Abstract
Mesoscopic ferromagnet (F)/normal metal (N) structures have recently attracted considerable attention. Slonczewski and Berger proposed that a spin-current may switch the magnetization orientation by means of a “spin-transfer” to the magnetization. We demonstrate that there is also a reverse mechanism: a moving magnetization vector loses angular momentum by emitting a spin-current. We outline the consequences of spin-pumping for (a) the Gilbert damping constant and (b) spin accumulation in adjacent normal metals and semiconductors, in F–N and F–N–F systems.
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