Ishii Yuta, Yamasaki Yuichi, Kozuka Yusuke, Lustikova Jana, Nii Yoichi, Onose Yoshinori, Yokoyama Yuichi, Mizumaki Masaichiro, Adachi Jun-Ichi, Nakao Hironori, Arima Taka-Hisa, Wakabayashi Yusuke
Department of Physics, Tohoku University, Sendai, 980-8578, Japan.
PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Japan.
Sci Rep. 2024 Jul 5;14(1):15504. doi: 10.1038/s41598-024-66139-1.
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 absorption edges. Our study paves the way for a microscopic investigation of the contribution of the orbital magnetic moment to magnetization dynamics.
在铁磁共振（FMR）效应下的时间分辨X射线磁圆二色性，即所谓的X射线铁磁共振（XFMR）测量，能够直接检测磁矩的进动动力学。在此，我们展示了XFMR测量和贝叶斯分析，作为FMR效应下自旋和轨道磁矩进动的定量探针。直接检测了两个不同的Pt/Ni-Fe薄膜样品中的磁化进动。此外，通过对Ni吸收边附近的XFMR能谱进行贝叶斯分析，定量评估了动态自旋和轨道磁矩的比率。我们的研究为从微观角度研究轨道磁矩对磁化动力学的贡献铺平了道路。
