Spin valve sensor with free layer structure having a cobalt niobium (CoNb) or cobalt niobium hafnium (CoNbHf) layer
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Abstract
A free layer structure of a spin valve sensor includes a cobalt niobium or cobalt niobium hafnium layer for providing a negative magnetostriction which completely or partially counterbalances a positive magnetostriction of a cobalt or cobalt iron layer wherein the cobalt or cobalt iron layer interfaces a copper spacer layer for increasing the magnetoresistive coefficient dr/R of the head. In one aspect of the invention the free layer structure consists of only the cobalt iron layer and the cobalt niobium or cobalt niobium hafnium layer.
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