Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Magnetic Thin Films II of 2
MA 27.2: Vortrag
Mittwoch, 13. März 2013, 15:15–15:30, H3
Magnetic domain walls and thermally-excited spin waves in single-chain magnets and ferromagnetic thin films — •Alessandro Vindigni1, Thomas T. Micheals1, Boris Sangiorgio1, Orlando V. Billoni2, Rodolphe Clérac3, Hitoshi Miyasaka4, Niculin Saratz1, Urs Ramsperger1, and Danilo Pescia1 — 1Laboratory for Solid State Physics, ETH Zurich, Switzerland — 2Facultad de Matematica, Astronomia y Fisica, Universidad National de Cordoba (AR) — 3CNRS, Centre de Recherche Paul Pascal (CRPP), Pessac, France — 4Graduate School of Natural Science and Technology, Kanazawa University, Japan
Several properties of magnetic materials are determined by domain-walls (DWs) and their structure. In many fundamental and applicative contexts, modeling a DW with a (Walker) profile which solely depends on one spatial variable suffices to capture the essential physics. Though somewhat forgotten, it has been known since the eighties that spin waves propagating through such a DW are expected to acquire a phase shift. Besides those traveling waves, an additional eigenmode of the linearized Landau-Lifshitz equation is a “bound state”, localized right at the DW center. These distinctive features make spin-wave renormalization act differently in the presence of DWs with respect to the standard case in which the magnetization is assumed to be spatially homogeneous. The two alternative treatments yield different predictions, which are discussed in relationship with experiments on molecular spin chains and ultra-thin magnetic films.