Spin Wave Propagation in the Domain State of a Random Field Magnet

Details Spin Wave Propagation in the Domain State of a Random Field Magnet Spin Wave Propagation in the Domain State of a Random Field Magnet

2002-02-02

arxiv.org/abs/cond-mat/0202038v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures. Minor revisions made to text; figures and references corrected

Scientific paper

10.1140/epjb/e2003-00099-1

Inelastic neutron scattering with high wave-vector resolution has characterized the propagation of transverse spin wave modes near the antiferromagnetic zone center in the metastable domain state of a random field Ising magnet. A well-defined, long wavelength excitation is observed despite the absence of long-range magnetic order. Direct comparisons with the spin wave dispersion in the long-range ordered antiferromagnetic state reveal no measurable effects from the domain structure. This result recalls analogous behavior in thermally disordered anisotropic spin chains but contrasts sharply with that of the phonon modes in relaxor ferroelectrics.

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