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Tesařová, N.; Butkovičová, D.; Campion, R.P.; Rushforth, A.W.; Edmonds, K.W.; Wadley, P.; Gallagher, B.L.; Schmoranzerová, E.; Trojánek, F.; Malý, P.; Motloch, P.; Novák, V.; Jungwirth, T.; Němec, P. (2014)
Publisher: American Physical Society
Languages: English
Types: Article
Subjects: Condensed Matter - Materials Science

Classified by OpenAIRE into

arxiv: Condensed Matter::Materials Science
We report on the determination of micromagnetic parameters of epilayers of the ferromagnetic semiconductor (Ga,Mn)As, which has an easy axis in the sample plane, and (Ga,Mn)(As,P), which has an easy axis perpendicular to the sample plane.We use an optical analog of ferromagnetic resonancewhere the laser-pulse-induced precession of magnetization is measured directly in the time domain. By the analysis of a single set of pump-and-probe magneto-optical data, we determined the magnetic anisotropy fields, the spin stiffness, and the Gilbert damping constant in these two materials. We show that incorporation of 10% of phosphorus in (Ga,Mn)As with 6% of manganese leads not only to the expected sign change of the perpendicular-to-plane anisotropy field but also to an increase of the Gilbert damping and to a reduction of the spin stiffness. The observed changes in the micromagnetic parameters upon incorporating P in (Ga,Mn)As are consistent with the reduced hole density, conductivity, and Curie temperature of the (Ga,Mn)(As,P) material.We also show that the apparent magnetization precession damping is stronger for the n=1 spinwave resonance mode than for the n=0 uniform magnetization precession mode.
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