Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 39: Spin Structures/ Skyrmions (jointly with MA)

TT 39.5: Hauptvortrag

Mittwoch, 16. März 2011, 16:00–16:30, HSZ 04

Magnetoelectric effects in non-collinear magnets — •Maxim Mostovoy — Zernike Institute for Advanced Materials, University of Groningen, The Netherlands

The coupling of the electric field to the spin degrees of freedom in Mott insulators leads to a variety of spectacular phenomena in multiferroic materials, such as the magnetic field control of electric polarization in spiral magnets, the clamping between the ferroelectric and (anti)ferromagnetic domain walls in orthorhombic and hexagonal manganites and the excitation of magnons by the electric component of light (electromagnon peaks). The microscopic mechanisms of magnetoelectric coupling also allow for the electric field control of non-collinear spin structures in conventional magnets, which may find applications in spintronics. I will discuss the relevance of unusual magnetic multipoles, such as the monopole and toroidal moments, for the linear magnetoelectric effect and electromagnon excitation. I will also discuss the new dynamic magnetoelectric interaction, which can be used to move non-collinear spin textures in ferromagnets with an applied electric field. The effect of this coupling is dramatically enhanced for non-coplanar topological magnetic defects, such as magnetic vortices and Skyrmions.