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

Foreign code F110003540
File No. B37-06WO
Posted date Jun 29, 2011
Country United States of America
Application number 67829108
Gazette No. 20100310901
Gazette No. 8377580
Date of filing Sep 17, 2008
Gazette Date Dec 9, 2010
Gazette Date Feb 19, 2013
International application number JP2008066793
International publication number WO2009038105
Date of international filing Sep 17, 2008
Date of international publication Mar 26, 2009
Priority data
  • P2007-241595 (Sep 18, 2007) JP
  • 2008WO-JP66793 (Sep 17, 2008) WO
Title Metallic glass, magnetic recording medium using the same, and method of manufacturing the magnetic recording medium
Abstract (US8377580)
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).
Scope of claims [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.
  • Inventor, and Inventor/Applicant
  • MAKINO AKIHIRO
  • INOUE AKIHISA
  • ZHANG WEI
  • KIMURA HISAMICHI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) SORST Selected in Fiscal 2002
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