Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Skyrmions II (joint session MA/TT/KFM)

TT 37.4: Vortrag

Dienstag, 13. März 2018, 10:15–10:30, EB 301

Temperature dependence of the cubic anisotropy in the room-temperature skyrmion host Co₉Zn₉Mn₂ — •Bertalan György Szigeti¹, Dieter Ehlers², Kosuke Karube³, István Kézsmárki², Hans-Albrecht Krug von Nidda², Markus Preissinger², Vladimir Tsurkan², Yusuke Tokunaga³, Yasujiro Taguchi³, and Yoshinori Tokura³ — ¹Department of Physics, Budapest University of Technology and Economics,1111 Budapest, Hungary — ²Experimental Physik V, EKM, Universität Augsburg, 86135 Augsburg — ³RIKEN Centre for Emergent Matter Science (CEMS), Wako 351-0198, Japan

The β-Mn-type Co-Zn-Mn alloys are cubic chiral room temperature skyrmion hosts already studied by Lorentz transmission electron microscopy, magnetization and small-angle neutron scattering[1]. Spin wave spectroscopy of the Dzyaloshinskii-Moriya interaction has been measured for Co₈Zn₈Mn₄ and Co₉Zn₉Mn₂[2]. Co₉Zn₉Mn₂ can host metastable skyrmions in zero magnetic field below its T_C≈ 400 K Curie-temperature[3]. In this work we present ESR measurements in the field polarized state of Co₉Zn₉Mn₂ to investigate the temperature dependence of the cubic magnetocrystalline anisotropy and its influence on the properties of the meta-stable skyrmion lattice state. We found strong correlation between the change in the anisotropy and the trigonal to square lattice transformation of the skyrmion state.

[1] Tokunaga, Y., et al., Nat. Commun. 6, 7638 (2015), [2] Takagi, R., et al., Phys. Rev. B 95, 220406 (2017), [3] Karube, K., et al., arXiv:1709.08047 (2017).