Photo-induced precession of magnetization in ferromagnetic (Ga,Mn)As

Abstract

Precession of magnetization induced by pulsed optical excitation is observed in a ferromagnetic semiconductor (Ga,Mn)As by time-resolved magneto-optical measurements. It appears as complicated oscillations of polarization plane of linearly-polarized probe pulses, but is reproduced by gyromagnetic theory incorporating an impulsive change in an effective magnetic field due to changes in magnetic anisotropy. It is inferred from the shape of the impulse that the changes in anisotropy result from non-equilibrium carrier population: cooling of hot photo-carriers and subsequent annihilation of photo-carriers.

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Cited by in corpus (33)

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• Coherent manipulation of magnetization precession in ferromagnetic semiconductor (Ga,Mn)As with successive optical pumping
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• Enhancement of intrinsic magnetic damping in defect-free epitaxial Fe3O4 thin films
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• Optical spin transfer and spin-orbit torques in thin film ferromagnets
• Effect of magnetic anisotropy relaxation on laser-induced magnetization precession in thin galfenol films
• Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling
• Ultrafast spin dynamics in II-VI diluted magnetic semiconductors with spin-orbit interaction
• Broadband ferromagnetic resonance characterization of GaMnAs thin films
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• Comparison of micromagnetic parameters of ferromagnetic semiconductors (Ga,Mn)(As,P) and (Ga,Mn)As
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• Laser-induced Precession of Magnetization in GaMnAs
• Dynamical Corrections to Spin Wave Excitations in Quantum Wells due to Coulomb Interactions and Magnetic Ions
• Collective magnetization dynamics in ferromagnetic (Ga,Mn)As mediated by photo-excited carriers
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• Investigation of Optical Spin Transfer Torque in Ferromagnetic Semiconductor GaMnAs by Magneto-Optical Pump-and-Probe Method