An approach that could reduce the size and increase the speed of magnetic memories is to use magnetization precession, in which a smaller magnetic field is used to store information in the form of rotations of the magnetization direction. Weber et al. (p. 1015; see the Perspective by Ralph) used spin-injection into a thin ferromagnetic film from a polarized semiconductor cathode to induce the magnetization precession. Their results indicate that spin-injection could be a viable route to smaller and faster magnetic memories.
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A 2001 study studied this question.