Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Spin Structures at Surfaces and in thin films I (Skyrmions)

MA 45.13: Vortrag

Donnerstag, 3. April 2014, 18:15–18:30, BEY 118

The role of cubic and exchange anisotropies in the thermodynamical stability of skyrmions and half-skyrmions in cubic helimagnets — •Andrey Leonov¹ and Ulrich K. Rößler² — ¹Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — ²IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

In non-centrosymmetric chiral magnets, isotropic Dzyaloshinskii-Moriya interactions induce long-range 1-dimensional (cones and helicoids) and 2-dimensional (±π-skyrmions and π/2-skyrmions) homochiral modulations of the magnetization [1]. In this contribution we investigate the role of small anisotropic forces as cubic anisotropy and anisotropic exchange in suppression of the conical phase and the thermodynamical stability of skyrmions [2]. We also consider reorientational effect of cubic anisotropy on the propagation direction of helicoids and axes of skyrmions along certain crystal directions. The constructed T-H phase diagrams hold existence regions for different modulated and homogeneous phases separated by first- and second-order transition lines. The results demonstrate that a plethora of different precursor phenomena, modulated mesophases, and reorientation transitions may arise in cubic helimagnets near magnetic ordering depending on very weak magnetic couplings. [1] U. K. Rößler et al., J. of Phys.: Conf. Ser. 303, 012105 (2011); [2] A. Leonov, Ph.D thesis, Dresden University of Technology, Dresden (2012).