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- W4298889196 abstract "Non-thermal laser induced spin excitations, recently discovered in conventional oxide and metal ferromagnets, open unprecedented opportunities for research and applications of ultrafast optical manipulation of magnetic systems. Ferromagnetic semiconductors, and (Ga,Mn)As in particular, should represent ideal systems for exploring this new field. Remarkably, the presence of non-thermal effects has remained one of the outstanding unresolved problems in the research of ferromagnetic semiconductors to date. Here we demonstrate that coherent magnetization dynamics can be excited in (Ga,Mn)As non-thermally by a transfer of angular momentum from circularly polarized femtosecond laser pulses and by a combination of non-thermal and thermal effects due to a transfer of energy from laser pulses. The thermal effects can be completely suppressed in piezo-electrically controlled samples. Our work is based on pump-and-probe measurements in a large set of (Ga,Mn)As epilayers and on systematic analysis of circular and linear magneto-optical coefficients. We provide microscopic theoretical interpretation of the experimental results." @default.
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- W4298889196 date "2011-01-05" @default.
- W4298889196 modified "2023-09-27" @default.
- W4298889196 title "Non-thermal laser induced precession of magnetization in ferromagnetic semiconductor (Ga,Mn)As" @default.
- W4298889196 doi "https://doi.org/10.48550/arxiv.1101.1049" @default.
- W4298889196 hasPublicationYear "2011" @default.
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