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

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

2008-05-09

arxiv.org/abs/0805.1320v2

PRL 101, 097201 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.101.097201

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.

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