WO2009041656A1 - Vertical magnetic recording medium - Google Patents

Vertical magnetic recording medium Download PDF

Info

Publication number
WO2009041656A1
WO2009041656A1 PCT/JP2008/067555 JP2008067555W WO2009041656A1 WO 2009041656 A1 WO2009041656 A1 WO 2009041656A1 JP 2008067555 W JP2008067555 W JP 2008067555W WO 2009041656 A1 WO2009041656 A1 WO 2009041656A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic recording
recording medium
vertical magnetic
magnetic
particles
Prior art date
Application number
PCT/JP2008/067555
Other languages
French (fr)
Japanese (ja)
Inventor
Kenji Ayama
Tokichiro Sato
Teiichiro Umezawa
Masafumi Ishiyama
Junichi Horikawa
Original Assignee
Hoya Corporation
Hoya Magnetics Singapore Pte. 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
Priority claimed from JP2008088117A external-priority patent/JP2009099241A/en
Priority claimed from JP2008088118A external-priority patent/JP2009099242A/en
Priority claimed from JP2008088119A external-priority patent/JP5261001B2/en
Application filed by Hoya Corporation, Hoya Magnetics Singapore Pte. Ltd filed Critical Hoya Corporation
Priority to US12/666,561 priority Critical patent/US8057926B2/en
Publication of WO2009041656A1 publication Critical patent/WO2009041656A1/en

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
    • G11B5/672—Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements
    • 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
    • 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
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • G11B5/7369—Two or more non-magnetic underlayers, e.g. seed layers or barrier 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
    • 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
    • G11B5/7368—Non-polymeric layer under the lowermost magnetic recording layer
    • G11B5/7369—Two or more non-magnetic underlayers, e.g. seed layers or barrier layers
    • G11B5/737—Physical structure of underlayer, e.g. texture
    • 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
    • G11B5/739—Magnetic recording media substrates
    • G11B5/73911—Inorganic substrates
    • G11B5/73921—Glass or ceramic substrates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

[PROBLEMS] To provide a vertical magnetic recording medium which can reduce a noise by further reducing the size of magnetic particles and isolating each of the particles in a magnetic recording layer and improve the SNR so as to increase the recording density. [MEANS FOR SOLVING PROBLEMS] A vertical magnetic recording medium (100) includes a magnetic recording layer (122) having a granular structure in which a non-magnetic particle boundary portion is formed between magnetic particles which have grown continuously in a columnar shape. The particle boundary portion contains a plurality of types of oxides.
PCT/JP2008/067555 2007-09-28 2008-09-26 Vertical magnetic recording medium WO2009041656A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/666,561 US8057926B2 (en) 2007-09-28 2008-09-26 Perpendicular magnetic recording medium

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP2007256913 2007-09-28
JP2007-256913 2007-09-28
JP2007-256911 2007-09-28
JP2007-256912 2007-09-28
JP2007256912 2007-09-28
JP2007256911 2007-09-28
JP2008088117A JP2009099241A (en) 2007-09-28 2008-03-28 Perpendicular magnetic recording medium
JP2008-088117 2008-03-28
JP2008-088118 2008-03-28
JP2008-088119 2008-03-28
JP2008088118A JP2009099242A (en) 2007-09-28 2008-03-28 Perpendicular magnetic recording medium
JP2008088119A JP5261001B2 (en) 2007-09-28 2008-03-28 Perpendicular magnetic recording medium

Publications (1)

Publication Number Publication Date
WO2009041656A1 true WO2009041656A1 (en) 2009-04-02

Family

ID=40511536

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/067555 WO2009041656A1 (en) 2007-09-28 2008-09-26 Vertical magnetic recording medium

Country Status (1)

Country Link
WO (1) WO2009041656A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011076693A (en) * 2009-10-01 2011-04-14 Wd Media Singapore Pte Ltd Perpendicular magnetic recording medium and method for manufacturing the same
US8722212B2 (en) 2009-03-19 2014-05-13 Showa Denko K.K. Magnetic recording medium with a non-magnetic granular layer under a plurality of granular magnetic layers and storage apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005100537A (en) * 2003-09-25 2005-04-14 Toshiba Corp Vertical magnetic recording medium and magnetic recording and reproducing device
JP2006164440A (en) * 2004-12-09 2006-06-22 Fuji Electric Device Technology Co Ltd Perpendicular magnetic recording medium and magnetic recording apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005100537A (en) * 2003-09-25 2005-04-14 Toshiba Corp Vertical magnetic recording medium and magnetic recording and reproducing device
JP2006164440A (en) * 2004-12-09 2006-06-22 Fuji Electric Device Technology Co Ltd Perpendicular magnetic recording medium and magnetic recording apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8722212B2 (en) 2009-03-19 2014-05-13 Showa Denko K.K. Magnetic recording medium with a non-magnetic granular layer under a plurality of granular magnetic layers and storage apparatus
JP2011076693A (en) * 2009-10-01 2011-04-14 Wd Media Singapore Pte Ltd Perpendicular magnetic recording medium and method for manufacturing the same

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