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Regensburg 2004 – scientific programme

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MA: Magnetismus

MA 27: Spinabh
ängiger Transport II

MA 27.13: Talk

Thursday, March 11, 2004, 18:15–18:30, H22

Persistent Spin Currents in Helimagnets — •Jürgen König1, Jan Heurich2, and Allan H. MacDonald31Institut für Theoretische Physik III, Ruhr-Universität Bochum — 2Institut für Theoretische Festkörperphysik, Universität Karlsruhe — 3Department of Physics, University of Texas at Austin

We study collective spin transport in helimagnets, e.g., in systems with ground states that possess spiral magnetic order. It is demonstrated that weak external magnetic fields generate dissipationless spin currents in these systems, whereas the spiral ground state in the absence of a magnetic field does not support collective spin transport. Our conclusions are based on phenomenological considerations and on microscopic mean-field theory calculations for an illustrative toy model [1]. We discuss similarities and differences of these results to our recent analysis of spin supercurrents in thin film ferromagnets [2], and we speculate on possible applications of this effect in spintronic devices.
[1] J. Heurich, J. König, and A.H. MacDonald, Phys. Rev. B 68, 064406 (2003).
[2] J. König, M.C. Bønsager, and A.H. MacDonald, Phys. Rev. Lett. 87, 187202 (2001).

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