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US 8,619,393 B2Granted
Devices and methods using recessed electron spin analyzers
AssigneeSeagate Technology LLC
InventorScott Stokes
Life of this patent
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Abstract
In certain embodiments, a magnetic had includes a top shield and a bottom shield positioned at an air bearing surface. A polarizer and a nonmagnetic layer are positioned between the top and bottom shields. An analyzer is positioned adjacent the nonmagnetic layer at a distance recessed from the air bearing surface. Current travels through the top shield, polarizer, nonmagnetic layer, and first analyzer.
Claims9
A magnetic head comprising:
- a top shield and a bottom shield both positioned at an air bearing surface (ABS);
- a polarizer and a nonmagnetic layer both positioned at the ABS between the top and bottom shields;
- a first analyzer positioned at a distance recessed from the ABS, wherein the nonmagnetic layer is a conductor and is positioned between the polarizer and first analyzer;
- and
- a current path through the top shield, polarizer, nonmagnetic layer, and first analyzer, wherein the first analyzer is directly coupled to the nonmagnetic layer.
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A method comprising:
- passing current through a free layer, nonmagnetic conductor layer, and pinned layer;
- both the free layer and the nonmagnetic conductor layer are positioned at an air bearing surface, and the pinned layer is recessed a distance from the air bearing surface;
- and
- transferring an electron spin from the free layer through the nonmagnetic conductor layer to the pinned layer, wherein the pinned layer is directly coupled to the nonmagnetic layer.
1 more element
Dependencies are inferred from the claim text.