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JPS5693123A - Magnetic recording material - Google Patents

Magnetic recording material

Info

Publication number
JPS5693123A
JPS5693123A JP16978979A JP16978979A JPS5693123A JP S5693123 A JPS5693123 A JP S5693123A JP 16978979 A JP16978979 A JP 16978979A JP 16978979 A JP16978979 A JP 16978979A JP S5693123 A JPS5693123 A JP S5693123A
Authority
JP
Japan
Prior art keywords
layer
coercive force
magnetic
recording
magnetic recording
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP16978979A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hotta
Tadao Katsuragawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP16978979A priority Critical patent/JPS5693123A/en
Publication of JPS5693123A publication Critical patent/JPS5693123A/en
Pending legal-status Critical Current

Links

Landscapes

  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE: To obtain a magnetic recording material which excels in the wear resisttance, sensitivity and frequency characteristic with a short wavelength each, by forming the magnetic recording layer with two layers with the magnetic powder having a specified large value of coercive force used for the upper layer and the magnetic powder having a specified small value of coercive force used for the lower layer respectively.
CONSTITUTION: The lower layer 2 containing the magnetic substance of 300W 1,000 Oe coercive force is formed on the surface of the substrate 1, and upper layer 3 containing 1,200W2,000 Oe coercive force is formed on the layer 2. The magnetic substances such as γ-Fe2O3, Fe3O4, CrO2 and the like are used for the layer 2; and Co-Fe group alloy, Co (adsorption) Fe3O4, Fe and the like are used for the magnetic substances of the layer 3. As a result, the coercive force as a while is capable of recording and reproduction with the conventional head to secure the short-wavelength recording properties more excellent than conventional. At the same time, such defects of the conventional 2-layer structure can be eliminated as easy wear, a limit to a large amount of coercive force or a large amount of demagnetization caused by heating and pressurizing and other factors.
COPYRIGHT: (C)1981,JPO&Japio
JP16978979A 1979-12-26 1979-12-26 Magnetic recording material Pending JPS5693123A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16978979A JPS5693123A (en) 1979-12-26 1979-12-26 Magnetic recording material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16978979A JPS5693123A (en) 1979-12-26 1979-12-26 Magnetic recording material

Publications (1)

Publication Number Publication Date
JPS5693123A true JPS5693123A (en) 1981-07-28

Family

ID=15892900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16978979A Pending JPS5693123A (en) 1979-12-26 1979-12-26 Magnetic recording material

Country Status (1)

Country Link
JP (1) JPS5693123A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864634A (en) * 1981-10-13 1983-04-18 Hitachi Maxell Ltd Magnetic recording medium
US4946374A (en) * 1983-03-20 1990-08-07 Hitachi Maxell, Ltd. Magnetic recording medium
US5230818A (en) * 1991-12-20 1993-07-27 Eastman Kodak Company Coating compositions for master media for anhysteretic recording

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864634A (en) * 1981-10-13 1983-04-18 Hitachi Maxell Ltd Magnetic recording medium
JPH0353690B2 (en) * 1981-10-13 1991-08-15 Hitachi Maxell
US4946374A (en) * 1983-03-20 1990-08-07 Hitachi Maxell, Ltd. Magnetic recording medium
US5230818A (en) * 1991-12-20 1993-07-27 Eastman Kodak Company Coating compositions for master media for anhysteretic recording

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