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EP0300511A2
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Magnetic head
Assignee: Proterial Ltd
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Filing: 1988-07-25
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Granted: —
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Expires: 2008-07-25
Abstract
Abstract A magnetic head having at least one magnetic gap (2) in its magnetic path comprises an Fe-base soft magnetic alloy layer (3) in the magnetic path, at least 50 % of the structure of the alloy layer (3) consisting of fine crystalline particles having a body-centered cubic structure and an average particle size of 50 nm or less.
Inventors
- 👤 Yoshihito Yoshizawa
- 👤 Kiyotaka Yamauchi
- 👤 Shigekazu Suwabe
- 👤 Toshikazu Nishiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 02:06
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/02; G; G11; G11B; G11B5/00; G11B5/127
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
56 words
A magnetic head having at least one magnetic cap in its magnetic path, which comprises an Fe-base soft magnetic alloy layer in the magnetic path, at least 50 % of the structure of said alloy layer consisting of fine crystalline particles having a body-centered cubic structure and an average particle size of 50 nm or less.
Claim 2
Dependent Claim
56 words
A magnetic head having at least one magnetic cap in its magnetic path, which comprises an Fe-base soft magnetic alloy layer in the magnetic path, at least 50 % of the structure of said alloy layer consisting of fine crystalline particles having a body-centered cubic structure and an average particle size of 50 nm or less.
Claim 3
Dependent Claim
17 words
The magnetic head according to claim 1, wherein the balance of said alloy structure is substantially amorphous.
Claim 4
Dependent Claim
17 words
The magnetic head according to claim 1, wherein said alloy structure substantially consists of fine crystalline particles.
Claim 5
Dependent Claim
64 words
The magnetic head according to claim 1, wherein said Fe-base soft magnetic alloy layer has the composition of: Fe 100-u-v B u L v wherein L is at least on element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, W, Mn, Ru, Rh, Pd, Os, Ir and Pt, and u and v respectively satisfy the following relations: 2≦u≦10, 0≦v≦10.
Claim 6
Dependent Claim
88 words
The magnetic head according to claim 1, wherein said Fe-base soft magnetic alloy layer has the composition of: Fe 100-u-y-w B u L v X w wherein L is at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, W, Mn, Ru, Rh, Pd, Os, Ir and Pt, X is at least one element selected from the group consisting of C, Si, Ge, Ga, Aℓ, In and Sn, and u, v and w respectively satisfy the following relations: 2≦u≦10, 0≦v≦10, 0<w≦10.
Claim 7
Dependent Claim
19 words
The magnetic head according to claim 4, wherein 10% or less of Fe is substituted by Co and/or Ni.
Claim 8
Dependent Claim
19 words
The magnetic head according to claim 5, wherein 10% or less of Fe is substituted by Co and/or Ni.
Claim 9
Dependent Claim
14 words
The magnetic head according to claim 4, wherein said v is 0.5 - 5.
Claim 10
Dependent Claim
21 words
The magnetic head according to claim 5, wherein said v is 0.5 - 5 and said w is 5 or less.
Claim 11
Dependent Claim
17 words
The magnetic head according to claim 4 or 5, wherein said L in said composition is Ru.
Claim 12
Dependent Claim
25 words
The magnetic head according to claim 4 or 5, wherein said Fe-base soft magnetic alloy layer is laminated with a nonmagnetic or ferromagnetic layer alternately.
Claim 13
Dependent Claim
170 words
The magnetic head according to claim 1, wherein said Fe-base soft magnetic alloy layer has the composition represented by the general formula: (Fe 1-a M a ) 100-x-y-z-α-β-γ A x Si y B z M′ α M˝ β X γ wherein M is Co and/or Ni, M′ is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, M˝ is at least one element selected from the group consisting of V, Cr, Mn, Aℓ, elements in the platinum group, Sc, Y, rare earth elements, Au, Zn, Sn, Re, Mg, Ca, Sr, Ba, Na, K and Rb, A is Cu and/or Ag, X is at least one element selected from the group consisting of C, Ge, P, Ga, Sb, In, Be, As, and N, and a, x, y, z, α, β and γ respectively satisfy 0≦a≦0.5, 0.1≦x≦10, 0≦y≦30, 0≦z≦25, 0≦y+z+γ≦35, 0.1≦α≦30, 0≦β≦15 0≦γ≦20, at least 50% of the alloy structure being fine crystalline particles having an average particle size of 50nm or less.
Claim 14
Dependent Claim
25 words
The magnetic head according to claim 12, wherein said M′ is at least one element selected from the group consisting of Nb, Mo and Ta.
Claim 15
Dependent Claim
17 words
The magnetic head according to claim 12, wherein said y, z, α and γ satisfy: 10≦y+z+γ≦3.5, 0.1≦α≦10.
Claim 16
Dependent Claim
17 words
The magnetic head according to claim 14, wherein said y, z, α and γ satisfy: 0≦y+z+γ≦10, 10<α≦30.
Claim 17
Dependent Claim
21 words
The magnetic head according to claim 12, wherein said a, y, z and α respectively satisfy: 0≦a≦0.3, 0≦y≦25, 2≦z≦25, 15≦y+z≦30, 0.1≦α≦10.
Claim 18
Dependent Claim
23 words
The magnetic head according to claim 12, wherein said a, x, y, z and α respectively satisfy: 0≦a≦0.3, 0.5≦x≦2, 8≦y≦23, 3≦z≦18, 18≦y+z≦26, 2≦α≦8.
Claim 19
Dependent Claim
36 words
The magnetic head according to claim 12, wherein said M˝ is at least one element selected from the group consisting of Ru, Rh, Pd, Os, Ir, Pt, Au, Cr and V, and said β satisfies: 0<β≦10.
Claim 20
Dependent Claim
12 words
The magnetic head according to claim 12, wherein said X satisfies: 0.5≦X≦2.
Claim 21
Dependent Claim
23 words
The magnetic head according to claim 12, wherein said Fe-base soft magnetic alloy layer is laminated with a nonmagnetic or ferromagnetic layer alternately.
References Cited (Backward Citations)
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