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Metallic glass, magnetic recording medium using the same, and method of manufacturing the magnetic recording medium

外国特許コード F110003540
整理番号 B37-06WO
掲載日 2011年6月29日
出願国 アメリカ合衆国
出願番号 67829108
公報番号 20100310901
公報番号 8377580
出願日 平成20年9月17日(2008.9.17)
公報発行日 平成22年12月9日(2010.12.9)
公報発行日 平成25年2月19日(2013.2.19)
国際出願番号 JP2008066793
国際公開番号 WO2009038105
国際出願日 平成20年9月17日(2008.9.17)
国際公開日 平成21年3月26日(2009.3.26)
優先権データ
  • 特願2007-241595 (2007.9.18) JP
  • 2008JP066793 (2008.9.17) WO
発明の名称 (英語) Metallic glass, magnetic recording medium using the same, and method of manufacturing the magnetic recording medium
発明の概要(英語) A magnetic recording medium 1 includes a substrate 11; and a metallic glassy layer 12 that is arranged on the substrate 11 and has a plurality of convex portions 12A and concave portions 12B.
The metallic glassy layer 12 has a chemical composition represented by any one of the formulae (1) to (3): FemPtnSixByPz (wherein, 20<m≰60 at %, 20<n≰55 at %, 11≰x<19 at %, 0≰y<8 at %, and 0<z<8 at %) (1); Fe55Pt25(SixByPz)20 (wherein, 11≰x<19 at %, 0≰y<8 at %, and 0<z<8 at %) (2); and (Fe0.55Pt0.25Si0.16B0.02P0.02)100-xMx (wherein 0<X≰6 at %; and M represents an element or a combination of an two or more of the elements selected from Zr, Nb, Ta, Hf, Ti, Mo, W, V, Cr, Mn, Al, Y, Ag, and rare earth elements.) (3).
従来技術、競合技術の概要(英語) BACKGROUND ART
With the development of advanced information society in recent years, the need for larger capacity image information recording is increasing, and a surface recording density as high as 1 Terabit per square inch (Tb/inch2) is required for magnetic recording media.
As a magnetic recording medium providing such high recording density, a patterned magnetic recording medium, which isolates magnetic dots using a nonmagnetic material, has been a focus of attention (See Non-patent Reference 1.).
The technique described in Non-patent Reference 1 uses a mask on which resist is patterned by the nanoimprint technology, and isolates magnetic dots by etching a magnetic film using this mask.
It is known that a rapidly quenched Fe-Pt-B alloy ribbon has a double-phase structure consisting of a uniform nanosized amorphous phase and a fcc(gamma )-FePt phase, and that structure transforms into a nanostructure exhibiting good hard magnetic property by heat treatment (See Non-patent Reference 2.).
[Non-patent Reference 1] Tsutomu AOYAMA, Isamu SATO, Shunji ISHIO, "Fabrication and magnetic properties of patterned magnetic recording media", OYO BUTURI, 2003, Vol. 72, No. 3, pp. 298-303
[Non-patent Reference 2] A. Inoue and W. Zhang, J. Appl. Phys., 97, 10H308, 2005

特許請求の範囲(英語) [claim1]
1. A magnetic recording medium characterized in that said magnetic recording medium comprising: a substrate; and
a metallic glassy layer, which is formed on the substrate and has a plurality of concave portions and convex portions,
the metallic glassy layer is made of a metallic glass having a chemical composition represented by the formula (1),
the plurality of concave portions are consisting of a soft magnetic layer, and
the plurality of convex portions are consisting of a hard magnetic layer,
FemPtnSixByPz (wherein, 20<m <= 60 at %, 20<n <= 55 at %, 11 <= x<19 at %, 0 <= y<8 at %, and 0<z<8 at %) (1).
[claim2]
2. The magnetic recording medium as set forth in claim 1, characterized in that the chemical composition is represented by the formula (2),
Fe55Pt25(SixByPz)20 (wherein, 11 <= x<19 at %, 0 <= y<8 at %, and 0<z<8 at %) (2).
[claim3]
3. A magnetic recording medium characterized in that it comprising: a substrate; and
a metallic glassy layer, which is formed on the substrate and has a plurality of concave portions and convex portions, wherein,
the metallic glassy layer is made of a metallic glass having a chemical composition represented by the formula (3),
the plurality of concave portions are consisting of a soft magnetic layer, and
the plurality of convex portions are consisting of a hard magnetic layer,
(Fe0.55Pt0.25Si0.16B0.02P0.02)100-xMx (wherein, 0<X <= 6 at %; and M represents an element or a combination of any two of more of the elements selected from Zr, Nb, Ta, Hf, Ti, Mo, W, V, Cr, Mn, Al, Y, Ag, and rare earth elements (3).
[claim4]
4. The magnetic recording medium as set forth in any one of claims 1 to 3, characterized in that the convex portions have a surface protective layer covered with a non-magnetic material.
[claim5]
5. The magnetic recording medium as set forth in any one of claims 1 to 3, characterized in that the concave portions and convex portions are arranged in a matrix, houndstooth-check, or line sequence pattern.
[claim6]
6. The magnetic recording medium as set forth in claim 3, characterized in that the M represents Zr.
[claim7]
7. The magnetic recording medium as set forth in any one of claims 1 to 3, characterized in that a part of Fe is substituted by Co or Ni.
[claim8]
8. The magnetic recording medium as set forth in any one of claims 1 to 3, characterized in that a part of Pt is substituted by Pd.
  • 発明者/出願人(英語)
  • MAKINO AKIHIRO
  • INOUE AKIHISA
  • ZHANG WEI
  • KIMURA HISAMICHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
国際特許分類(IPC)
米国特許分類/主・副
  • 428/836.3
  • 428/826
  • 428/836
  • 428/836.1
参考情報 (研究プロジェクト等) SORST Selected in Fiscal 2002
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