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US 2004/0057166 A1Published application
Free layer design for higher areal density
AssigneeInternational Business Machines Corporation
InventorHardayal Singh Gill
Life of this patent
Estimating the term…
Abstract
A magnetic head having a first layer having a positive magnetostriction and a second layer coupled to the first layer. The second layer has a negative magnetostriction that counteracts at least a portion of the positive magnetostriction of the first layer so that the net effective magnetic anisotropy of the layers together is reduced or essentially cancelled, thereby increasing a sensitivity of the layer(s) to external magnetic fields.
Claims18
A magnetic head, comprising:
- a first layer having a positive magnetostriction;
- and
- a second layer coupled to the first layer, the second layer having a negative magnetostriction that counteracts at least a portion of the positive magnetostriction of the first layer.
A sensor of a magnetic head, comprising:
- a first layer having a positive magnetostriction;
- a second layer coupled to the first layer, the second layer having a negative magnetostriction that counteracts at least a portion of the positive magnetostriction of the first layer;
- a spacer layer positioned between the first and second layers, the spacer layer being effective to make magnetizations of the first and second layers antiparallel;
- wherein the second layer is less electrically conductive than the first layer.
1 more element
A magnetic storage system, comprising:
- magnetic media;
- at least one head for reading from and writing to the magnetic media, each head having:
- a sensor including:
- a first layer having a positive magnetostriction;
- a spacer layer coupled to the first layer;
- a second layer coupled to the spacer layer, the second layer having a negative magnetostriction that counteracts at least a portion of the positive magnetostriction of the first layer;
- a write element coupled to the read portion;
- and
- a slider for supporting the head;
- and
- a control unit coupled to the head for controlling operation of the head.
8 more elements
Dependencies are inferred from the claim text.