Robust Antiskyrmion Phase in Bulk Tetragonal Mn-Pt(Pd)-Sn Heusler System Probed by Magnetic Entropy Change and AC-Susceptibility Measurements

Magnetic skyrmions, topologically protected chiral spin textures having potential applications in data storage, are stabilized in certain magnetic materials with broken inversion symmetry. The existence of magnetic antiskyrmions has been recently demonstrated in thin plates of a tetragonal Heusler material with D-2d crystal symmetry. Here, the robust nature of the antiskyrmion phase in bulk tetragonal Mn-Pt(Pd)-Sn compounds by utilizing magnetic entropy change and AC-susceptibility measurements is shown. It is found that the formation of the antiskyrmion phase is accompanied by a positive magnetic entropy change, which is supported by the concomitant observation of an anomaly in AC-susceptibility measurements. Supporting these findings, no anomalies are found in AC-susceptibility and magnetic entropy change measurements for a Mn-Pt(Pd)-Sn compound that is stabilized in the cubic phase by slight changes in chemical composition, thereby showing the robustness of the antiskyrmion phase to the D-2d crystal structure.