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US4416709A
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Amorphous magnetic alloy material
Assignee: TDK Corp
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Filing: 1981-09-10
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Granted: 1983-11-22
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Expires: 2001-09-10
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 inconveniences 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
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:24
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: 15
Claim 1
Independent Claim
159 words
An amorphous magnetic alloy material having a high resistance against deterioration when stored for a long period of time at a high temperature and high humidity and having a high wear resistance, wherein said amorphous magnetic alloy material is expressed by the formula: (Fe.sub.p Co.sub.q Ni.sub.r).sub.a Mb.sup.(1) Cr.sub.c M.sub.d.sup.(2) X.sub.e wherein M.sup.(1) is ruthenium alone or combined with at least one platinum family element selected from the group consisting of palladium, platinum, iridium, and rhodium, M.sup.(2) is at least one transition metal element other than iron, cobalt, nickel, ruthenium, palladium, platinum, iridium, rhodium, and chromium, and X is at least one vitrification element with the proviso that the parameters p, q, r, a, b, c, d, and e fulfill the following relationships: p+q+r=100%, p=about 4% to 7%; r=0% to about 10%, a+b+c+d+e=100 atomic %; b=about 0.01 to 8 atomic %; c=about 0.5 to 8 atomic %; d=0 to about 4 atomic %; and e=20 to about 26 atomic %.
Claim 2
Dependent Claim
159 words
An amorphous magnetic alloy material having a high resistance against deterioration when stored for a long period of time at a high temperature and high humidity and having a high wear resistance, wherein said amorphous magnetic alloy material is expressed by the formula: (Fe.sub.p Co.sub.q Ni.sub.r).sub.a Mb.sup.(1) Cr.sub.c M.sub.d.sup.(2) X.sub.e wherein M.sup.(1) is ruthenium alone or combined with at least one platinum family element selected from the group consisting of palladium, platinum, iridium, and rhodium, M.sup.(2) is at least one transition metal element other than iron, cobalt, nickel, ruthenium, palladium, platinum, iridium, rhodium, and chromium, and X is at least one vitrification element with the proviso that the parameters p, q, r, a, b, c, d, and e fulfill the following relationships: p+q+r=100%, p=about 4% to 7%; r=0% to about 10%, a+b+c+d+e=100 atomic %; b=about 0.01 to 8 atomic %; c=about 0.5 to 8 atomic %; d=0 to about 4 atomic %; and e=20 to about 26 atomic %.
Claim 3
Dependent Claim
24 words
The amorphous magnetic alloy material according to claim 1, wherein said platinum family element is selected from the group consisting of, iridium and rhodium.
Claim 4
Dependent Claim
14 words
The amorphous magnetic alloy material according to claim 1, wherein M.sup.(1) is ruthenium alone.
Claim 5
Dependent Claim
35 words
The amorphous magnetic alloy material according to claim 1, wherein said vitrification element is at least o ne selected from the group consisting of silicon, boron, phosphorus, carbon, germanium, tin, gallium, indium, antimony, and aluminum.
Claim 6
Dependent Claim
50 words
The amorphous magnetic alloy material according to claim 4, wherein said vitrification element is expressed by the formula of Si k BX m .sup.(1), wherein k+l+m=100, k=5% to 20% m=0 to 20%, and X.sup.(1) is at least one element selected from the group consisting of phosphorus, germanium, tin, and carbon.
Claim 7
Dependent Claim
49 words
The amorphous magnetic alloy material according to claim 1, 4, or 5, further containing at least one Group IV B element, at least one Group V B element, and at least one Group VI B element, except for chromium, in an amount of from 0.05 to 4 atomic %.
Claim 8
Dependent Claim
29 words
The amorphous magnetic alloy material according to claim 6, wherein said Group IV B element is at least one selected from the group consisting of titanium, zirconium, and hafnium.
Claim 9
Dependent Claim
17 words
The amorphous magnetic alloy material according to claim 7, wherein said Group IV B element is titanium.
Claim 10
Dependent Claim
29 words
The amorphous magnetic alloy material according to claim 7, wherein said Group V B element is at least one selected from the group consisting of vanadium, niobium, and tantalum.
Claim 11
Dependent Claim
17 words
The amorphous magnetic alloy material according to claim 9, wherein said Group V B element is vanadium.
Claim 12
Dependent Claim
28 words
The amorphous magnetic alloy material according to claim 6, wherein said Group V B element is at least one selected from the group consisting of molybdenum and tungsten.
Claim 13
Dependent Claim
17 words
The amorphous magnetic alloy material according to claim 11, wherein said Group V B element is molybdenum.
Claim 14
Dependent Claim
175 words
A magnetic head having excellent resistance to chemical and mechanical wear comprising a core consisting of an amorphous magnetic alloy material having a high resistance against deterioration when stored for a long period of time at a high temperature and high humidity and having a high wear resistance wherein said amorphous magnetic alloy material is expressed by the formula: (Fe.sub.p Co.sub.q Ni.sub.r).sub.a M.sub.b.sup.(1) Cr.sub.c M.sub.d.sup.(2) X.sub.e wherein M.sup.(1) is ruthenium alone or combined with at least one platinum family element selected from the group consisting of palladium, platinum, iridium, and rhodium, M.sup.(2) is at least one transition metal element other than iron, cobalt, nickel, ruthenium, palladium, platinum, iridium, rhodium, and chromium, and X is at least one vitrification element, with the proviso that the parameters p, q, r, a, b, c, d, and e fulfill the following relationships: p+q+r=100%; p=about 4% to 7%; r+0% to about 10%; a+b+c+d+e=100 atomic %; b=about 0.01 to 8 atomic %; c=about 0.5 to 8 atomic %; d=0 to about 4 atomic %; and e=20 to about 26 atomic %.
Claim 15
Dependent Claim
175 words
A magnetic head having excellent resistance to chemical and mechanical wear comprising a core consisting of an amorphous magnetic alloy material having a high resistance against deterioration when stored for a long period of time at a high temperature and high humidity and having a high wear resistance wherein said amorphous magnetic alloy material is expressed by the formula: (Fe.sub.p Co.sub.q Ni.sub.r).sub.a M.sub.b.sup.(1) Cr.sub.c M.sub.d.sup.(2) X.sub.e wherein M.sup.(1) is ruthenium alone or combined with at least one platinum family element selected from the group consisting of palladium, platinum, iridium, and rhodium, M.sup.(2) is at least one transition metal element other than iron, cobalt, nickel, ruthenium, palladium, platinum, iridium, rhodium, and chromium, and X is at least one vitrification element, with the proviso that the parameters p, q, r, a, b, c, d, and e fulfill the following relationships: p+q+r=100%; p=about 4% to 7%; r+0% to about 10%; a+b+c+d+e=100 atomic %; b=about 0.01 to 8 atomic %; c=about 0.5 to 8 atomic %; d=0 to about 4 atomic %; and e=20 to about 26 atomic %.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |