期刊
APPLIED PHYSICS LETTERS
卷 94, 期 14, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3116716
关键词
Curie temperature; ferromagnetic materials; gallium compounds; Kerr magneto-optical effect; magnetic relaxation; magnetic thin films; manganese compounds; semimagnetic semiconductors; spin dynamics; time resolved spectra
资金
- National Natural Science Foundation of China [1067 4130, 60836002]
- National Key Projects for Basic Research of China [2007CB924904]
- Chinese Academy of Sciences [KJCX2. YW. W09]
Spin dynamics in (Ga,Mn)As films grown on GaAs(001) was investigated by Time-resolved magneto-optical Kerr effect. The Kerr signal decay time of (Ga,Mn)As without external magnetic field applied was found to be several hundreds picoseconds, which suggested that photogenerated polarized holes and magnetic ions are coupled as a ferromagnetic system. Nonmonotonic temperature dependence of relaxation and dephasing (R&D) time and Larmor frequency manifests that Bir-Aronov-Pikus mechanism dominates the spin R&D time at low temperature, while D'yakonov-Perel mechanism dominates the spin R&D time at high temperature, and the crossover between the two regimes is Curie temperature.
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