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.
- Ferromagnetic resonance
- Gilbert damping
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics