US4748089A
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Multilayered ferromagnetic amorphous alloy film and magnetic head employing the same
Assignee: Hitachi Ltd
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Filing: 1984-12-13
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Granted: 1988-05-31
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Expires: 2004-12-13
Abstract
Abstract A multilayered ferromagnetic amorphous alloy film is constituted by a plurality of main ferromagnetic material alloy films of a ferromagnetic amorphous alloy laminated one upon another with a spacer ferromagnetic material layer interposed therebetween, the spacer ferromagnetic material layer being of a ferromagnetic material different from the ferromagnetic alloy. Also disclosed is a magnetic head employing the above-described multilayered film for, at least, a portion of a core thereof. The multilayered film has excellent magnetic characteristics and is easily patterned.
Inventors
- 👤 Noriyuki Kumasaka
- 👤 Kazuo Shiiki
- 👤 Shigekazu Otomo
- 👤 Yoshihiro Shiroishi
- 👤 Takeo Yamashita
- 👤 Noritoshi Saito
- 👤 Kiminari Shinagawa
- 👤 Mitsuhiro Kudo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
B; B82; B82Y; B82Y25/00; G; G11; G11B; G11B5/00; G11B5/127; G11B5/1278; G11B5/147; G11B5/187; G11B5/21; G11B5/31; H; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/12; H01F10/13; H01F10/32; H01F10/3204; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/11; Y10T428/115; Y10T428/12; Y10T428/12493; Y10T428/12632; Y10T428/12771; Y10T428/12861; Y10T428/12937; Y10T428/12944; Y10T428/12951
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
83 words
A multilayered ferromagnetic amorphous alloy film comprising: a plurality of main ferromagnetic material films of a ferromagnetic amorphous alloy laminated one upon another with a spacer ferromagnetic material layer interposed therebetween, said spacer ferromagnetic material layer being a ferromagnetic material different from said ferromagnetic alloy, wherein the thickness of each of the layers constituted by said main ferromagnetic material films is 0.05 to 2 μm and the thickness of each layer constituted by said spacer ferromagnetic material layer is 10 to 200 Å.
Claim 2
Dependent Claim
83 words
A multilayered ferromagnetic amorphous alloy film comprising: a plurality of main ferromagnetic material films of a ferromagnetic amorphous alloy laminated one upon another with a spacer ferromagnetic material layer interposed therebetween, said spacer ferromagnetic material layer being a ferromagnetic material different from said ferromagnetic alloy, wherein the thickness of each of the layers constituted by said main ferromagnetic material films is 0.05 to 2 μm and the thickness of each layer constituted by said spacer ferromagnetic material layer is 10 to 200 Å.
Claim 3
Dependent Claim
59 words
A multilayered ferromagnetic amorphous alloy film according to claim 1, wherein each of said main ferromagnetic material films is made of one amorphous alloy selected from the group consisting of a Co-Zr system alloy, a Co-Nb system alloy, a Co-Ti system alloy, an Fe-B system alloy, an Fe-Si-B system alloy, an Fe-Co-Si-B system alloy and a Co-Ni-Zr system alloy.
Claim 4
Dependent Claim
62 words
A multilayered ferromagnetic amorphous alloy film according to claim 2, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 5
Dependent Claim
70 words
A multilayered ferromagnetic amorphous alloy film according to claim 2, wherein each of said main ferromagnetic material films is made of an amorphous alloy having a composition consisting essentially of one alloy selected from the group consisting of a Co-Zr system alloy, a Co-Nb system alloy and a Co-Ti system alloy, and at least one element selected from the group consisting of W, Mo, Ti, Nb, Ta, Si and B.
