This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-05907 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.130.246701 in citations.
Long-Range Orbital Torque by Momentum-Space Hotspots
Long-Range Orbital Torque by Momentum-Space Hotspots
While it is often assumed that the orbital response is suppressed and short ranged due to strong crystal field potential and orbital quenching, we show that the orbital response can be remarkably long ranged in ferromagnets. In a bilayer consisting of a nonmagnet and a ferromagnet, spin injection fr...
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Personal Name(s): | Go, Dongwook (Corresponding author) |
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Jo, Daegeun / Kim, Kyoung-Whan / Lee, Soogil / Kang, Min-Gu / Park, Byong-Guk / Blügel, Stefan / Lee, Hyun-Woo / Mokrousov, Yuriy | |
Contributing Institute: |
Quanten-Theorie der Materialien; PGI-1 JARA-FIT; JARA-FIT JARA - HPC; JARA-HPC Quanten-Theorie der Materialien; IAS-1 |
Published in: | Physical review letters, 130 (2023) 24, S. 246701 |
Imprint: |
College Park, Md.
APS
2023
|
DOI: |
10.34734/FZJ-2023-05907 |
DOI: |
10.1103/PhysRevLett.130.246701 |
Document Type: |
Journal Article |
Research Program: |
Statische und dynamische Kopplung von Gitter- und elektronischen Freiheitsgraden in magnetisch geordneten Übergangsmetalldichalkogenieden (B06) Spin+AFM-Dynamik: Antiferromagnetismus durch Drehimpulsströme und Gitterdynamik (A11) Topological Matter |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.130.246701 in citations.
While it is often assumed that the orbital response is suppressed and short ranged due to strong crystal field potential and orbital quenching, we show that the orbital response can be remarkably long ranged in ferromagnets. In a bilayer consisting of a nonmagnet and a ferromagnet, spin injection from the interface results in spin accumulation and torque in the ferromagnet, which rapidly oscillate and decay by spin dephasing. In contrast, even when an external electric field is applied only on the nonmagnet, we find substantially long-ranged induced orbital angular momentum in the ferromagnet, which can go far beyond the spin dephasing length. This unusual feature is attributed to nearly degenerate orbital characters imposed by the crystal symmetry, which form hotspots for the intrinsic orbital response. Because only the states near the hotspots contribute dominantly, the induced orbital angular momentum does not exhibit destructive interference among states with different momentum as in the case of the spin dephasing. This gives rise to a distinct type of orbital torque on the magnetization, increasing with the thickness of the ferromagnet. Such behavior may serve as critical long-sought evidence of orbital transport to be directly tested in experiments. Our findings open the possibility of using long-range orbital response in orbitronic device applications. |