TY - JOUR
T1 - Highly accurate evaluation of spin-torque efficiency by measuring in-plane angular dependence of spin-torque ferromagnetic resonance
AU - Horaguchi, Taisuke
AU - Matsuo, Mamoru
AU - Nozaki, Yukio
N1 - Funding Information:
This work was partly supported by JSPS KAKENHI Grant in Aid for JSPS Fellows ( 19J21785 ), Spintronics Research Network of Japan (Spin RNJ), Grants in Aid for Scientific Research ( 18H03867 ), and JST CREST ( JPMJCR19J4 ).
Publisher Copyright:
© 2020
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (ξFMR), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials. In general, ξFMR can be evaluated from the amplitude ratio between symmetric and anti-symmetric components of the ST-FMR spectrum. However, the ratio is also affected by an unnecessary magnetic field owing to the asymmetric alternating current flow used to excite the ST-FMR. In this article, we demonstrate that ξFMR can be precisely evaluated from the full-angular dependence of the ST-FMR spectrum even though the distribution of alternating current flow is highly asymmetric.
AB - Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (ξFMR), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials. In general, ξFMR can be evaluated from the amplitude ratio between symmetric and anti-symmetric components of the ST-FMR spectrum. However, the ratio is also affected by an unnecessary magnetic field owing to the asymmetric alternating current flow used to excite the ST-FMR. In this article, we demonstrate that ξFMR can be precisely evaluated from the full-angular dependence of the ST-FMR spectrum even though the distribution of alternating current flow is highly asymmetric.
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U2 - 10.1016/j.jmmm.2020.166727
DO - 10.1016/j.jmmm.2020.166727
M3 - Article
AN - SCOPUS:85081714906
VL - 505
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
M1 - 166727
ER -