JP7197440B2 - 磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末 - Google Patents

磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末 Download PDF

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Publication number
JP7197440B2
JP7197440B2 JP2019139772A JP2019139772A JP7197440B2 JP 7197440 B2 JP7197440 B2 JP 7197440B2 JP 2019139772 A JP2019139772 A JP 2019139772A JP 2019139772 A JP2019139772 A JP 2019139772A JP 7197440 B2 JP7197440 B2 JP 7197440B2
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Japan
Prior art keywords
magnetic field
magnetic
recording medium
iron oxide
less
Prior art date
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Application number
JP2019139772A
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English (en)
Japanese (ja)
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JP2021022415A (ja
JP2021022415A5 (enExample
Inventor
貴士 藤本
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.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
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 Fujifilm Corp filed Critical Fujifilm Corp
Priority to JP2019139772A priority Critical patent/JP7197440B2/ja
Priority to CN202010754770.0A priority patent/CN112309438A/zh
Priority to US16/942,940 priority patent/US20210035604A1/en
Publication of JP2021022415A publication Critical patent/JP2021022415A/ja
Publication of JP2021022415A5 publication Critical patent/JP2021022415A5/ja
Application granted granted Critical
Publication of JP7197440B2 publication Critical patent/JP7197440B2/ja
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G11B5/65—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
    • G11B5/658—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition containing oxygen, e.g. molecular oxygen or magnetic oxide
    • 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
    • G11B5/714—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 the dimension of the magnetic particles
    • 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
    • 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
    • G11B5/706—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 the composition of the magnetic material
    • G11B5/70605—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 the composition of the magnetic material metals or alloys
    • G11B5/70621—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 the composition of the magnetic material metals or alloys containing Co metal or alloys
    • 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
    • G11B5/706—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 the composition of the magnetic material
    • G11B5/70626—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 the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—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 the composition of the magnetic material containing non-metallic substances iron oxides
    • 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
    • G11B5/706—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 the composition of the magnetic material
    • G11B5/70626—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 the composition of the magnetic material containing non-metallic substances
    • G11B5/70642—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 the composition of the magnetic material containing non-metallic substances iron oxides
    • G11B5/70678—Ferrites
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/735—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer
    • G11B5/7356—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer characterised by the back layer comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2
    • 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
    • G11B5/73—Base layers, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer
    • G11B5/736—Non-magnetic layer under a soft magnetic layer, e.g. between a substrate and a soft magnetic underlayer [SUL] or a keeper layer

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Record Carriers (AREA)
JP2019139772A 2019-07-30 2019-07-30 磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末 Active JP7197440B2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2019139772A JP7197440B2 (ja) 2019-07-30 2019-07-30 磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末
CN202010754770.0A CN112309438A (zh) 2019-07-30 2020-07-30 磁记录介质、磁记录再生装置及ε-氧化铁粉末
US16/942,940 US20210035604A1 (en) 2019-07-30 2020-07-30 MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING AND REPRODUCING DEVICE, AND e-IRON OXIDE POWDER

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019139772A JP7197440B2 (ja) 2019-07-30 2019-07-30 磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末

Publications (3)

Publication Number Publication Date
JP2021022415A JP2021022415A (ja) 2021-02-18
JP2021022415A5 JP2021022415A5 (enExample) 2021-10-07
JP7197440B2 true JP7197440B2 (ja) 2022-12-27

Family

ID=74259720

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019139772A Active JP7197440B2 (ja) 2019-07-30 2019-07-30 磁気記録媒体、磁気記録再生装置およびε－酸化鉄粉末

Country Status (3)

Country Link
US (1) US20210035604A1 (enExample)
JP (1) JP7197440B2 (enExample)
CN (1) CN112309438A (enExample)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002260212A (ja) 2001-02-28 2002-09-13 Fuji Photo Film Co Ltd 六方晶系フェライト及びこれを用いた磁気記録媒体
JP2005251351A (ja) 2004-03-08 2005-09-15 Fuji Photo Film Co Ltd 磁気記録媒体および強磁性金属粉末の製造方法
JP2006344379A (ja) 2002-03-18 2006-12-21 Hitachi Maxell Ltd 磁気記録媒体および磁気記録カートリッジ
JP2019067466A (ja) 2017-09-28 2019-04-25 富士フイルム株式会社 マイクロ波アシスト記録用磁気記録媒体、磁気記録装置および磁気記録媒体の製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060068232A1 (en) * 2004-09-24 2006-03-30 Hitachi Maxell, Ltd. Magnetic tape

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002260212A (ja) 2001-02-28 2002-09-13 Fuji Photo Film Co Ltd 六方晶系フェライト及びこれを用いた磁気記録媒体
JP2006344379A (ja) 2002-03-18 2006-12-21 Hitachi Maxell Ltd 磁気記録媒体および磁気記録カートリッジ
JP2005251351A (ja) 2004-03-08 2005-09-15 Fuji Photo Film Co Ltd 磁気記録媒体および強磁性金属粉末の製造方法
JP2019067466A (ja) 2017-09-28 2019-04-25 富士フイルム株式会社 マイクロ波アシスト記録用磁気記録媒体、磁気記録装置および磁気記録媒体の製造方法

Also Published As

Publication number Publication date
US20210035604A1 (en) 2021-02-04
JP2021022415A (ja) 2021-02-18
CN112309438A (zh) 2021-02-02

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