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Patent US4671828A successfully refreshed from Google Patents.
US4671828A
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Magnetic thin film
Assignee: Sony Corp
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Filing: 1985-04-05
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Granted: 1987-06-09
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Expires: 2005-04-05
Abstract
Abstract A magnetic thin film consisting essentially of Fe, Al and Si and further containing oxygen has high magnetic permeability and high hardness without lowering the magnetic properties such as saturation magnetic flux density or coercive force. The magnetic thin film has an increased specific resistivity and a lowered eddy current loss in the high frequency region and is suitable for a core material of magnetic transducer heads used in a high frequency region. The magnetic thin film is prepared by, for example, physical vapor deposition or ion implantation.
Inventors
- 👤 Kazushi Yamauchi
- 👤 Muneyuki Ogata
- 👤 Tomio Kobayashi
- 👤 Makoto Kubota
- 👤 Tatsuo Kumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:00
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0623; C23C30/00; G11B5/147; H01F10/12; H01F10/14; H01F10/142; H01F10/145; G11B5/3109; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d wherein a, b, c and d each represents a weight percent of the respective elements and satisfies the following relations of 70≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦5, a+b+c+d=100.
Claim 2
Dependent Claim
59 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d wherein a, b, c and d each represents a weight percent of the respective elements and satisfies the following relations of 70≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦5, a+b+c+d=100.
Claim 3
Dependent Claim
127 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d T e wherein T is at least one selected from the group consisting of IIIa group elements Sc, Y, La, Ce, Nd, or Gd, IVa group elements Ti, Zr or Hf, Va group elements V, Nb, or Ta, VIa group elements Cr, Mo or W, VIIa group elements Mn, Tc, or Re, Ib group elements, Cu, Ag, or Au or, Ga, In, Ge, Sn and Sb and a, b, c, d and e each represents a weight percent of the respective elements and satisfies the following relations of 65≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦10 a+b+c+d+e=100.
Claim 4
Dependent Claim
127 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d T e wherein T is at least one selected from the group consisting of IIIa group elements Sc, Y, La, Ce, Nd, or Gd, IVa group elements Ti, Zr or Hf, Va group elements V, Nb, or Ta, VIa group elements Cr, Mo or W, VIIa group elements Mn, Tc, or Re, Ib group elements, Cu, Ag, or Au or, Ga, In, Ge, Sn and Sb and a, b, c, d and e each represents a weight percent of the respective elements and satisfies the following relations of 65≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦10 a+b+c+d+e=100.
Claim 5
Dependent Claim
79 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d X e wherein X is at least one of platinium group elements Ru, Rh, Pd, Os, Ir, or Pt and a, b, c, d and e each represents a weight percent of the respective elements and satisfies the following relations of 65≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦40.
Claim 6
Dependent Claim
79 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d X e wherein X is at least one of platinium group elements Ru, Rh, Pd, Os, Ir, or Pt and a, b, c, d and e each represents a weight percent of the respective elements and satisfies the following relations of 65≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦40.
Claim 7
Dependent Claim
147 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d T e X f wherein T is at least one selected from the group consisting of IIIa group elements Sc, Y, La, Ce, Nd, or Gd, IVa group elements Ti, Zr, or Hf, Va group elements V, Nb, or Ta, VIa group elements Cr, Mo, or W, VIIa group elements Mn, Tc, or Re, Ib group elements Cu, Ag or Au, Ga, In, Ge, Sn and Sb and X is at least one of platinum group elements Ru, Rh, Pd, Os, Ir, or Pt and a, b, c, d, e and f each represents a weight percent of the respective elements and satisfies the following relations of 55≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦10 0≦f≦40 a+b+c+d+e+f=100.
Claim 8
Dependent Claim
147 words
A magnetic thin film having a thickness of more than 10 Angstroms and less than 100 microns and a composition represented by the following formula: Fe a Al b Si c O d T e X f wherein T is at least one selected from the group consisting of IIIa group elements Sc, Y, La, Ce, Nd, or Gd, IVa group elements Ti, Zr, or Hf, Va group elements V, Nb, or Ta, VIa group elements Cr, Mo, or W, VIIa group elements Mn, Tc, or Re, Ib group elements Cu, Ag or Au, Ga, In, Ge, Sn and Sb and X is at least one of platinum group elements Ru, Rh, Pd, Os, Ir, or Pt and a, b, c, d, e and f each represents a weight percent of the respective elements and satisfies the following relations of 55≦a<95 2≦b≦10 4≦c≦15 0.1≦d≦6 0≦e≦10 0≦f≦40 a+b+c+d+e+f=100.
Claim 9
Dependent Claim
29 words
A magnetic thin film according to claim 4, wherein said e and f satisfy the relation of e+f≦20 when Ru, Rh or Pd is used for platinum group elements.
Claim 10
Dependent Claim
29 words
A magnetic thin film according to claim 4, wherein said e and f satisfy the relation of e+f≦40 when Os, Ir or Pt is used for platinum group elements.
Claim 11
Dependent Claim
24 words
A magnetic thin film according to any one of claims 1 to 5, wherein a part of Fe is substituted by Co or Ni.
Claim 12
Dependent Claim
28 words
A magnetic thin film according to claim 6, wherein a ratio of substitution by Co is in the range of 0 to 60 weight percent related to Fe.
Claim 13
Dependent Claim
28 words
A magnetic thin film according to claim 6, wherein a ratio of substitution by Ni is in the range of 0 to 40 weight percent related to Fe.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |