講演情報
[8p-E208-4]Observation of relativistic spin-orbit torques in a g-wave altermagnet CrSb
〇(P)Tianyi Ma1,2, Zhenchao Wen1, Jun Okabayashi3, Seiji Mitani1, Hiroaki Sukegawa1 (1.NIMS, 2.JSPS, 3.Univ. Tokyo)
キーワード：
altermagnet、CrSb、spin-orbit torque
In g-wave altermagnets, linear spin current Js generated from spin-splitting effect (SSE) is symmetry-forbidden, providing a unique platform for dierctly evaluating relativistic spin-current genereation mechanisms in altermagnets. Here, we successfully obtained epitaxial g-wave altermagnet CrSb(1210) thin film on W-buffered Al2O3(1210) substrates by magnetron cosputtering. The generation of Js in CrSb was studied through the spin-torque ferromagnetic resonance technique. Besides the conventional spin-Hall-effect (SHE) origin y-polarized (transverse to the charge current Jc direction) Js, a non-conventional x-polarized (parallel to Jc) Js was also observed. The amplitude of this x-polarized Js depended on the angle between Néel vector and Jc, which indicated a Néel vector dependent relativistic spin transport response in the eptixial CrSb. The observation of such unconventional spin transport highlighted the contribution of SOC-driven Js generation mechanisms in altermagnets, even in the absence of SSE-induced spin currents, and expended the range of candidates materials for efficient Js generation beyond d-wave altermagnets.