Observation of long-range orbital transport and giant orbital torque

Hiroki Hayashi, Daegeun Jo, Dongwook Go, Tenghua Gao, Satoshi Haku, Yuriy Mokrousov, Hyun Woo Lee, Kazuya Ando

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Modern spintronics relies on the generation of spin currents through spin-orbit coupling. The spin-current generation has been believed to be triggered by current-induced orbital dynamics, which governs the angular momentum transfer from the lattice to the electrons in solids. The fundamental role of the orbital response in the angular momentum dynamics suggests the importance of the orbital counterpart of spin currents: orbital currents. However, evidence for its existence has been elusive. Here, we demonstrate the generation of giant orbital currents and uncover fundamental features of the orbital response. We experimentally and theoretically show that orbital currents propagate over longer distances than spin currents by more than an order of magnitude in a ferromagnet and nonmagnets. Furthermore, we find that the orbital current enables electric manipulation of magnetization with efficiencies significantly higher than the spin counterpart. These findings open the door to orbitronics that exploits orbital transport and spin-orbital coupled dynamics in solid-state devices.

Original languageEnglish
Article number32
JournalCommunications Physics
Volume6
Issue number1
DOIs
Publication statusPublished - 2023 Dec

ASJC Scopus subject areas

  • General Physics and Astronomy

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