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MA: Fachverband Magnetismus

MA 33: Surface Magnetism II (jointly with O)

MA 33.9: Vortrag

Mittwoch, 9. März 2016, 17:15–17:30, H31

Monte Carlo study of chiral magnetic structures in transition-metal multilayers — •Marie Böttcher, Bertrand Dupé, and Stefan Heinze — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Leibnizstr. 15, 24118 Kiel, Germany

Due to their unique topological and dynamical properties and hence the possible application in data storage devices [1], chiral magnetic structures, such as skyrmions, have recently received a lot of interest. One of the main challenges is the stabilization of skyrmions at room temperature. To study the temperature dependence, we performed parallel tempering Monte Carlo (MC) [2] simulations. The advantage of this method is the possibility to overcome local energy minima via temperature and sample large volumes of the phase space. In order to increase the critical temperature of skyrmion systems, we explore transition-metal multilayers built from a repetition of atomic and biatomic layers of Pd, Fe and Ir [3]. We show that the critical temperature in these systems can be significantly enhanced by the interlayer exchange coupling between adjacent Fe bilayers in the multilayer structure. An increase of the exchange coupling in multilayers which may be achieved, e.g. by varying the number or species of 4d or 5d layers within the multilayer, may even yield critical values close to room temperature.

[1] A. Fert et al., Nature Nanotechnology 8 (2013). [2] K. Hukushima and K. Nemoto, J. Phys. Soc. Japan 65 (1996). [3] B. Dupé et al., arXiv:1503.08098 (2015).