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Graphic showing how magnetic tunnel junction used in Magnetic RAM differs from magnetic structure used in GMR head in disk drives. Both use the "spintronic" or "spin-polarized" effect of magnetic fields on electrons. But while the GMR head is an in-plane structure with a metallic, non-magnetic spacer layer, magnetic tunnel junctions are through-the-plane sturctures with insulating (non metalllic, non-mangetic) spacer layers.
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