US4670323A
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Magneto-optic recording medium having a metal oxide recording layer
Assignee: Ricoh Co Ltd
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Filing: 1984-11-23
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Granted: 1987-06-02
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Expires: 2004-11-23
Abstract
Abstract The present invention provides a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (wherein, Me is at least one member of Ba, Sr and Pb. M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (wherein, Me is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), a magnetic film consisting thereof, and a magneto optical recording medium and parpendicular 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
2026-11-05 06:39
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/205; 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
114 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6,O<X≦0.8,O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb and M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 2
Dependent Claim
114 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6,O<X≦0.8,O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb and M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 3
Dependent Claim
39 words
A recording medium according to claim 1, 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 4
Dependent Claim
16 words
A recording medium according to claim 1, wherein said magnetic film has a thickness of 0.1-10μm.
Claim 5
Dependent Claim
128 words
A magneto optical recording medium which comprises a substrate, a magnetic layer, formed on said substrate, which consists of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb. M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), and a reflective film formed on said magnetic layer.
Claim 6
Dependent Claim
128 words
A magneto optical recording medium which comprises a substrate, a magnetic layer, formed on said substrate, which consists of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb. M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), and a reflective film formed on said magnetic layer.
Claim 7
Dependent Claim
39 words
A recording medium according to claim 4, 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 8
Dependent Claim
21 words
A recording medium according to claim 4, wherein said magnetic film is 0.1-10μm thick and said reflective film is 500-10,000Å thick.
Claim 9
Dependent Claim
127 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), a transparent dielectric layer and a reflective film in the order named.
Claim 10
Dependent Claim
127 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), a transparent dielectric layer and a reflective film in the order named.
Claim 11
Dependent Claim
39 words
A recording medium according to claim 7, 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 12
Dependent Claim
27 words
A recording medium according to claim 7, wherein said magnetic film is 0.1-10μm thick, said transparent dielectric layer is 0.05-0.5μm, and said reflective film is 500-10,000Å thick.
Claim 13
Dependent Claim
130 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) of represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me, is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), a guide track layer, a reflective film and a protective film in the order named.
Claim 14
Dependent Claim
130 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) of represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me, is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), a guide track layer, a reflective film and a protective film in the order named.
Claim 15
Dependent Claim
39 words
A recording medium according to claim 10, 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 16
Dependent Claim
27 words
A recording medium according to claim 10, wherein said magnetic film is 0.1-10μm thick, said reflective film is 500-10,000Å thick, and said protective film is 0.1-100μm thick.
Claim 17
Dependent Claim
134 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta Sn and Ge, 5≦n≦6,O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ), or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), and a heat-resisting layer in the order named.
Claim 18
Dependent Claim
134 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[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, Sr and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta Sn and Ge, 5≦n≦6,O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ), or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, Sr and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0), and a heat-resisting layer in the order named.
Claim 19
Dependent Claim
39 words
A recording medium according to claim 13, 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 20
Dependent Claim
39 words
A recording medium according to claim 13, wherein said reflective film is about 500-10,000Å thick, said transparent adhesive layer is about 0.1-10μm thick, said magnetic film is about 0.1-10μm thick and said heat resisting layer is about 0.1-2mm thick.
Claim 21
Dependent Claim
107 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-x-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8, and m is the ionic valency of M I ) or represented by the general formula: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 22
Dependent Claim
107 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-x-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least one member of Ba, and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8, and m is the ionic valency of M I ) or represented by the general formula: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, and Pb, M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 23
Dependent Claim
37 words
A recording medium according to claim 16, 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 24
Dependent Claim
108 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least on member of Ba, and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, and Pb. M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 25
Dependent Claim
108 words
A magneto optical recording medium comprising a recording layer of a metal oxide magnetic substance represented by the general formula I: MeO.n[Ga.sub.X M.sub.Y.sup.I Fe.sub.2-X-(m/3)Y O.sub.3 ] (I) (wherein, Me is at least on member of Ba, and Pb, M I is at least one member of Zn, Sc, In, Cr, Ir, Ru, Rh, Ti, Ta, Sn and Ge, 5≦n≦6, O<X≦0.8, O<Y≦0.8 and m is the ionic valency of M I ) or represented by the general formula II: MeO.n[M.sub.T.sup.II Fe.sub.2-T O.sub.3 ] (II) (wherein, Me is at least one member of Ba, and Pb. M II is at least one member of Ga and Al, 5≦n≦6 and O<T≦1.0).
Claim 26
Dependent Claim
19 words
A magneto optical recording medium according to claim 18 wherein optically readable magnetic information is encoded in said film.
Claim 27
Dependent Claim
25 words
A magneto optical recording medium according to claim 18 which is magnetized perpendicularly to its plane for use as a perpendicular magneto optical recording medium.
Claim 28
Dependent Claim
41 words
A magneto optical recording medium according to claim 18, 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.
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