Observation of Skyrmions in Mn-Pt-Sn based Heusler material

Mn2YZ based Heusler materials often exhibit collinear spin alignment[1]. However, in a recent work we found Mn2RhSn displays a non-collinear magnetic structure[2]. The presence of noncollinear spin alignment with lack of inversion symmetry sets up a perfect condition for skyrmions in Mn2RhSn. However, experimentally it is still to be verified. To find skyrmions in Heusler system we search for materials with large spin-orbit coupling and lack of inversion symmetry. Here we present the experimental evidence of skyrmions in Mn-Pt-Sn Heusler compound. This sample shows an order-disorder transition around 400 K, followed by a spin-reorientation transition at low temperature. Our magnetization and ac-susceptibility measurements display a similar type of behavior that generally found in the skyrmion system. We have performed high resolution Lorentz transmission electron microscopy measurements to get a direct evidence of skyrmions in Mn-Pt-Sn sample. Our results show evolution of skyrmions in particular fields and temperature intervals.\\[4pt] [1] A. K. Nayak, et al., Phys. Rev. Lett. 110, 127204 (2013).\\[0pt] [2] O. Meshcheriakova, et al., Phys. Rev. Lett. 113, 08720(2014).