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US5700593A
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Metal thin film magnetic recording medium and manufacturing method thereof
Assignee: United Module Corp
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Filing: 1994-03-07
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Granted: 1997-12-23
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Expires: 2014-03-07
Abstract
Abstract A metal thin film magnetic recording medium comprising an underlying non-magnetic layer and a magnetic layer comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy formed in this order by lamination on the surface of a non-magnetic substrate. On the substrate, are formed a seed layer comprising an oxygen-containing non-magnetic amorphous metal or a seed layer comprising a non-magnetic amorphous metal having an oxygen-containing layer (not illustrated) on the surface, and an underlying non-magnetic layer is laminated on the seed layer. Further, a seed layer comprising an amorphous Cr- or V-alloy is formed on the substrate, and an underlying non-magnetic layer is laminated on the seed layer.
Inventors
- 👤 Yoshinobu Okumura
- 👤 Xingbo Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/65; G11B5/656; G11B5/73; G11B5/7368; G11B5/7369; G11B5/7379; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
69 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises an oxygen-containing non-magnetic metal and said oxygen-containing non-magnetic metal is amorphous as determined by X-ray diffraction.
Claim 2
Dependent Claim
69 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises an oxygen-containing non-magnetic metal and said oxygen-containing non-magnetic metal is amorphous as determined by X-ray diffraction.
Claim 3
Dependent Claim
24 words
A metal thin film magnetic recording medium as defined in claim 1, wherein the thickness of the seed layer is greater than 100 Å.
Claim 4
Dependent Claim
23 words
A metal thin film magnetic recording medium as defined in claim 1, wherein the seed layer is an oxygen-containing amorphous Cr-alloy or V-alloy.
Claim 5
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 1, wherein a protection layer is laminated on the magnetic layer.
Claim 6
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 4, wherein a lubrication layer is laminated on the protection layer.
Claim 7
Dependent Claim
25 words
A metal thin film magnetic recording medium as defined in claim 1, further comprising (v) another non-magnetic layer comprising Cr, adjacent to said magnetic layer.
Claim 8
Dependent Claim
78 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises a non-magnetic metal alloy, said alloy is amorphous as determined by X-ray diffraction, and the surface of said non-magnetic alloy, opposite said substrate, contains oxygen.
Claim 9
Dependent Claim
78 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises a non-magnetic metal alloy, said alloy is amorphous as determined by X-ray diffraction, and the surface of said non-magnetic alloy, opposite said substrate, contains oxygen.
Claim 10
Dependent Claim
24 words
A metal thin film magnetic recording medium as defined in claim 7, wherein the thickness of the seed layer is greater than 100 Å.
Claim 11
Dependent Claim
23 words
A metal thin film magnetic recording medium as defined in claim 7, wherein the seed layer is an oxygen-containing amorphous Cr-alloy or V-alloy.
Claim 12
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 7, wherein a protection layer is laminated on the magnetic layer.
Claim 13
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 10, wherein a lubrication layer is laminated on the protection layer.
Claim 14
Dependent Claim
25 words
A metal thin film magnetic recording medium as defined in claim 7, further comprising (v) another non-magnetic layer comprising Cr, adjacent to said magnetic layer.
Claim 15
Dependent Claim
91 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises an Cr-alloy or V-alloy, both said Cr-alloy and V-alloy comprising at least one element selected from the group consisting of Ta, Nb, Si, Al and C, and said Cr-alloy or V-alloy is amorphous as determined by X-ray diffraction.
Claim 16
Dependent Claim
91 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises an Cr-alloy or V-alloy, both said Cr-alloy and V-alloy comprising at least one element selected from the group consisting of Ta, Nb, Si, Al and C, and said Cr-alloy or V-alloy is amorphous as determined by X-ray diffraction.
Claim 17
Dependent Claim
24 words
A metal thin film magnetic recording medium as defined in claim 13, wherein the thickness of the seed layer is greater than 100 Å.
Claim 18
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 13, wherein the Cr- or V-alloy is an alloy containing Ta.
Claim 19
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 13, wherein a protection layer is laminated on the magnetic layer.
Claim 20
Dependent Claim
22 words
A metal thin film magnetic recording medium as defined in claim 16, wherein a lubrication layer is laminated on the protection layer.
Claim 21
Dependent Claim
25 words
A metal thin film magnetic recording medium as defined in claim 13, further comprising (v) another non-magnetic layer comprising Cr, adjacent to said magnetic layer.
Claim 22
Dependent Claim
78 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises a Cr-alloy or V-alloy comprising at least 40 at % Cr or V, and said Cr-alloy or V-alloy is amorphous as determined by X-ray diffraction.
Claim 23
Dependent Claim
78 words
A metal thin film magnetic recording medium, comprising: (i) a non-magnetic substrate; (ii) a seed layer on said substrate; (iii) an underlying non-magnetic layer, comprising Cr, on said seed layer; and (iv) a magnetic layer, comprising a Co-alloy having a uni-axial magnetocrystalline anisotropy, on said underlying non-magnetic layer; wherein said seed layer comprises a Cr-alloy or V-alloy comprising at least 40 at % Cr or V, and said Cr-alloy or V-alloy is amorphous as determined by X-ray diffraction.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2000-12-22 | 2001-06-23 | 2001-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-22 | 2005-06-23 | 2005-12-23 | $3760.00 | Window Closed / Lapsed |
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