Journal
JOURNAL OF SUPERCONDUCTIVITY
Volume 18, Issue 1, Pages 9-13Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10948-005-2142-z
Keywords
III-V-based magnetic semi conductors; photoinduced magnetization rotation; magnetization precession; magnetic anisotropy
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Dynamics of photoinduced magnetization have been studied in ferromagnetic semiconductor (Ga,Mn)As thin films by time-resolved polar Kerr rotation. Ultrafast (similar to 150 fs) magnetization rotation has been realized using both chirality of excitation light and p-d exchange interaction. We also report on the occurrence of photoinduced magnetization precession in longer time domain. This is initiated by a change in hole concentration and resultant change in magnetic anisotropy. The overall behaviors of these photoinduced magnetization dynamics are discussed.
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