Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Spin Hall Effects and Skyrmions I
MA 47.13: Vortrag
Donnerstag, 23. März 2017, 12:45–13:00, HSZ 04
Skyrmions with attractive interactions in an ultrathin magnetic film — •Levente Rózsa1,4, András Deák2, Eszter Simon2, Rocio Yanes3, László Udvardi2, László Szunyogh2, and Ulrich Nowak3 — 1Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Universität Konstanz, Konstanz, Germany — 4Universität Hamburg, Hamburg, Germany
Magnetic skyrmions in ultrathin films, corresponding to localized noncollinear spin structures, hold promising aspects in future data storage and spintronics applications[1]. Besides chiral skyrmions stabilized by the Dzyaloshinsky–Moriya interaction, the frustration of the isotropic exchange interactions may also lead to the formation of skyrmions[2]. We performed ab initio electronic structure calculations to determine the parameters in a classical spin Hamiltonian describing an Fe monolayer on Pd(111) surface with a Pt1−xIrx alloy overlayer. We demonstrate that increasing the Ir concentration x transforms the ground state from ferromagnetic into a spin spiral state, primarily due to the increased frustration of the isotropic exchange interactions. Using spin dynamics simulations, we show that the isolated skyrmions observed in the collinear phase form clusters due to the short-range attractive interaction between them, and that these clusters remain stable against thermal fluctuations[3].
[1] A. Fert et al., Nat. Nanotech. 8, 152 (2013).
[2] A. O. Leonov et al., Nat. Commun. 6, 8275 (2015).
[3] L. Rózsa et al., Phys. Rev. Lett. 117, 157205 (2016).