Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As

Tesařová, N. and Butkovičová, D. and Campion, R. P. and Rushforth, A. W. and Edmonds, K. W. and Wadley, P. and Gallagher, B. L. and Schmoranzerová, E. and Trojánek, F. and Malý, P. and Motloch, P. and Novák, V. and Jungwirth, T. and Němec, P. (2014) Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As. Physical Review B, 90 . 155203/1-155203/12. ISSN 1098-0121

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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.

Item Type: Article
Additional Information: Comparison of micromagnetic parameters of the ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As, N. Tesarova, D. Butkovicova, R.P. Campion, A.W. Rushforth, K.W. Edmonds, P. Wadley, B.L. Gallagher, E. Schmoranzerova, F. Trojanek, P. Maly, P. Motloch, V. Novak, T. Jungwirth, and P.Nemec. Physical Review B 90, 155203 (2014)
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Physics and Astronomy
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Depositing User: Rushforth, Andrew
Date Deposited: 23 Jun 2016 13:19
Last Modified: 14 Sep 2016 01:15

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