1. Determination of spin Hall angle in heavy metal/CoFeB-based heterostructures with interfacial spin-orbit fields
- Author
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Skowro��ski, Witold, Karwacki, ��ukasz, Zi��tek, S��awomir, Kanak, Jaros��aw, ��azarski, Stanis��aw, Grochot, Krzysztof, Stobiecki, Tomasz, Ku��wik, Piotr, Stobiecki, Feliks, and Barna��, J��zef
- Subjects
Condensed Matter::Materials Science ,FOS: Physical sciences ,Condensed Matter::Strongly Correlated Electrons ,Applied Physics (physics.app-ph) ,Physics - Applied Physics - Abstract
Magnetization dynamics in W/CoFeB, CoFeB/Pt and W/CoFeB/Pt multilayers was investigated using spin-orbit-torque ferromagnetic resonance (SOT-FMR) technique. An analytical model based on magnetization dynamics due to SOT was used to fit heavy metal (HM) thickness dependence of symmetric and antisymmetric components of the SOT-FMR signal. The analysis resulted in a determination of the properties of HM layers, such as spin Hall angle and spin diffusion length. The spin Hall angle of -0.36 and 0.09 has been found in the W/CoFeB and CoFeB/Pt bilayers, respectively, which add up in the case of W/CoFeB/Pt trilayer. More importantly, we have determined effective interfacial spin-orbit fields at both W/CoFeB and CoFeB/Pt interfaces, which are shown to cancel Oersted field for particular thicknesses of the heavy metal layers, leading to pure spin-current-induced dynamics and indicating the possibility for a more efficient magnetization switching., 8 pages, 4 figures, submitted to Physical Review Applied
- Published
- 2018