= Spin valve
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A device with a reference magnetic layer whose <magnetization> is comparatively fixed and another layer whose <magnetization> responds more readily to an applied field. The resistance reads their relative alignment. Fert's account describes how such <giant magnetoresistance> sensors entered hard-disk read heads in 1997.<Nobel Lecture: Origin, development, and future of spintronics by Albert Fert>[p.1519, spin-valve structure and historical read-head adoption]{ref}
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