Journal
IEEE TRANSACTIONS ON MAGNETICS
Volume 46, Issue 6, Pages 2470-2473Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2010.2042289
Keywords
Ferromagnetic materials; interface phenomena; magnetic semiconductors; manganese compounds; optical Kerr effect; ultrafast optics
Funding
- MEXT [19048020]
- Global Center of Excellence Program
- Grants-in-Aid for Scientific Research [19048020] Funding Source: KAKEN
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Photo-induced precession of magnetization in (Ga, Mn) As was studied for samples having metal (Pt and Fe) overlayers on (Ga, Mn) As epilayers. It has been found, for both structures, that an increase in the thickness of metal layers results in the reduced effective magnetic field and enhanced Gilbert damping constant. It has been shown experimentally that direct contact between metals and (Ga, Mn) As is the necessary condition to cause the observed phenomena. Spin pumping effect may be the relevant mechanism, but overall behavior is not fully explainable with simple pictures.
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