Theory of spin-torque ferrimagnetic resonance

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We report a theory of spin-torque-induced magnetic resonance in collinear ferrimagnets, i.e., spin-torque ferrimagnetic resonance (ST-FiMR). We find that the rectified DC voltage of ST-FiMR has several distinct features as compared to spin-torque ferromagnetic resonance (ST-FMR) signals. The most important feature of the ST-FiMR signal is that its magnitude due to dampinglike spin-orbit torque is almost linearly proportional to the net spin density, and thus its sign changes near the angular momentum compensation condition. Our result suggests that the conventional ST-FMR line-shape analysis is unable to correctly estimate the magnitude and sign of spin-orbit torque for compensated ferrimagnets. Therefore, the analysis based on the ST-FiMR theory, of which a complete analytic expression is provided in this work, must be applied.
Publisher
AMER PHYSICAL SOC
Issue Date
2021-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW B, v.104, no.2, pp.024405

ISSN
2469-9950
DOI
10.1103/PhysRevB.104.024405
URI
http://hdl.handle.net/10203/286742
Appears in Collection
PH-Journal Papers(저널논문)
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