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EP0048888A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Amorphous magnetic alloy material

Assignee: TDK Corp
•
Filing: 1981-09-15
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Granted: —
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Expires: 2001-09-15
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Abstract

Abstract The present invention relates to an amorphous magnetic alloy material suited for use as a core material of a magnetic head. When the magnetic head is subjected to a slide contact with a magnetic tape over a long period of time, a film of oxide and the like is formed on the surface of an amorphous magnetic alloy material due to chemically corrosive media frequently contained in the magnetic coating layer of the magnetic tape or due to carbon dioxide, water and the like contained in the air. The amorphous magnetic alloy material of the present invention is highly corrosion resistant due to the combination of chromium and platinum family element(s), and, the inconveniencies in a magnetic head, due to chemical wear, can be prevented even where the magnetic head is operated or stored in a considerably severe condition.

Inventors

  • 👤 Kazuo Ohya
  • 👤 Hiroki Fujishima
  • 👤 Norio Ishijima
  • 👤 Hiroyoshi Itoga
  • 👤 Yasuhiko Kominami

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 22:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; C; C22; C22C; C22C45/00; C22C45/04; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15316

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 71 words
CLAIMS 1. An amorphous magnetic alloy material, characterized in that said material contains at least iron and cobalt as the iron family elements, the quantity of iron in terms of atomic proportion based on the iron family element being from about 4 to 7%, and further contains from about 0.01% to 8 atomic % of at least one platinum family element and from about 0.5 to 8 atomic % of chromium.
Claim 2
Dependent Claim 45 words
An amorphous magnetic alloy material according to claim 1, wherein said at least one platinum family element is selected from the group consisting of ruthenium, palladium, platinum, iridium and rhodium, and preferably said at least one platinum family element includes ruthenium or is ruthenium alone.
Claim 3
Dependent Claim 50 words
An amorphous magnetic alloy material according to claim 6, wherein at least one vitrification element selected from the group consisting of silicon, boron, phosphorus, carbon, germanium, tin, gallium, indium, antimony and aluminum is contained in the amorphous alloy and has a content of from about 20 to 26 atomic %.
Claim 4
Dependent Claim 58 words
An amorphous magnetic alloy material according to claim 3, wherein said vitrification element is expressed by the formula of Si k B ℓ X (1) m , wherein, k+l+m=100, k=5 to 20% and m= 0 to 20 % , and X (1) is at least one element selected from the group consisting of phosphorus, germanium, tin and carbon.
Claim 5
Dependent Claim 50 words
An amorphous magnetic alloy material according to one of claims 1 through 9, said mateiral further contains, at least one of the IV B family element, the V B family element and the VI B family element except for chromium, in an amount of from 0.05 to 4 atomic %.
Claim 6
Dependent Claim 33 words
An amorphous magnetic alloy material according to claim 5, wherein said IV B family element is at least one selected from the group consisting of titanium, zirconium and hafnium, and is preferably titanium.
Claim 7
Dependent Claim 32 words
An amorphous magnetic alloy material according to claim 5, wherein said V B family element is at least one selected from the group consisting of vanadium, niobium, tautalum, and is preferably vanadium.
Claim 8
Dependent Claim 32 words
An amorphous magnetic alloy material according to claim 5, wherein said V B family element is at least one selected from the group consisting of molybdenum and tungsten, and is preferably molybdenum.
Claim 9
Dependent Claim 23 words
Use of an amorphous magnetic alloy material according to claim 1, 11, 12 or 13, for the constituent material of a magnetic head.

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