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US4452857A Expired / Lapsed US ⏱️ 0.0 years remaining

Magnetic medium

Assignee: Semiconductor Energy Laboratory Co Ltd
•
Filing: 1983-09-22
•
Granted: 1984-06-05
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Expires: 2003-09-22
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Abstract

Abstract A base member is disposed in a reaction chamber and a raw material gas is introduced thereinto which contains at least a compound gas of a first magnetic material, or the compound gas of the first magnetic material and an oxidizing or nitriding gas, or the compound gas of the first magnetic material and a compound gas of a second magnetic material. A plasma generating electrical energy is applied to the raw material gas to obtain therein a stream of plasma of the raw material gas, by which a stream of active reaction products is passed over the base member. As a result of this, the first magnetic material, an oxide or nitride of the first magnetic material, or a magnetic material containing the first and second magnetic materials is deposited on the base member, forming thereon a magnetic material layer which consists principally of the first magnetic material, the oxide or nitride of the first magnetic material, or the magnetic material containing the first and second materials.

Inventors

  • 👤 Shunpei Yamazaki

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 00:23
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; G11B5/657; G11B5/658; G11B5/84; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/13; H01F41/00; H01F41/14; H01F41/22; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31678

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 36 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous particles of a magnetic material selected from a group consisting of Fe, Ni, and Co.
Claim 2
Dependent Claim 36 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous particles of a magnetic material selected from a group consisting of Fe, Ni, and Co.
Claim 3
Dependent Claim 38 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous particles of nitride of a magnetic material selected from a group consisting of Fe, Ni and Co.
Claim 4
Dependent Claim 38 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous particles of nitride of a magnetic material selected from a group consisting of Fe, Ni and Co.
Claim 5
Dependent Claim 58 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous of a magnetic material mixture or alloy containing a first magnetic material selected from a group consisting of Fe, Ni, or Co and a second magnetic material selected from the remaining two of Fe, Ni and Co.
Claim 6
Dependent Claim 58 words
A magnetic medium comprising: a base member; and a magnetic material layer formed thereon and composed principally of amorphous or semi-amorphous of a magnetic material mixture or alloy containing a first magnetic material selected from a group consisting of Fe, Ni, or Co and a second magnetic material selected from the remaining two of Fe, Ni and Co.
Claim 7
Dependent Claim 33 words
A magnetic medium according to one of claims 1 to 3, wherein the amorphous or semi-amorphous particles are columnarshaped and diposited on the base member in a direction vertical to the surface thereof.
Claim 8
Dependent Claim 33 words
A magnetic medium according to one of claims 1 to 3, wherein the amorphous or semi-amorphous particles are acicularshaped and deposited on the base member in a direction lateral to the surface thereof.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-06-05 1987-12-05 1988-06-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-06-05 1991-12-05 1992-06-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-06-05 1995-12-05 1996-06-05 $7700.00 Window Closed / Lapsed

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