Spin Wave Theory of Double Exchange Magnets
Strongly Correlated Electrons
2009-10-31 v3 Materials Science
Abstract
An isotropic half-metallic double exchange magnet with a direct superexchange coupling between the localized spins is studied within the spin-wave (1/S) expansion. The momentum dependence of the spin wave spectrum (including quantum corrections) in the ferromagnetic phase at T=0 is investigated. Based on the calculated spin wave spectrum of the canted state, it is shown that as long as the external magnetic field is not too strong, the double exchange -- superexchange competition does not result in a stabilization of a two-sublattice canted spin ordering.
Cite
@article{arxiv.cond-mat/9909213,
title = {Spin Wave Theory of Double Exchange Magnets},
author = {D. I. Golosov},
journal= {arXiv preprint arXiv:cond-mat/9909213},
year = {2009}
}
Comments
4 pages, Latex-Revtex, 1 PostScript figure. Minor revisions, references added, to be published in J. Appl. Phys