AU2001240880A1 - Magnetic recording medium - Google Patents

Magnetic recording medium

Info

Publication number
AU2001240880A1
AU2001240880A1 AU2001240880A AU4088001A AU2001240880A1 AU 2001240880 A1 AU2001240880 A1 AU 2001240880A1 AU 2001240880 A AU2001240880 A AU 2001240880A AU 4088001 A AU4088001 A AU 4088001A AU 2001240880 A1 AU2001240880 A1 AU 2001240880A1
Authority
AU
Australia
Prior art keywords
layer
magnetic recording
host
magnetic
recording layer
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.)
Abandoned
Application number
AU2001240880A
Inventor
David Thomas Margulies
Ernesto Esteban Marinero
Manfred Ernst Schabes
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.)
International Business Machines Corp
Original Assignee
International Business Machines 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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of AU2001240880A1 publication Critical patent/AU2001240880A1/en
Abandoned 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
    • G11B5/676—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 magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer
    • G11B5/678—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 magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer having three or more magnetic 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature

Landscapes

  • Magnetic Record Carriers (AREA)
  • Thin Magnetic Films (AREA)
  • Liquid Crystal (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

A magnetic recording disk has a magnetic recording layer formed on a special multilayered "host" layer. The host layer is a "synthetic antiferromagnetically", i.e., at least two ferromagnetic films that are exchange-coupled antiferromagnetically (AF) to one another across a nonferromagnetic spacer film so that their magnetic moments are oriented antiparallel. The magnetic recording layer has a different composition from the top ferromagnetic film in the host layer and is ferromagnetically coupled to the top ferromagnetic film of the host layer. The magnetic volume V of the composite structure (magnetic recording layer and host layer) that determines the thermal stability will be approximately the sum of the volumes of the grains in the magnetic recording layer and the AF-coupled ferromagnetic films of the host layer. However, the magnetic moment of the composite structure is primarily just the moment from the magnetic recording layer because the host layer is designed to have essentially no net magnetic moment.
AU2001240880A 2000-03-27 2001-03-19 Magnetic recording medium Abandoned AU2001240880A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/536,868 US6383668B1 (en) 2000-03-27 2000-03-27 Magnetic recording media with antiferromagnetically coupled host layer for the magnetic recording layer
US09536868 2000-03-27
PCT/GB2001/001180 WO2001073762A2 (en) 2000-03-27 2001-03-19 Magnetic recording medium

Publications (1)

Publication Number Publication Date
AU2001240880A1 true AU2001240880A1 (en) 2001-10-08

Family

ID=24140247

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001240880A Abandoned AU2001240880A1 (en) 2000-03-27 2001-03-19 Magnetic recording medium

Country Status (12)

