Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Skyrmions II (joint session MA/TT/KFM)

MA 19.11: Vortrag

Dienstag, 13. März 2018, 12:30–12:45, EB 301

Topological Hall effect in Heusler compound Mn_1.4PtSn — •Praveen Vir, Nitesh Kumar, Chandra Shekhar, and Claudia Felser — Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany

Skyrmions are topologically stable vortex-like spin structure which are considered as potential candidate for future high density memory devices. They have been detected in many chiral and polar compounds such as MnSi, FeGe, Co-Mn-Zn, GaV₄S₈ etc. Recently, with the help of Lorentz transmission electron microscopy, one new vortex like spin structure, so called antiskyrmions have been discovered in Mn-based tetragonal Heusler compound Mn_1.4PtSn and Mn_1.4Pt_0.9Pd_0.1Sn [1]. Antiskyrmion has been predicted to be anti-particle of Néel or Bloch type skyrmions becuase they annihilate with conventional skyrmions [2]. They are also topologically stable and consist of topological winding number or skyrmion number +1 [3]. Due to this topologically stable spin nature, it can give rise to non-vanishing Berry phase in real space. In other words, there could be nonzero topological Hall effect. Here, we report large topological Hall effect in single crystal of antiskyrmion hosting compounds Mn_1.4PtSn.