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MA: Fachverband Magnetismus

MA 24: Magnetic Heusler Compounds

MA 24.5: Vortrag

Dienstag, 17. März 2020, 10:30–10:45, HSZ 403

Probing the spin textures by topological Hall effect in tetragonal inverse Heusler compounds — •Vivek Kumar^1,2, Nitesh Kumar¹, Manfred Reehuis³, Jacob Gayles¹, Chandra Shekhar¹, Peter Adler¹, and Claudia Felser¹ — ¹Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany — ²Technische Universität München, München, Germany — ³Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

Heusler compounds having D_2d crystal symmetry gained much attention recently due to the stabilization of a vortex-like spin texture called antiskyrmions in thin lamellae of Mn_1.4Pt_0.9Pd_0.1Sn [1]. Here we present that bulk Mn_1.4Pt_0.9Pd_0.1Sn undergoes a spin-reorientation transition from a collinear ferromagnetic to a non-collinear configuration of Mn moments below 135 K, which is accompanied by the emergence of a topological Hall effect. A unique feature of the present system is the observation of a zero-field topological Hall resistivity with a sign change which indicates the robust formation of antiskyrmions. Additionally, we investigate the two series of Heusler compounds Mn_1.4Pt_1−xPd_xSn (0 ≤ x ≤ 0.3) and Mn_1.4Pt_1−yRh_ySn (0.1 ≤ y ≤ 0.8). Our results demonstrate the tunability of topological spin textures in the Heusler system which paves the way for systematic design of antiskyrmion phase containing compounds suitable for applications in spintronics. [1]Nayak et al., Nature 548, 561 (2017).