[19p-D104-7~21] 10.1 新物質・新機能創成（作製・評価技術）

▼ [19p-D104-17] Investigation of spin-transfer properties in ferrimagnetic Mn₄N nanowires

〇Toshiki Gushi^1,2、Laurent Vila²、Jean-Philippe Attane²、Olivier Fruchart²、Alain Marty²、Stefania Pizzini³、Jan Vogel³、Fumiya Takata¹、Akihito Anzai¹、Takashi Suemasu¹ (1.Univ. of Tsukuba、2.SPINTEC、3.Institut Neel)

キーワード：Mn4N, Current induced domain wall motion, PMA

We are interested in Mn₄N film as a new spintronic material. In this paper, we characterized magnetic properties in Mn₄N nanowires, such as spin transfer efficiency ε, which is calculated by the equivalency between magnetic field and current density, the threshold current density j_th for domain wall (DW) motion without external field, and they were ε=7.7 pT/m², j_th=120 GA/m², respectively. In addition, the velocity of DW driven by pulse current of 5×10¹¹ A/m² was above 200 m/s in a preliminary experiment without any assistance of spin-orbit torque. These surprising properties obviously showed the potential of Mn₄N for appplication to current-induced DW motion devices.