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In ferromagnets , the magnetization is uniform in space.

Breakdown of Hydrodynamics in Helimagnets D. Belitz, University of Oregon, DMR-0529966 T.R. Kirkpatrick, Univ. of Maryland, DMR-0530314. In ferromagnets , the magnetization is uniform in space.

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In ferromagnets , the magnetization is uniform in space.

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  1. Breakdown of Hydrodynamics in HelimagnetsD. Belitz, University of Oregon, DMR-0529966T.R. Kirkpatrick, Univ. of Maryland, DMR-0530314 • In ferromagnets, the magnetization is uniform in space. • In helimagnets, e.g., MnSi, the magnetization rotates in planes perpendicular to a helical axis with a pitch wave number q. • This leads to an anisotropic dispersion relation for helical spin waves, • which are softer in the direction transverse to the helical axis than in the longitudinal one. • As a result of the soft transverse fluctuations, the elastic constants and diverge at very long time or length scales, so do the damping coefficients for the spin waves, and the helical order is destroyed. • This breakdown of hydrodynamics is analogous to the situation in chiral liquid crystals. Schematic visualization of longitudinal (left) and transverse (right) helical spin waves. Conclusion: Analogies between soft condensed matter and magnets lead to a breakdown of traditional concepts of long-range order and excitations.

  2. Breakdown of Hydrodynamics in HelimagnetsD. Belitz, University of Oregon, DMR-0529966T.R. Kirkpatrick, Univ. of Maryland, DMR-0530314 Community Service: Education, and Development of Human Resources: • Qi Li, current graduate student • Kuan-Yuet Ho, current graduate student • Ronojoy Saha, current postdoc • Lubo Zhou, current graduate student Our collaborative research project supported by the two grants fosters close contact between our respective groups, with interactions between, and exchange of, students, postdocs, and visitors. Current personnel supported, in full or in part, by the grants include • PI Kirkpatrick serves as Divisional Associate Editor for Physical Review Letters, and as an editor for the electronic journal, JSTAT. • PI Belitz serves as Associate Editor for Condensed Matter Theory for Reviews of Modern Physics.

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