Woltersdorf, Georg and Mosendz, O. and Heinrich, B. and Back, Christian H.
Magnetization dynamics due to pure spin currents in magnetic double layers.
Physical Review Letters (PRL) 99 (24), p. 246603.
The magnetization dynamics in magnetic double layers is affected by spin-pump and spin-sink effects. So far, only the spin pumping and its
effect on the magnetic damping has been studied. However, due to
conservation of angular momentum this spin current also leads to
magnetic excitation of the layer dissipating this angular momentum. In
this Letter we use time resolved magneto-optic Kerr effect to directly
show the excitation due to the pure spin current. In particular, we
observe magnetization dynamics due to transfer of angular momentum in
magnetic double layers. In contrast to other experiments where a spin
polarized charge current is passed through a nanomagnet, the effects
discussed in this Letter are based on pure spin currents without net
transfer of electric charge.