US4670322A
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Metal oxide magnetic substance and a magnetic film consisting thereof and their uses
Assignee: Ricoh Co Ltd
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Filing: 1984-11-29
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Granted: 1987-06-02
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Expires: 2004-11-29
Abstract
Abstract The present invention provides a metal oxide magnetic substance represented by the general formula I: MeO·n[Al.sub.X M.sub.Y Fe.sub.2-x-(m/3)Y O.sub.3 ] (wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M), a magnetic film consisting thereof, and a magneto optical recording medium and a perpendicular magnetic recording medium having the magnetic film.
Inventors
- 👤 Hitoshi Nakamura
- 👤 Hazime Machida
- 👤 Motoharu Tanaka
- 👤 Atsuyuki Watada
- 👤 Fumiya Omi
- 👤 Nobuyuki Koinuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:10
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; C; C01; C01G; C01G49/00; C01G49/009; C01G55/00; C01G55/002; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/205; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/32; C01P2006/42; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24612; Y10T428/24942; Y10T428/2495; Y10T428/24959; Y10T428/24967; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
69 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 2
Dependent Claim
69 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 3
Dependent Claim
37 words
A recording medium according to claim 1, wherein said metal oxide further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 4
Dependent Claim
74 words
A magneto optical recording medium which comprises, on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 5
Dependent Claim
74 words
A magneto optical recording medium which comprises, on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 6
Dependent Claim
39 words
A recording medium according to claim 3, wherein said metal oxide magnetic substance further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 7
Dependent Claim
17 words
A recording medium according to claim 3, wherein said magnetic film has a thickness of 0.1-10 μm.
Claim 8
Dependent Claim
88 words
A magneto optical recording medium which comprises a substrate, a magnetic layer, formed on said substrate, which is consisted of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, and a reflective film formed on said magnetic layer.
Claim 9
Dependent Claim
88 words
A magneto optical recording medium which comprises a substrate, a magnetic layer, formed on said substrate, which is consisted of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, and a reflective film formed on said magnetic layer.
Claim 10
Dependent Claim
39 words
A recording medium according to claim 6, wherein said metal oxide magnetic substance further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 11
Dependent Claim
23 words
A recording medium according to claim 6, wherein said magnetic film is 0.1-10 μm thick and said reflective film is 500-10,000 Å thick.
Claim 12
Dependent Claim
89 words
A magneto optical recording medium which comprises, on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, a guide track layer, a reflective film and a protective film in the order named.
Claim 13
Dependent Claim
89 words
A magneto optical recording medium which comprises, on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, a guide track layer, a reflective film and a protective film in the order named.
Claim 14
Dependent Claim
39 words
A recording medium according to claim 9, wherein said metal oxide magnetic substance further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 15
Dependent Claim
30 words
A recording medium according to claim 9, wherein said magnetic film is 0.1-10 μm thick, said reflective film is 500-10,000 Å thick, and said protective film is 0.1-100 μm thick.
Claim 16
Dependent Claim
94 words
A magneto optical recording medium which comprises, on a substrate equipped with a guide track, a reflective film, a transparent adhesive layer, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M), and a heat-resisting layer in the order named.
Claim 17
Dependent Claim
94 words
A magneto optical recording medium which comprises, on a substrate equipped with a guide track, a reflective film, a transparent adhesive layer, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M), and a heat-resisting layer in the order named.
Claim 18
Dependent Claim
39 words
A recording medium according to claim 12, wherein said metal oxide magnetic substance further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 19
Dependent Claim
42 words
A recording medium according to claim 12, wherein said reflective film is about 500-10,000 Å thick, said transparent adhesive layer is about 0.1-10 μm thick, said magnetic film is about 0.1-10 μm thick and said heat-resisting layer is about 0.1-2 mm thick.
Claim 20
Dependent Claim
68 words
A magneto optical reocrding medium comprising a film of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 21
Dependent Claim
68 words
A magneto optical reocrding medium comprising a film of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5<n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M.
Claim 22
Dependent Claim
19 words
A magneto optical recording medium according to claim 15 wherein optically readable magnetic information is encoded in said film.
Claim 23
Dependent Claim
25 words
A magneto optical recording medium according to claim 15 which is magnetized perpendicularly to its plane for use as a perpendicular magneto optical recording medium.
Claim 24
Dependent Claim
41 words
A magneto optical recording medium according to claim 15, wherein said metal oxide magnetic substance further contains at leats one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 25
Dependent Claim
86 words
A magneto optical recording medium which comprises on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, a transparent dielectric layer and a reflective film in the order named.
Claim 26
Dependent Claim
86 words
A magneto optical recording medium which comprises on a substrate, a magnetic film consisting of a metal oxide magnetic substance represented by the general formula I: MeO.n[Al.sub.X M.sub.Y Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) wherein, Me is at least one member of Ba, Sr and Pb, M is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, 0<X≦0.8, 0<Y≦0.6, and m is the ionic valency of M, a transparent dielectric layer and a reflective film in the order named.
Claim 27
Dependent Claim
39 words
A recording medium according to claim 19, wherein said metal oxide magnetic substance further contains at least one member of Ni, Cu, Sb, Bi, Co, Mo, Nb, Pd, Mn, Yb, V, Te, Zr, Tc, Pt, Os, Re and W.
Claim 28
Dependent Claim
30 words
A recording medium according to claim 20, wherein said magnetic film is 0.1-10 μm thick, said transparent dielectric layer is 0.05-0.5 μm, and said reflective film is 500-10,000 Å thick.
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