Soft magnetic film having improved saturated magnetic flux density, magnetic head using the same, and manufacturing method therefor
AssigneeAlps Electric Co., Ltd.
InventorsMitsuo Kawasaki, Yoshihiro Kanada
Life of this patent
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Abstract
A lower magnetic pole layer and/or an upper magnetic pole layer are formed of a CoFeα alloy in which the component ratio X of Co is 8 to 48 mass %, the component ratio Y of Fe is 50 to 90 mass %, the component ratio Z of the element α (the element α is at least one of Ni and Cr) is 2 to 20 mass %, and the equation X+Y+Z=100 mass % is satisfied. Consequently, the saturated magnetic flux density can be 2.0 T or more, and a thin-film magnetic head have a higher recording density can be manufactured.
Claims30
A thin-film magnetic head comprising a lower core layer, an upper core layer, and a magnetic pole portion provided between the lower core layer and the upper core layer, a width in a track width direction of the magnetic pole portion being formed smaller than that of each of the lower core layer and the upper core layer,
- wherein the magnetic pole portion comprises a lower magnetic pole layer in contact with the lower core layer, an upper magnetic pole layer in contact with the upper core layer, and a gap layer provided between the lower magnetic pole layer and the upper magnetic pole layer,
- at least one of the upper magnetic pole layer and the lower magnetic pole layer contains at least two sub-magnetic layers, in which a sub-magnetic layer in contact with the gap layer has a composition represented by CoxFeyNiz, wherein X is 8 to 48 mass %, ratio Y is 50 to 90 mass %, ratio Z is 2 to 20 mass %, X+Y+Z being 100 mass %, and
- at least one sub-magnetic layer other than the sub-magnetic layer in contact with the gap layer is formed of an NiFe alloy.
A thin-film magnetic head comprising a lower core layer, a bulged lower magnetic pole layer formed on the lower core layer so as to be exposed to an opposing surface opposing a recording medium, a gap layer, an upper core layer formed above the lower magnetic pole layer with the gap layer provided therebetween, and a coil layer for supplying a recording magnetic field to the lower core layer and the upper core layer,
- wherein the lower magnetic pole layer is composed of at least two sub-magnetic layers, in which a sub-magnetic layer in contact with the gap layer has a composition represented by CoxFeyNiz, X is 23 to 32 mass %, Y is 58 to 71 mass %, Z is 2 to 20 mass %, X+Y+Z being 100 mass %, and
- at least one sub-magnetic layer other than the sub-magnetic layer in contact with the gap layer is formed of an NiFe alloy.
A thin-film magnetic head comprising a lower core layer, a bulged lower magnetic pole layer formed on the lower core layer so as to be exposed to an opposing surface opposing a recording medium, a gap layer, an upper core layer formed above the lower magnetic pole layer with the gap layer provided therebetween, and a coil layer for supplying a recording magnetic field to the lower core layer and the upper core layer,
- wherein the lower magnetic pole layer is composed of at least two sub-magnetic layers, in which a sub-magnetic layer in contact with the gap layer has a composition represented by CoxFeyCrz, wherein X is 23.3 to 28.3 mass %, Y is 63 to 67.5 mass %, Z of Cr of 4.2 to 13.6 mass %, X+Y+Z being −100 mass %, and,
- at least one sub-magnetic layer other than the sub-magnetic layer in contact with the gap layer is formed of an NiFe alloy.
A thin-film magnetic comprising a lower core layer, an upper core layer, and a magnetic pole portion provided between the lower core layer and the upper core layer, a width in a track width direction of the magnetic pole portion being formed smaller than each of the lower core layer and the upper core layer,
- wherein the magnetic pole portion comprises a lower magnetic pole layer in contact with the lower core layer, an upper magnetic pole layer in contact with the upper core layer, and a gap layer provided between the lower magnetic pole layer and the upper magnetic pole layer,
- wherein at least one of the upper magnetic pole layer and the lower magnetic pole layer is composed of at least two sub-magnetic layers, in which a sub-magnetic layer in contact with the gap layer has a composition represented by CoxFeyCrz, wherein X is 23.3 to 28.3 mass %, Y is 63 to 67.5 mass %, and ratio Z of Cr of 4.2 to 13.6 mass %, X+Y+Z being 100 mass %, and
- at least one sub-magnetic layer other than the sub-magnetic layer in contact with the gap layer is formed of NiFe alloy.
Dependencies are inferred from the claim text.