講演情報
[16p-S4_201-11]Thermally Excited Magnon Transport in Spin-Compensated Orbital Ferrimagnet CoMnO3
〇(M2)Tatsuki Onuma1, Hideto Yanagihara1 (1.Univ. of Tsukuba)
キーワード：
orbital ferrimagnet、magnon、spin Seebeck effect
This study investigates thermally excited angular momentum transport in the orbital ferrimagnet CoMnO3 (CMO), where spin magnetization is compensated and net magnetization originates from orbital magnetic moments. While the spin Seebeck effect enables charge-free spin transport via thermally excited magnons, orbitronics utilizing orbital angular momentum has emerged as a promising frontier. However, understanding of orbital transport in localized electron systems remains unclear. This research aims to elucidate the role of orbital degrees of freedom in magnetic insulators by observing the spin-orbital Seebeck effect at the CMO/NM interface.
Second-harmonic Hall measurements on CMO/NM (NM: Pt or Ru) bilayers revealed clear signals in Pt samples proportional to temperature gradients and consistent with CMO magnetization, while Ru samples showed negligible signals, indicating angular momentum converts to voltage through inverse spin Hall effect. The Pt thickness dependence was well explained by conventional spin transport models, suggesting magnon-mediated spin transport dominates within CMO.
Second-harmonic Hall measurements on CMO/NM (NM: Pt or Ru) bilayers revealed clear signals in Pt samples proportional to temperature gradients and consistent with CMO magnetization, while Ru samples showed negligible signals, indicating angular momentum converts to voltage through inverse spin Hall effect. The Pt thickness dependence was well explained by conventional spin transport models, suggesting magnon-mediated spin transport dominates within CMO.