Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-03-08
2005-03-08
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S690000, C428S690000, C428S900000, C427S192000
Reexamination Certificate
active
06863998
ABSTRACT:
A magnetic recording medium100comprises, on a substrate1, a first orientation control layer2, a second orientation control layer4, a soft magnetic layer6, a non-magnetic layer8, a recording layer12, and a carbon protective layer14. The recording layer12is formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePt3ordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePt3ordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer12.
REFERENCES:
patent: 6033536 (2000-03-01), Ichihara et al.
patent: 6555252 (2003-04-01), Sellmyer et al.
patent: 6630255 (2003-10-01), Litvinov et al.
patent: A 9-320847 (1997-12-01), None
patent: A 11-353648 (1999-12-01), None
patent: A 2001-056931 (2001-02-01), None
patent: A 2001-101645 (2001-04-01), None
patent: A 2001-176048 (2001-06-01), None
patent: A 2001-283419 (2001-10-01), None
patent: A 2002-123920 (2002-04-01), None
patent: A 2003-006830 (2003-01-01), None
Hu et al., “Kerr Effect of Ordered and Disordered Fe1-xPtx(001) Alloy Films”, Jul. 2001, IEEE Trans Magn, vol. 37, No. 4, pp. 2417-2419.*
International Preliminary Examination Report (IPER) from PCT/JP2002/012648.
Inaba et al.,“Effects of Pt and Ta addition on compositional microstructure of CoCr-alloy thin film media”, Journal of Applied Physics, vol. 87, No. 9, pp. 6863-6865, 2000.
Chen et al., “Long-range atomic ordering and magnetic properties of Co1-xPtx/SiO2granular films”, Journal of Applied Physics, vol. 87, No. 9, pp. 6947-6949, 2000.
Fujita Enji
Inaba Nobuyuki
Koda Tetsunori
Matsunuma Satoshi
Yamanaka Hideaki
Hitachi Maxell Ltd.
Rickman Holly
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