JPS57158014A - Vertical magnetic recording medium - Google Patents

Vertical magnetic recording medium

Info

Publication number
JPS57158014A
JPS57158014A JP56044963A JP4496381A JPS57158014A JP S57158014 A JPS57158014 A JP S57158014A JP 56044963 A JP56044963 A JP 56044963A JP 4496381 A JP4496381 A JP 4496381A JP S57158014 A JPS57158014 A JP S57158014A
Authority
JP
Japan
Prior art keywords
thickness
hpl
vertical
magnetization
specified
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
JP56044963A
Other languages
Japanese (ja)
Inventor
Akio Otsubo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP56044963A priority Critical patent/JPS57158014A/en
Publication of JPS57158014A publication Critical patent/JPS57158014A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/64—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent
    • G11B5/66—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE:To obtain a medium on which a high-density high reproduction output is recorded vertically by specifying the saturation magnetization of a vertical magnetization recording layer and a high-conductivity layer under it, and the thickness, etc., of the high-conductivity layer and a unipolar head under specific conditions. CONSTITUTION:With regard to a solid disk on which vertical magnetic recording is performed by energizing a unipolar head 3 which has thickness Tr in the run direction of the medium, the saturated magnetization Ms(R) of a vertical magnetization recording layer 1 is so specified that Ms(R)>HK/4pi(HK: anisotropic magnetic field). Further, the saturation magnetization Ms(HPL) of a high-conductivity layer 2 as the base of the recording layer 1 is so specified that Ms(HPL)>= Ms(R), and the thickness delta(HPL) of the high-conductivity layer 2 is so specified that delta(HPL)>TR. For example, on a permalloy plate (having 0.1mm. thickness) 2 having Ms nearly equal to that of Co, Co is vacuum-deposited 1 (to 0.25mum thickness) including several 0/0 P to form a two-layered medium. Then, the unipolar head 3 obtained by winding a coil around a permalloy plate having 0.1mm. thickness TR is used to perform vertical recording.
JP56044963A 1981-03-26 1981-03-26 Vertical magnetic recording medium Pending JPS57158014A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56044963A JPS57158014A (en) 1981-03-26 1981-03-26 Vertical magnetic recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56044963A JPS57158014A (en) 1981-03-26 1981-03-26 Vertical magnetic recording medium

Publications (1)

Publication Number Publication Date
JPS57158014A true JPS57158014A (en) 1982-09-29

Family

ID=12706130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56044963A Pending JPS57158014A (en) 1981-03-26 1981-03-26 Vertical magnetic recording medium

Country Status (1)

Country Link
JP (1) JPS57158014A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000593A1 (en) * 1989-06-28 1991-01-10 Siemens Aktiengesellschaft Magnetic storage device with substrate and thin-film magnetic head

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991000593A1 (en) * 1989-06-28 1991-01-10 Siemens Aktiengesellschaft Magnetic storage device with substrate and thin-film magnetic head

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