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US 2007/0177299 A1Published application
Magnetic head and method for production therefor
AssigneeHitachi Global Storage Technologies Japan, Ltd.
InventorsKazue Kudo, Gen Oikawa, Tetsuya Okai, Ichiro Oodake, Hiromi Shiina
Life of this patent
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Abstract
At least one of lower and upper magnetic cores is composed of magnetic films each of which contains two or more elements of Co, Ni, and Fe, which are formed by electroplating in a plating bath with pH 2 or less, and which have a saturation magnetic flux density of 23,000 gauss or more.
Claims10
1-5. (canceled)
A thin-film magnetic head comprising:
- a magnetic core having magnetic layers, and
- a magnetic gap film facing said magnetic core;
- wherein a magnetic layer, of said magnetic layers, is formed by electroplating in a plating bath having pH value of 2 or less and containing saccharin sodium to produce a thickness of 3 μm or more for said magnetic layer;
- wherein said magnetic layer contains Co, Ni and Fe, with 20≦Co≦40 wt %, 0<Ni≦2 wt %, and 60≦Fe≦80 wt %, and has a saturation magnetic flux density of 23,000 gauss or more, and wherein said magnetic layer which is formed by electroplating is the nearest plated layer to said magnetic gap of said magnetic layers.
1 more element
A thin-film magnetic head, comprising:
- a read element,
- a first magnetic layer formed above said read element,
- a magnetic gap film formed above said first magnetic layer,
- an underlayer formed above said magnetic gap, and
- a second magnetic layer formed on said underlayer, formed by electroplating in a plate bath containing saccharin sodium to produce a thickness of 3 μm or more for said second magnetic layer;
- wherein at least a first part of said second magnetic layer contains Co, Ni and Fe, with 20≦Co≦40 wt %, 0<Ni≦2 wt %, and 60≦Fe≦80 wt %, and has a saturation magnetic flux density of 23,000 gauss or more.
3 more elements
A thin-film magnetic head, comprising;
- a read element,
- a first magnetic layer formed above said read element,
- a magnetic gap film formed above said first magnetic layer;
- a coil and insulating layer formed above said first magnetic layer, and
- a second magnetic layer formed above said magnetic layer gap;
- wherein said first magnetic layer is formed by electroplating in a plate bath having pH value of 2 or less and containing saccharin sodium to produce a thickness of 3 μm or more for said second magnetic layer;
- wherein at least a first part of said first magnetic layer contains Co, Ni and Fe, with 20≦Co≦40 wt %, 0<Ni≦2 wt %, and 60≦Fe≦80 wt %, and has a saturation magnetic flux density of 23,000 gauss or more.
4 more elements
Dependencies are inferred from the claim text.