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Patent US5568115A successfully refreshed from Google Patents.
US5568115A
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Artificial lattice film and magneto-resistance effect element using the same
Assignee: Sony Corp
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Filing: 1994-12-15
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Granted: 1996-10-22
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Expires: 2014-12-15
Abstract
Abstract An artificial lattice film is constituted as a multilayered film in which magnetic layers containing Cu of 1˜50 atomic percentage and at least one component selected from Fe, Ni and Co and conductive layers are stacked one after another. By forming such an artificial lattice film on a non-magnetic substrate, a magneto-resistance effect element having excellent characteristic for use as magnetic head or magnetic sensor is provided.
Inventors
- 👤 Hiroshi Kano
- 👤 Atsuko Suzuki
- 👤 Kiyoshi Kagawa
- 👤 Akihiko Okabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:45
CPC Classifications
B; B82; B82Y; B82Y25/00; H; H01; H01F; H01F10/00; H01F10/32; H01F10/324; H10; H10N; H10N50/00; H10N50/80; H10N50/85
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A magneto-resistance effect element comprising: a non-magnetic substrate having a Young's modulus of 1.0×10 9 Nm -2 or more; and a sputtered artificial lattice film disposed on a surface of the substrate, said artificial lattice film having a multilayer structure of alternating magnetic layers and conductive layers, each said magnetic layer having a composition of the formula (Fe.sub.X Co.sub.y Ni.sub.z).sub.100-n Cu.sub.n wherein x, y, z and n are atomic percentages such that 10≦x≦25, 40≦y≦80, 10≦z≦40, x+y+z=100, and 1≦n≦50, and having a film thickness of about 1 nm, and each said conductive layer consisting of Cu or Cr and having a film thickness of from about 1.8 to about 2.8 nm, said magneto-resistance effect element having an MR ratio of at least about 4%.
Claim 2
Dependent Claim
123 words
A magneto-resistance effect element comprising: a non-magnetic substrate having a Young's modulus of 1.0×10 9 Nm -2 or more; and a sputtered artificial lattice film disposed on a surface of the substrate, said artificial lattice film having a multilayer structure of alternating magnetic layers and conductive layers, each said magnetic layer having a composition of the formula (Fe.sub.X Co.sub.y Ni.sub.z).sub.100-n Cu.sub.n wherein x, y, z and n are atomic percentages such that 10≦x≦25, 40≦y≦80, 10≦z≦40, x+y+z=100, and 1≦n≦50, and having a film thickness of about 1 nm, and each said conductive layer consisting of Cu or Cr and having a film thickness of from about 1.8 to about 2.8 nm, said magneto-resistance effect element having an MR ratio of at least about 4%.
Claim 3
Dependent Claim
56 words
A magneto-resistance effect element as defined in claim 1, wherein in the formula n has a value of greater than or equal to 5 and less than or equal to 25, and said magneto-resistance effect element has an MR ratio of at least about 7% and a coercive force Hc of about 10 Oe or less.
Claim 4
Dependent Claim
31 words
A magneto-resistance effect element as defined in claim 1, wherein each said magnetic layer comprises a composition of the formula (Fe.sub.20 Ni.sub.80).sub.90-m Co.sub.10 Cu.sub.m, wherein m is from 1 to 50.
Claim 5
Dependent Claim
31 words
A magneto-resistance effect element as defined in claim 1, wherein each said magnetic layer comprises a composition of the formula (Fe.sub.20 Ni.sub.55 CO.sub.35).sub.100-n Cu.sub.n, wherein n is from 1 to 50.
Claim 6
Dependent Claim
24 words
A magneto-resistance effect element as defined in claim 1, wherein said artificial lattice film contains about 30 magnetic layers and about 30 conductive layers.
Claim 7
Dependent Claim
30 words
A magneto-resistance effect element as defined in claim 1, wherein said non-magnetic substrate comprises a material selected from the group consisting of epoxy resin, nitrocellulose, Nylon 66 and polyethylene terephthalate.
Claim 8
Dependent Claim
20 words
A magneto-resistance effect element as defined in claim 1, wherein said artificial lattice film is sputtered by RF magnetron sputtering.
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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) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |