Spin Wave Theory of Double Exchange Magnets

Details Spin Wave Theory of Double Exchange Magnets Spin Wave Theory of Double Exchange Magnets

1999-09-14

arxiv.org/abs/cond-mat/9909213v3

J. Appl. Phys. vol. 87, 5804-5806 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, Latex-Revtex, 1 PostScript figure. Minor revisions, references added, to be published in J. Appl. Phys

Scientific paper

10.1063/1.372528

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.

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