Physics – Condensed Matter – Materials Science
Scientific paper
2011-01-05
Physics
Condensed Matter
Materials Science
14 pages, 4 figures, plus supplementary material
Scientific paper
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.
Cukr M.
Jungwirth Tomas
Maly Petr
Nemec Petr
Novak Vaclav
No associations
LandOfFree
Non-thermal laser induced precession of magnetization in ferromagnetic semiconductor (Ga,Mn)As does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Non-thermal laser induced precession of magnetization in ferromagnetic semiconductor (Ga,Mn)As, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-thermal laser induced precession of magnetization in ferromagnetic semiconductor (Ga,Mn)As will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-267576