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Light-Induced Magnetic Precession in (Ga,Mn)As Slabs: Hybrid Standing-Wave Damon-Eshbach Modes

D. M. Wang·Y. H. Ren·X. Liu·J. K. Furdyna·M. Grimsditch·R. Merlin
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Abstract

Coherent oscillations associated with spin precessions were observed in ultrafast optical experiments on ferromagnetic (Ga,Mn)As films. Using a complete theoretical description of the processes by which light couples to the magnetization, values for the exchange and anisotropy constants were obtained from the field-dependence of the magnon frequencies and the oscillation-amplitude ratios. Results reveal a relatively large negative contribution to the energy due to surface anisotropy leading to excitations that are a mixture of bulk waves and surface modes.

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D. M. Wang, Y. H. Ren, X. Liu, J. K. Furdyna, M. Grimsditch, R. Merlin. 2006-09-25. Light-Induced Magnetic Precession in (Ga,Mn)As Slabs: Hybrid Standing-Wave Damon-Eshbach Modes. https://doi.org/10.1103/physrevb.75.233308

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