

1 and 2 are a side view and a plan view showing the usage state and structure of a magnetic disk head, FIG. 3 is an enlarged cross-sectional view of the vicinity of the element section showing the structure of a conventional thin film head, and FIG. 6
FIG. 5 is a waveform diagram showing the leakage magnetic field distribution generated from the head, and FIG. 5 is a sectional view of the head showing an embodiment of the present invention. 1... Medium 2... Head 18... Ferrite (slider) 19... Al ξ film 20... Lower magnetic layer O 1 n 3 O 2

Claims (1)

[Claims] In a magnetic storage device in which the medium and the head come into contact with each other when the medium starts and stops running, Ni-Zn I) or Mn-zn ferrite is used as the slider material that generates the flying edge of the head, and magnetic A magnetic head characterized in that an electromagnetic transducer section is installed with a non-magnetic material having a thickness sufficient to prevent mutual interference interposed therebetween.