2008/05/31 by Myron D. Kapetanakis, M. D. Kapetanakis, I. E. Perakis · 1 citation
Materials Science · Physics and Astronomy · #Magnetic properties of thin films #Quantum and electron transport phenomena #ZnO doping and properties #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.101.097201
published as PRL 101, 097201 (2008) · 4 pages, 3 figures, content and figures changed, published in Phys. Rev. Lett
arxiv created 2008/08/25 · openalex publication_date 2008/08/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.