Physics – Condensed Matter – Materials Science
Scientific paper
2006-01-30
Physics
Condensed Matter
Materials Science
17 pages including 4 figures. Manuscript has been submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.73.165328
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.
Akimov Alexey V.
Bayer Manfred
Merkulov I. A.
Molenkamp Laurens W.
Scherbakov Vladimir A.
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