Spin dynamics in (III,Mn)V ferromagnetic semiconductors: the role of correlations

Abstract

We address the role of correlations between spin and charge degrees of freedom on the dynamical properties of ferromagnetic systems governed by the magnetic exchange interaction between itinerant and localized spins. For this we introduce a general theory that treats quantum fluctuations beyond the Random Phase Approximation based on a correlation expansion of the Green's function equations of motion. We calculate the spin susceptibility, spin--wave excitation spectrum, and magnetization precession damping. We find that correlations strongly affect the magnitude and carrier concentration dependence of the spin stiffness and magnetization Gilbert damping.

4 pages, 3 figures, content and figures changed, published in Phys. Rev. Lett

References in corpus (8)

• Theory of ferromagnetic (III,Mn)V semiconductors
• Impurity Band Conduction in a High Temperature Ferromagnetic Semiconductor
• Ultrafast Enhancement of Ferromagnetism via Photoexcited Holes in GaMnAs
• Ultrafast demagnetization in the sp-d model: a theoretical study
• Ellipsometric study of the Electronic Structure of GaMnAs and LT-GaAs
• Coherent Magnetization Precession in GaMnAs induced by Ultrafast Optical Excitation
• Femtosecond Control of the Magnetization in Ferromagnetic Semiconductors
• Non--Heisenberg Spin Dynamics of Double-Exchange Ferromagnets with Coulomb Repulsion

Cited by in corpus (5)

• Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets
• Manipulating Femtosecond Spin--Orbit Torques with Laser Pulse Sequences to Control Magnetic Memory States and Ringing
• Influence of non-magnetic impurity scattering on the spin dynamics in diluted magnetic semiconductors
• Magnetization Relaxation and Collective Spin Excitations in Correlated Double--Exchange Ferromagnets
• Pitfalls in the theory of carrier dynamics in semiconductor quantum dots: the single-particle basis vs. the many-particle configuration basis