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

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.

17 pages, 4 figures

References in corpus (2)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Reorientation Transition in Single-Domain (Ga,Mn)As

Cited by in corpus (7)

• Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As
• Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets
• Theory of spin waves in ferromagnetic (Ga,Mn)As
• Coherent manipulation of magnetization precession in ferromagnetic semiconductor (Ga,Mn)As with successive optical pumping
• Manipulating Femtosecond Spin--Orbit Torques with Laser Pulse Sequences to Control Magnetic Memory States and Ringing
• Collective magnetization dynamics in ferromagnetic (Ga,Mn)As mediated by photo-excited carriers
• Establishing micromagnetic parameters of ferromagnetic semiconductor (Ga,Mn)As