Claim 6
Dependent Claim
62 words
A multilayered ferromagnetic amorphous alloy film according to claim 4, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 7
Dependent Claim
62 words
A multilayered ferromagnetic amorphous alloy film according to claim 1, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 8
Dependent Claim
103 words
A magnetic head comprising: a multilayered ferromagnetic amorphous alloy film formed by laminating a plurality of main ferromagnetic material films of a ferromagnetic amorphous alloy while interposing a spacer ferromagnetic material layer of a ferromagnetic material different from said ferromagnetic alloy between said main ferromagnetic material films, said multilayered ferromagnetic amorphous alloy film constituting, at least, one portion of a core of said magnetic head, wherein the thickness of each of the layers constituted by said main ferromagnetic material films is 0.05 to 2 μm and the thickness of each layer constituted by said spacer ferromagnetic material layer is 10 to 200 Å.
Claim 9
Dependent Claim
103 words
A magnetic head comprising: a multilayered ferromagnetic amorphous alloy film formed by laminating a plurality of main ferromagnetic material films of a ferromagnetic amorphous alloy while interposing a spacer ferromagnetic material layer of a ferromagnetic material different from said ferromagnetic alloy between said main ferromagnetic material films, said multilayered ferromagnetic amorphous alloy film constituting, at least, one portion of a core of said magnetic head, wherein the thickness of each of the layers constituted by said main ferromagnetic material films is 0.05 to 2 μm and the thickness of each layer constituted by said spacer ferromagnetic material layer is 10 to 200 Å.
Claim 10
Dependent Claim
40 words
A magnetic head according to claim 7, wherein, at least, a portion on a magnetic recording medium side of a magnetic pole effecting generation or both generation and detection of a signal magnetic field is constituted by said multilayered film.
Claim 11
Dependent Claim
59 words
A magnetic head according to claim 8, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 12
Dependent Claim
35 words
A magnetic head according to claim 8, wherein, at least, a portion of a magnetic pole of a ring type magnetic head in the vicinity of a magnetic gap is constituted by said multilayered film.
Claim 13
Dependent Claim
41 words
A magnetic head according to claim 8, wherein, at least, a distal end portion of the main magnetic pole of a perpendicular magnetic recording head having a main magnetic pole and an auxiliary magnetic pole is constituted by said multilayered film.
Claim 14
Dependent Claim
56 words
A magnetic head according to claim 8, wherein each of said main ferromagnetic material films is made of one amorphous alloy selected from the group consisting of a Co-Zr system alloy, a Co-Nb system alloy, a Co-Ti system alloy, an Fe-B system alloy, an Fe-Si-B system alloy, an Fe-Co-Si-B system alloy and a Co-Ni-Zr system alloy.
Claim 15
Dependent Claim
59 words
A magnetic head according to claim 12, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 16
Dependent Claim
67 words
A magnetic head according to claim 12, wherein each of said main ferromagnetic material films is made of an amorphous alloy having a composition consisting essentially of one alloy selected from the group consisting of a Co-Zr system alloy, a Co-Nb system alloy and a Co-Ti system alloy, and at least one element selected from the group consisting of W, Mo, Ti, Nb, Ta, Si and B.
Claim 17
Dependent Claim
59 words
A magnetic head according to claim 14, wherein said spacer ferromagnetic material layer is made of an amorphous alloy of a constituent element combination different from that of said main ferromagnetic material films, or one ferromagnetic polycrystalline material selected from the group consisting of Co element, Ni element, Fe element, an Ni-Fe system alloy and an Fe-Al-Si system alloy.
Claim 18
Dependent Claim
39 words
A multilayered ferromagnetic amouphous alloy film according to claim 1, wherein said multilayered ferromagnetic amorphous alloy film has a coercive force of less than or equal to 0.5 Oe and a permeability of at least 2000 at 5 MHz.
Claim 19
Dependent Claim
36 words
A magnetic head according to claim 8, wherein said multilayered ferromagnetic amorphous alloy film has a coercive force of less than or equal to 0.5 Oe and a permeability of at least 2000 at 5 MHz.
References Cited (Backward Citations)
US4079430A
Cited
US4312683A
Cited
JPS5658125A
Cited
US4325733A
Cited
JPS57105838A
Cited
US4364020A
Cited
US4433474A
Cited
US4565746A
Cited
JPS58128018A
Cited
EP0114076A2
Cited
US4610935A
Cited
US4506248A
Cited
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