期刊
JOURNAL OF APPLIED PHYSICS
卷 121, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4985119
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资金
- Singapore National Research Foundation, Prime Minister's Office, under its Competitive Research Programme [NRF-CRP10-2012-03]
- Ministry of Education, Singapore, under its Tier 2 Grant [MOE2013-T2-2-096]
Recently, we have demonstrated the presence of spin-orbit torque in FeMn/Pt multilayers which, in combination with the anisotropy field, is able to rotate its magnetization consecutively from 0 degrees to 360 degrees without any external field. Here, we report on an investigation of the static and dynamic magnetic properties of FeMn/Pt multilayers using the combined techniques of magnetometry, ferromagnetic resonance, inverse spin Hall effect, and spin Hall magnetoresistance measurements. The FeMn/Pt multilayer was found to exhibit ferromagnetic properties, and its temperature dependence of saturation magnetization can be fitted well using a phenomenological model by including a finite distribution in Curie temperature due to subtle thickness variations across the multilayer samples. The non-uniformity in static magnetic properties is also manifested in the ferromagnetic resonance spectra, which typically exhibit a broad resonance peak. A damping parameter of around 0.106 is derived from the frequency dependence of ferromagnetic resonance linewidth, which is comparable to the reported values for other types of Pt-based multilayers. Clear inverse spin Hall signals and spin Hall magnetoresistance have been observed in all samples below the Curie temperature, which corroborate the strong spin-orbit torque effect observed previously. Published by AIP Publishing.
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