Country Link
US (1) US6383668B1 (en)
EP (1) EP1275110B1 (en)
JP (1) JP3836373B2 (en)
KR (1) KR100469531B1 (en)
CN (1) CN100373458C (en)
AT (1) ATE347164T1 (en)
AU (1) AU2001240880A1 (en)
CA (1) CA2398950A1 (en)
DE (1) DE60124888T2 (en)
MY (1) MY119063A (en)
TW (1) TW509919B (en)
WO (1) WO2001073762A2 (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6773834B2 (en) * 1999-10-08 2004-08-10 Hitachi Global Storage Technologies Netherlands B.V. Laminated magnetic recording media with antiferromagnetically coupled layer as one of the individual magnetic layers in the laminate
JP3350512B2 (en) * 2000-05-23 2002-11-25 株式会社日立製作所 Perpendicular magnetic recording medium and magnetic recording / reproducing device
US6759149B1 (en) * 2000-07-25 2004-07-06 Seagate Technology Llc Laminated medium with antiferromagnetic stabilization layers
JP3848072B2 (en) * 2000-09-29 2006-11-22 富士通株式会社 Magnetic recording medium and magnetic storage device using the same
DE60042988D1 (en) * 2000-11-29 2009-10-29 Fujitsu Ltd Magnetic recording medium and magnetic storage device
JP2002279618A (en) * 2001-03-19 2002-09-27 Hitachi Ltd Magnetic recording medium
EP1406247B1 (en) * 2001-05-23 2009-03-25 Fujitsu Limited Vertical recording type magnetic recording medilim and magnetic memory device using the medium
JP4072324B2 (en) * 2001-06-26 2008-04-09 株式会社日立グローバルストレージテクノロジーズ Magnetic recording medium and method for manufacturing the same
JP4746778B2 (en) * 2001-06-28 2011-08-10 株式会社日立グローバルストレージテクノロジーズ Magnetic recording medium and magnetic storage device using the same
SG108859A1 (en) * 2001-07-03 2005-02-28 Hoya Corp Magnetic recording medium
SG96659A1 (en) * 2001-11-08 2003-06-16 Inst Data Storage Laminated antiferromagnetically coupled media for data storage
JP2003162813A (en) * 2001-11-28 2003-06-06 Hitachi Ltd Magnetic recording medium and magnetic storage device
US6852426B1 (en) * 2001-12-20 2005-02-08 Seagate Technology Llc Hybrid anti-ferromagnetically coupled and laminated magnetic media
JP2005521980A (en) * 2002-03-29 2005-07-21 富士通株式会社 Magnetic recording medium and magnetic storage device
US6811890B1 (en) 2002-04-08 2004-11-02 Maxtor Corporation Intermediate layer for antiferromagnetically exchange coupled media
US6878460B1 (en) 2002-11-07 2005-04-12 Seagate Technology Llc Thin-film magnetic recording media with dual intermediate layer structure for increased coercivity
US20040166371A1 (en) * 2003-02-26 2004-08-26 Berger Andreas Klaus Dieter Magnetic recording media with write-assist layer
US6835476B2 (en) * 2003-03-11 2004-12-28 Hitachi Global Storage Technologies Netherlands B.V. Antiferromagnetically coupled magnetic recording media with CoCrFe alloy first ferromagnetic film
US6964819B1 (en) * 2003-05-06 2005-11-15 Seagate Technology Llc Anti-ferromagnetically coupled recording media with enhanced RKKY coupling
US7592079B1 (en) 2003-07-03 2009-09-22 Seagate Technology Llc Method to improve remanence-squareness-thickness-product and coercivity profiles in magnetic media
US7201977B2 (en) * 2004-03-23 2007-04-10 Seagate Technology Llc Anti-ferromagnetically coupled granular-continuous magnetic recording media
JP2006185489A (en) * 2004-12-27 2006-07-13 Fujitsu Ltd Magnetic recording medium and magnetic storage device
US7556870B2 (en) * 2005-08-15 2009-07-07 Hitachi Global Storage Technologies Netherlands B.V. Antiferromagnetically coupled media for magnetic recording with weak coupling layer
US9978413B2 (en) 2006-06-17 2018-05-22 Dieter Suess Multilayer exchange spring recording media
US8580580B2 (en) 2010-04-01 2013-11-12 Seagate Technology Llc Magnetic element with varying areal extents

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5815342A (en) * 1992-07-13 1998-09-29 Kabushiki Kaisha Toshiba Perpendicular magnetic recording/reproducing apparatus
JPH06103553A (en) * 1992-09-18 1994-04-15 Fujitsu Ltd Perpendicular magnetic recording medium and its production
US5569533A (en) * 1994-03-14 1996-10-29 Hmt Technology Corporation Thin-film medium with sublayer
US5583725A (en) * 1994-06-15 1996-12-10 International Business Machines Corporation Spin valve magnetoresistive sensor with self-pinned laminated layer and magnetic recording system using the sensor
US5843589A (en) * 1995-12-21 1998-12-01 Hitachi, Ltd. Magnetic layered material, and magnetic sensor and magnetic storage/read system based thereon
EP1577275B1 (en) * 1998-03-13 2008-12-17 Hoya Corporation Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass
US6307708B1 (en) * 1998-03-17 2001-10-23 Kabushiki Kaisha Toshiba Exchange coupling film having a plurality of local magnetic regions, magnetic sensor having the exchange coupling film, and magnetic head having the same
JP4263802B2 (en) * 1998-03-17 2009-05-13 株式会社東芝 Magnetic core, magnetic sensor, and magnetic recording head
JPH11296832A (en) * 1998-04-02 1999-10-29 Sony Corp Magnetic recording medium
EP1302931A1 (en) * 1999-06-08 2003-04-16 Fujitsu Limited Magnetic recording medium
US6280813B1 (en) * 1999-10-08 2001-08-28 International Business Machines Corporation Magnetic recording media with antiferromagnetically coupled ferromagnetic films as the recording layer

Also Published As

Publication number Publication date
MY119063A (en) 2005-03-31
EP1275110A2 (en) 2003-01-15
US6383668B1 (en) 2002-05-07
CN100373458C (en) 2008-03-05
ATE347164T1 (en) 2006-12-15
EP1275110B1 (en) 2006-11-29
JP3836373B2 (en) 2006-10-25
JP2003529174A (en) 2003-09-30
DE60124888D1 (en) 2007-01-11
KR20020084220A (en) 2002-11-04
TW509919B (en) 2002-11-11
KR100469531B1 (en) 2005-02-02
DE60124888T2 (en) 2007-09-27
WO2001073762A3 (en) 2002-04-04
CN1419688A (en) 2003-05-21
CA2398950A1 (en) 2001-10-04
WO2001073762A2 (en) 2001-10-04

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