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A spin valve is a device consisting of two or more conducting magnetic materials, that alternates its electrical resistance (from low to high or high to low) depending on the alignment of the magnetic layers, in order to exploit the Giant Magnetoresistive effect. The magnetic layers of the device align "up" or "down" depending on an external magnetic field. Layers are made of two materials with different hysteresis curves so one layer ("soft" layer) changes polarity while the other ("hard" layer) keeps its polarity. In the figures below, the top layer is soft and the bottom layer is hard.
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Spin valves are used in magnetic sensors and hard disk read heads.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Spin_valve". A list of authors is available in Wikipedia.|