US5084795A — Magnetic head and method of manufacturing the same

Claim 1

Independent Claim 155 words

A metal-in-gap magnetic head which employs as a back core a ferrite and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 6≦ a≦93 4≦b≦20 0≦c≦20 2≦d≦20 5≦b+c a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein, said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 2

Dependent Claim 155 words

A metal-in-gap magnetic head which employs as a back core a ferrite and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 6≦ a≦93 4≦b≦20 0≦c≦20 2≦d≦20 5≦b+c a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein, said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 3

Dependent Claim 153 words

A metal-in-gap magnetic head which employs as a back core a ferrite and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 65≦a≦93 4≦b≦20 1≦c≦20 2≦d≦20 a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 4

Dependent Claim 153 words

A metal-in-gap magnetic head which employs as a back core a ferrite and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 65≦a≦93 4≦b≦20 1≦c≦20 2≦d≦20 a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 5

Dependent Claim 136 words

A magnetic head according to claim 2, wherein said magnetic alloy film disposed in the vicinity of said magnetic gap comprises laminated layers has a composition which is modulated in the direction of lamination of said layers and has an average composition expressed by the following composition formula: Ta' Mb' Xc' Nd' where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a', b', c' and d' are atomic percents of an average composition which fulfill the following conditions: 65≦a'≦93 4≦b'≦20 1≦c'≦20 2≦d'≦20 a'+b'+c'+d'=100

Claim 6

Dependent Claim 162 words

A metal-in-gap magnetic head which employs as a back core a ferrite which does not readily generate sliding noises and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 6≦ a≦93 4≦b≦20 0≦c≦20 2≦d≦20 5≦b+c a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein, said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 7

Dependent Claim 162 words

A metal-in-gap magnetic head which employs as a back core a ferrite which does not readily generate sliding noises and which employs a magnetic alloy film having a composition expressed by the following composition formula in the vicinity of a magnetic gap: Ta Mb Xc Nd where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Nb, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a, b, c and d are atomic percents which fulfill the following conditions: 6≦ a≦93 4≦b≦20 0≦c≦20 2≦d≦20 5≦b+c a+b+c+d=100 and wherein undulation of reproduction output caused by a pseudogap is 2.5 dB or less and wherein, said head further comprises a nitride layer interposed between said back core and said magnetic alloy film.

Claim 8

Dependent Claim 140 words

A magnetic head according to claim 1 or 4, wherein said magnetic alloy film disposed in the vicinity of said magnetic gap comprises laminated layers has a composition which is modulated in the direction of lamination of said layers and has an average composition expressed by the following composition formula: Ta' Mb' Xc' Nd' where T is at least one metal element selected from a group consisting of Fe, Co and Ni, M is at least one metal element selected from a group consisting of Ng, Zr, Ti, Ta, Hf, Cr, Mo, W and Mn, X is at least one metalloid element selected from a group consisting of B, Si and Ge, N is nitrogen, and a', b', c' and d' are atomic percents of an average composition which fulfill the following conditions: 65≦a'≦93 4≦b'≦20 0≦c'≦20 ≦ d'≦20 5≦b'+c' a'+b'+c'+d'=100

Claim 9

Dependent Claim 48 words

A magnetic head according to any one of claim 1, 2, 3 or 4, further comprising a Si, B or Al nitride film having a thickness of 300 Å or less, said nitride film being disposed in an interface between said magnetic alloy film and said ferrite core.

Claim 10

Dependent Claim 18 words

A metal-in-gap magnetic head according to claim 4 wherein said ferrite is a single crystal ferrite containing Sn.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1995-01-27	1995-07-29	1996-01-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1999-01-27	1999-07-29	2000-01-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2003-01-27	2003-07-29	2004-01-28	$7700.00	Window Closed / Lapsed

Magnetic head and method of manufacturing the same

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag