US 2008/0075978 A1 · CoPtCr-based bit patterned magnetic media

Abstract

A bit patterned magnetic recording medium comprises a substrate having a surface, and a plurality of spaced apart magnetic elements on the surface, each element constituting a discrete magnetic domain or bit of the same structure and comprised of a stack of thin film layers including in order from the substrate surface: a seed layer; and a perpendicular magnetic recording layer in contact with a surface of the seed layer and comprising a Co1-x-yPtxCry alloy material, where 0.05≦x≦0.35 and 0≦y≦0.15. The Co1-x-yPtxCry alloy material has a first order magnetic anisotropy constant K, up to about 2×107 erg/cm3, a saturation magnetization Ms up to about 1200 emu/cm3, an anisotropy field HK=2K1/Ms up to about 35 kOe, a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof, and an X-Ray diffraction (XRD) rocking curve with a full width at half maximum (FWHM) of ˜5° or less.

Claims20

Dependent claims

A bit patterned magnetic recording medium, comprising:

(a) a substrate having a surface;
and
(b) a plurality of spaced apart magnetic elements on said surface, each of said elements constituting a discrete magnetic domain or bit of the same structure and comprised of a stack of thin film layers, said stack including, in order from said substrate surface:
(i) a seed layer;
and
(ii) a perpendicular magnetic recording layer in contact with a surface of said seed layer and comprising a Co1-x-yPtxCry alloy material, where 0.05≦x≦0.35 and 0≦y≦0.15.

3 more elements

A method of fabricating a bit patterned magnetic recording medium, comprising steps of:

(a) providing a substrate having a surface;
and
(b) forming a plurality of spaced apart magnetic elements on said surface, each of said elements constituting a discrete magnetic domain or bit of the same structure and comprised of a stack of thin film layers, said stack including, in order from said substrate surface:
(i) a seed layer;
and
(ii) a perpendicular magnetic recording layer in contact with a surface of said seed layer and comprising a layer of a Co1-x-yPtxCry alloy material, where 0.05≦x≦0.35 and 0≦y≦0.15, said layer of Co1-x-yPtxCry alloy material having a first order magnetic anisotropy constant K1 up to about 2×107 erg/cm3, a saturation magnetization Ms up to about 1200 emu/cm3, an anisotropy field HK=2K1/Ms up to about 35 kOe, a hexagonal (0001) crystal structure with c-axis perpendicular to a surface thereof and an X-Ray diffraction (XRD) rocking curve with a full width at half maximum (FWHM) of ˜5° or less.

3 more elements

Dependencies are inferred from the claim text.

CoPtCr-based bit patterned magnetic media

Life of this patent

CoPtCr-based bit patterned magnetic media

Life of this patent

Abstract

Claims20