Magnetic Head Having Stable Shield Domain Structure
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsKoji Kataoka, Takashi Wagatsuma
Life of this patent
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Abstract
A manner for stabilizing the shield domain structure is described that employs the magnetic field of a hard bias layer. More particularly, it has been found that the shield domain structure is stabilized when the height of the hard bias layer in the depth direction is made substantially half the height of upper shield layer. In another embodiment of the invention, a stabilizing structure is provided at approximately the midpoint of the shield in order to fix the closure domain of the shield to the desired two-domain structure. In an embodiment of the invention, the stabilizing structure is made convex or concave as viewed from the air-bearing surface.
Claims24
A method for manufacturing a magnetic head, comprising:
- providing a first shield layer having a first height in the depth direction;
- providing a hard bias layer over the first shield laye having a second height in the depth direction;
- and
- providing a second shield layer over the hard bias layer having a third height in the depth direction,
- wherein the second height is approximately in the range of ⅓ to ½ of the first height.
A magnetic head, comprising:
- a first shield layer having a first height in the depth direction;
- a hard bias layer over the first shield laye having a second height in the depth direction;
- and
- a second shield layer over the hard bias layer having a third height in the depth direction,
- wherein the second height is approximately in the range of ⅓ to ½ of the first height.
A method for manufacturing a magnetic head, comprising:
- providing a first shield layer having a first height in the depth direction;
- providing a second shield layer having a second height in the depth direction,
- providing a first stabilizing section at approximately the midpoint of the first shield.
A magnetic head, comprising:
- a first shield layer having a first height in the depth direction;
- a second shield layer having a second height in the depth direction,
- a first stabilizing section at approximately the midpoint of the first shield.
Dependencies are inferred from the claim text.