Loading patent…
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorTsann Lin
Estimating the term…
A method and apparatus providing a stabilized top shield in a read head used for the longitudinal or perpendicular magnetic recording is disclosed. The top shield includes a laminate structure including at least three layers of ferromagnetic and antiferromagnetic films in a frame. Unidirectional anisotropy induced at the interface of the ferromagnetic and antiferromagnetic films is optimized by selecting suitable compositions and thicknesses to achieve the stabilization of the top shield while maintaining high permeability. In an alternative method, the top shield includes a ferromagnetic Ni—Fe film in a central region and multiple layers comprising ferromagnetic Co—Fe and Ni—Fe layers and an antiferromagnetic layer. Unidirectional anisotropy induced at the interfaces of ferromagnetic and antiferromagnetic layers by selecting suitable compositions and thicknesses of the ferromagnetic and antiferromagnetic layers to achieve the stabilization of the top shield through magnetostatic interactions between the central and side regions.
A top shield for a read sensor comprising a laminate structure, wherein a plurality of shield layers and at least one bias layer are alternatively deposited, wherein a thickness of the plurality of shield layers is selected to attain a designed unidirectional anisotropy of the laminate structure and to maintain the unidirectional anisotropy of the laminate structure greater than easy-axis coercivity of the laminate structure.
A method for forming a top shield;
A storage device, comprising:
A top shield for a read sensor comprising a laminate structure, wherein the laminate structure comprises at least three layers of alternating antiferromagnetic bias and feromagnetic shield layers, wherein an antiferromagnetic bias layer is disposed between two ferromagnetic layers and wherein a thickness of the shield layer is selected to attain a designed unidirectional anisotropy of the laminate structure and to maintain the unidirectional anisotropv of the laminate structure greater than easy-axis coercivity of the laminate structure.
A method for forming a top shield;
Dependencies are inferred from the claim text.