Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets

Details Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets Spin Waves, Phase Separation, and Interphase Boundaries in Double Exchange Magnets

2001-10-16

arxiv.org/abs/cond-mat/0110322v2

J. Appl. Phys. vol. 91, pp. 7508-7510 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, LaTeX-Revtex, 2 PostScript figures; misprints corrected, including those in the published version

Scientific paper

10.1063/1.1448306

We study a classical double exchange magnet with direct antiferromagnetic superexchange coupling, J, between the localized spins. It is shown that the de-stabilization of the ferromagnetic ground state with increasing J leads to phase separation; the latter always preempts the spin-wave instability (softening of the magnon spectrum). It is also found that the boundaries separating the ferromagnetic and antiferromagnetic areas of the sample tend to be abrupt.

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