Microscopic evaluation of spin and orbital moment in ferromagnetic resonance

Yuta Ishii; Yuichi Yamasaki; Yusuke Kozuka; Jana Lustikova; Yoichi Nii; Yoshinori Onose; Yuichi Yokoyama; Masaichiro Mizumaki; Jun-Ichi Adachi; Hironori Nakao; Taka-Hisa Arima; Yusuke Wakabayashi

doi:10.1038/s41598-024-66139-1

Microscopic evaluation of spin and orbital moment in ferromagnetic resonance

Sci Rep. 2024 Jul 5;14(1):15504. doi: 10.1038/s41598-024-66139-1.

Authors

Yuta Ishii^{1

2}, Yuichi Yamasaki^{3

4}, Yusuke Kozuka³, Jana Lustikova⁵, Yoichi Nii⁶, Yoshinori Onose⁶, Yuichi Yokoyama⁷, Masaichiro Mizumaki^{7

8}, Jun-Ichi Adachi⁹, Hironori Nakao⁹, Taka-Hisa Arima⁴, Yusuke Wakabayashi¹⁰

Affiliations

¹ Department of Physics, Tohoku University, Sendai, 980-8578, Japan. [email protected].
² PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Japan. [email protected].
³ National Institute for Materials Science (NIMS), Tsukuba, 305-0047, Japan.
⁴ RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
⁵ Center for Science and Innovation in Spintronics, Tohoku University, Sendai, 980-8577, Japan.
⁶ Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.
⁷ Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Sayo, 679-5198, Japan.
⁸ Faculty of Science, Course for Physical Sciences, Kumamoto University, Kumamoto, 860-0862, Japan.
⁹ Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, 305-0801, Japan.
¹⁰ Department of Physics, Tohoku University, Sendai, 980-8578, Japan.

Abstract

Time-resolved X-ray magnetic circular dichroism under the effects of ferromagnetic resonance (FMR), known as X-ray ferromagnetic resonance (XFMR) measurements, enables direct detection of precession dynamics of magnetic moment. Here we demonstrated XFMR measurements and Bayesian analyses as a quantitative probe for the precession of spin and orbital magnetic moments under the FMR effect. Magnetization precessions in two different Pt/Ni-Fe thin film samples were directly detected. Furthermore, the ratio of dynamical spin and orbital magnetic moments was evaluated quantitatively by Bayesian analyses for XFMR energy spectra around the Ni $L_{2, 3}$ absorption edges. Our study paves the way for a microscopic investigation of the contribution of the orbital magnetic moment to magnetization dynamics.

Abstract

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