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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.