Multiple transfer of angular momentum quanta from a spin-polarized hole   to magnetic ions in ZnMnSe/ZnBeSe quantum wells
  The magnetization kinetics in (Zn,Mn)Se/(Zn,Be)Se quantum wells has been studied on a ps-time scale after pulsed laser excitation. The magnetization induced by an external magnetic field is reduced by up to 30% during ~100 ps due to spin and energy transfer from photocarriers to Mn spin system. The giant Zeeman splitting leads to a complete spin polarization of the carriers, resulting in a strong suppression of flip-flop processes between carriers and magnetic ions. Therefore a multiple angular momentum transfer from each spin-polarized hole to the Mn ions becomes the dominant mechanism in the magnetization dynamics. A model based on spin-momentum coupling in the valence band is suggested for explaining this transfer. 
A. V. Akimov, A. V. Scherbakov, D. R. Yakovlev, I. A. Merkulov, M.   Bayer, A. Waag, and L. W. Molenkamp