Spin Wave Theory of Double Exchange Magnets

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.

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

Cited by in corpus (8)

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• Magnetic Domain Walls in Single-Phase and Phase-Separated Double Exchange Systems
• Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets
• Spin Dynamics of Double-Exchange Manganites with Magnetic Frustration
• Order from disorder in the double-exchange model
• Double Exchange in a Magnetically Frustrated System