[22p-E205-1~16] 10.1 新物質・新機能創成（作製・評価技術）

▼ [22p-E205-7] Annealing temperature dependence of thermo-spin and magneto-thermoelectric conversion in Co₂MnGa films on Y₃Fe₅O₁₂ and Gd₃Ga₅O₁₂

〇Hayato Mizuno¹、Rajkumar Modak¹、Takamasa Hirai¹、Atsushi Takahagi²、Yuya Sakuraba¹、Ryo Iguchi¹、Ken-ichi Uchida^1,3,4 (1.NIMS、2.Nagoya Univ.、3.IMR Tohoku Univ.、4.CSRN Tohoku Univ.)

キーワード：Heusler alloy, Spin Peltier effect, Anomalous Ettingshausen effect

Magnetic Heusler alloys have been widely studied as promising spintronic and spin-caloritronic materials because they may show half metallic or topological properties. For instance, Co₂MnGa (CMG), a ferromagnetic full Heusler alloy, with the L2₁ ordered phase is known to exhibit the large anomalous Hall and anomalous Nernst effects due to the topological band structure. Recent studies show that CMG films with the L2₁ and B2 ordered phases also exhibit the large charge-to-spin current conversion efficiency. This finding suggests that CMG is useful for inducing thermo-spin effects, such as the spin Seebeck and spin Peltier effects, by forming CMG films on magnetic insulators, e.g., Y₃Fe₅O₁₂. To clarify the potential of CMG as a spin-caloritronic material, in this study, we have characterized the structural and magnetic properties of CMG films grown on Y₃Fe₅O₁₂ and Gd₃Ga₅O₁₂ substrates at different annealing temperatures. By means of the lock-in thermography technique, we have also investigated the thermo-spin and magneto-thermoelectric conversion properties in the CMG/Y₃Fe₅O₁₂ and CMG/Gd₃Ga₅O₁₂ hybrid systems.