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Journal Article

Effect of interfacial insertion layers on the spin-orbit torque in W(O)|CoFeB heterostructures

MPS-Authors

Garg,  Chirag
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Parkin,  Stuart S. P.       
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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Citation

Zhang, J., Phung, T., Hughes, B. P., Yang, S.-H., Garg, C., Jiang, Y., et al. (2019). Effect of interfacial insertion layers on the spin-orbit torque in W(O)|CoFeB heterostructures. Applied Physics Express, 12(3): 033001. doi:10.7567/1882-0786/aaf7f9.


Cite as: https://hdl.handle.net/21.11116/0000-0009-0CD6-9
Abstract
We report on an experimental investigation of spin-orbit torque (SOT) in W(O)∣CoFeB heterostructures where a thin insertion layer with negligible spin-orbit coupling is inserted at the W(O)∣CoFeB interface. The SOT is found to be suppressed with the addition of the insertion layer, contrary to estimates using the transparency formalism. In addition, the SOT, as quantified by the spin Hall angle remains constant at −50% for W(O) thicknesses down to 2 nm. Our data is thus consistent with an interfacial SOT mechanism in the W(O)∣CoFeB system.