Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 505, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2020.166727
Keywords
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Funding
- JSPS KAKENHI [19J21785]
- Spintronics Research Network of Japan (Spin RNJ) [18H03867]
- JST CREST [JPMJCR19J4]
- Grants-in-Aid for Scientific Research [19J21785, 18H03867] Funding Source: KAKEN
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Spin-torque ferromagnetic resonance (ST-FMR) is a powerful tool to evaluate spin-torque efficiency (xi(FMR)), the efficiency of current-induced torque in metallic bilayers consisting of ferromagnetic and nonmagnetic materials. In general, xi(FMR) 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 xi(FMR) 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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