Magnetic alloy and magnetic recording medium and method for preparation thereof, and target for forming magnetic film and magnetic recording device
AssigneesMigaku Takahashi, Fuji Electric Co., Ltd., Showa Denko K.K.
InventorMigaku Takahashi
Life of this patent
Estimating the term…
Abstract
The magnetic alloy includes cobalt (Co), chromium (Cr), and germanium (Ge), the composition of the magnetic alloy being represented by the general formula: CoxCryGez where x, y and z, which represent the composition ratio in terms of atomic %, satisfy the relationships: 78≦x≦87, 2.5≦y≦14.5, 3.5≦z≦15 and x+y+z=100. The magnetic alloy may have a composition represented by the formulas: CoCrGeT (T represents one or more elements of Ta, Si, Nb, B, Ni and Pt) or a composition represented by the formula: CoCrGeT′ (T′ represents one or more elements of Ta, B, and Pt).
Claims20
A magnetic alloy consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), platinum (Pt), and an element T′ (T′ represents one or more of the elements Ta and B),
- a composition of said magnetic alloy being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦25, 2≦z≦15, 2≦v≦25, and 1≦c′≦12.
A magnetic recording medium comprising a substrate and a ferromagnetic metal magnetic film formed on said substrate via a metallic underlayer,
- said ferromagnetic metal magnetic film being a magnetic film consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), platinum (Pt), and an element T′ (T′ represents one or more elements of Ta and B),
- a composition of said magnetic alloy being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦25, 2≦z≦15, 2≦v≦25, and 1≦c′≦12.
A target for forming a magnetic film, consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), and an element T′ (T′ represents one or more elements of Ta and B),
- a composition of said target being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦25, 2≦z≦15, 2≦v≦25, and 1≦c′≦12.
A magnetic alloy consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), platinum (Pt), and an element T′ (T′ represents one or more of the elements Ta and B),
- a composition of said magnetic alloy being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦14.5, 3.5≦z≦15, 2≦v≦25, and 1≦c′≦12.
A magnetic recording medium comprising a substrate and a ferromagnetic metal magnetic film formed on said substrate via a metallic underlayer,
- said ferromagnetic metal magnetic film being a magnetic film consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), platinum (Pt), and an element T′ (T′ represents one or more elements of Ta and B),
- a composition of said magnetic alloy being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦14.5, 3.5≦z≦15, 2≦v≦25, and 1≦c′≦12.
A target for forming a magnetic film, consisting essentially of cobalt (Co), chromium (Cr), germanium (Ge), and an element T′ (T′ represents one or more elements of Ta and B),
- a composition of said target being represented by the general formula:
- (CoxCryGezPtv)100−c′T′c′
- where x, y, z, v, and c′, which represent a composition ratio in terms of atomic %, satisfy the relationships:
- 45≦x≦87, 2.5≦y≦14.5, 3.5≦z≦15, 2≦v≦25, and 1≦c′≦12.
Dependencies are inferred from the claim text.