JPS57183629A - Magnetic coat medium of vertical orientation and its production - Google Patents

Magnetic coat medium of vertical orientation and its production

Info

Publication number
JPS57183629A
JPS57183629A JP56067328A JP6732881A JPS57183629A JP S57183629 A JPS57183629 A JP S57183629A JP 56067328 A JP56067328 A JP 56067328A JP 6732881 A JP6732881 A JP 6732881A JP S57183629 A JPS57183629 A JP S57183629A
Authority
JP
Japan
Prior art keywords
layer
vertical
magnetic
orientation
vertical orientation
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
JP56067328A
Other languages
Japanese (ja)
Inventor
Akio Otsubo
Yuji Sato
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 JP56067328A priority Critical patent/JPS57183629A/en
Publication of JPS57183629A publication Critical patent/JPS57183629A/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
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G11B5/716—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by two or more magnetic layers

Abstract

PURPOSE:To obtain a recording medium having a smooth surface with good vertical orientation and high output, by using fine particles of a specific single magnetic domain for a vertical recording layer and using a two-layer medium including a high-permeability layer for the lining of the said vertical recording layer along with an oriented electromagnet having small rugged parts on the surface of the magnetic pole to perform current transformation and degaussing. CONSTITUTION:A vertical recording layer is formed with hexagonal Co globular fine particles (preferably hexagonal particles of Co-Ni alloy containing <=30wt% Ni to enhance the weather resistance, oxidization resistance) or fine particles having the form anisotropy of Fe, etc. with 1.6-1.4 axis ratio and having a small reduction degree of vertical orientation regardless of calendering. A two-layer medium containing a layer made of the multimagnetic domain size particles having high permeability equal to or higher than that of the said vertical recording medium is used for the lining of this recording layer, and small rugged parts are formed on the magnetic pole surface at the side where an electromagnet for vertical orientation has contact and orientation. At the same time, AC degaussing is carried out by an electromagnet with the space of the magnetic pole surface increased gently at the tape flow-out side. As a result, a magnetic layer having no rugged part during vertical orientation is obtained, and at the same time the return of orientation due to a counter magnetic field is prevented to obtain an excellent magnetic recording medium.
JP56067328A 1981-05-03 1981-05-03 Magnetic coat medium of vertical orientation and its production Pending JPS57183629A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56067328A JPS57183629A (en) 1981-05-03 1981-05-03 Magnetic coat medium of vertical orientation and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56067328A JPS57183629A (en) 1981-05-03 1981-05-03 Magnetic coat medium of vertical orientation and its production

Publications (1)

Publication Number Publication Date
JPS57183629A true JPS57183629A (en) 1982-11-12

Family

ID=13341840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56067328A Pending JPS57183629A (en) 1981-05-03 1981-05-03 Magnetic coat medium of vertical orientation and its production

Country Status (1)

Country Link
JP (1) JPS57183629A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150498A2 (en) * 1984-01-14 1985-08-07 Bayer Ag Perpendicular Magnetic Recording Medium
US6964811B2 (en) 2002-09-20 2005-11-15 Hitachi Maxell, Ltd. Magnetic powder, method for producing the same and magnetic recording medium comprising the same
US7238439B2 (en) 2003-02-19 2007-07-03 Hitachi Maxell, Ltd. Magnetic recording medium containing particles with a core containing a Fe16N2 phase
US7267896B2 (en) 2002-03-18 2007-09-11 Hitachi Maxell, Ltd. Magnetic tape and magnetic tape cartridge

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150498A2 (en) * 1984-01-14 1985-08-07 Bayer Ag Perpendicular Magnetic Recording Medium
US7267896B2 (en) 2002-03-18 2007-09-11 Hitachi Maxell, Ltd. Magnetic tape and magnetic tape cartridge
US7291409B2 (en) 2002-03-18 2007-11-06 Hitachi Maxell, Ltd. Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette
US7445858B2 (en) 2002-03-18 2008-11-04 Hitachi Maxell, Ltd. Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette
US6964811B2 (en) 2002-09-20 2005-11-15 Hitachi Maxell, Ltd. Magnetic powder, method for producing the same and magnetic recording medium comprising the same
US7510790B2 (en) 2002-09-20 2009-03-31 Hitachi Maxell, Ltd. Magnetic powder, method for producing the same and magnetic recording medium comprising the same
US7238439B2 (en) 2003-02-19 2007-07-03 Hitachi Maxell, Ltd. Magnetic recording medium containing particles with a core containing a Fe16N2 phase
US7700204B2 (en) 2003-02-19 2010-04-20 Hitachi Maxell, Ltd. Magnetic recording medium containing particles with a core containing a FE16N2 phase

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