Journal
AIP ADVANCES
Volume 8, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5023192
Keywords
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Funding
- State Key Project of Research and Development of China [2017YFA0206302]
- National Nature Science Foundation of China [51590883, 51331006, 51771198]
- Chinese Academy of Sciences [KJZD-EW-M05-3]
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Spin-orbit torques (SOTs) and the perpendicular magnetic anisotropy (PMA) in Ta/W/CoFeB/MgO structures have been investigated by varying the thickness of the W layer. Addition of the W layer gives rise to enhancement of the annealing stability and perpendicular anisotropy field. After annealing at high temperature, a high-resistivity is obtained for samples with W layer (up to 2 nm thickness), which indicates the existence of beta-W phase. A giant spin Hall angle of 0.50 is found in Ta/W/CoFeB/MgO structures with a 2 nm W layer by using the harmonic Hall voltage measurement. The lowest switching current density of 6 MA/cm(2) is achieved in the sample with 1 nm W layer, indicating that a strong interfacial spin Hall effect may exist in the CoFeB/W interface. The study may provide a way to obtain simultaneously a large PMA as well as a high efficiency of SOTs. (C) 2018 Author(s).
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