[16p-Z19-1~23] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

△ [16p-Z19-18] Magnetic phase diagram of room temperature skyrmion in Fe_2-xPd_xMo₃N epitaxial thin films

〇(D)Hirobumi Kyo¹, Nobutaka Togashi¹, Shuhei Momose¹, Soushi Wada¹, Takeru Fukazawa¹, Tetsuya Hajiri¹, Makoto Kuwahara¹, Hidefumi Asano¹ (1.Nagoya Univ.)

Keywords:Skyrmion, Topological Hall effect, Lorentz TEM

Skyrmions induced by the Dzyaloshinskii–Moriya (DM) interaction have the great potential for spintronic applications, owing to emergent electromagnetic phenomena, and ultra-low current driven motion. Although near room temperature skyrmions were reported for B20-type FeGe (ferromagnetic Curie temperature T_C = 278 K)¹, β-Mn type Co_xZn_yMn_z (T_C = 420 K)² and tetragonal Heusler Mn_1.4Pt_1-yRh_ySn (T_C = 390 K)³, their skyrmion sizes were found to be relatively large around 100 nm. It is of particular importance to develop new materials that exhibited skyrmions with small skyrmion sizes at and above room temperature. In this study, we focused on β-Mn type nitride A₂Mo₃N, because skyrmion phase was observed at 100 K by Lorenz transmission electron microscopy (LTEM) in Fe_xCo_1.5-xRh_0.5Mo₃N (x = 0.3 and 0.5)⁴. We prepared the epitaxial A₂Mo₃N films and investigated the effects of multi doping of A site on magnetic properties as well as the appearance of skyrmion phases.

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