Tunnel MR head with closed-edge laminated free layer
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United States of America Patent
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Dec 8, 2009
Grant Date -
Aug 16, 2007
app pub date -
Feb 14, 2006
filing date -
Feb 14, 2006
priority date (Note) -
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Abstract
In a tunnel magnetoresistive (TMR) device, free sublayers are separated by an intermediate spacer layer that serves to ensure a uniform circumferential magnetization in the free stack, counterbalancing orange-peel coupling by antiferromagnetic exchange coupling. Thus, a CPP MR device may have a seed stack, a pinned stack on the seed stack, and a tunnel barrier on the pinned stack. A free stack can be on the tunnel barrier, and the free stack can include structure for promoting uniform circumferential magnetization in the free stack.
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