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MMM 2022

November 07, 2022

Minneapolis, United States

Large spin current generation from the Rashba surface at Ti/Pt interface

We report a large spin-current generation from the interface of the Ti/Pt bilayer. By doing the spin-torque ferromagnetic resonance (ST-FMR)1 in Ti(5)/Pt(1.5)/Py(5)/Pt(1.5) heterostructure, we observe a large enhancement of the damping-like torque that cannot be explained by the spin Hall effect (SHE) of Pt due to the cancellation of the spin-current generated from the symmetrically placed Pt layers on either side of the ferromagnet. We observe that the sign of damping-like torque generated in Ti/Pt/Py/Ti heterostructure is opposite as compared to Pt/Py bilayers which rule out the possibility of the conversion of orbital-current generated by Ti into the spin-current using the spin-orbit coupling of Pt2–5. This effect is reproduced for different thicknesses of Py (4 -8 nm). We confirm that this effect disappears when Pt is substituted by Cu. All these pieces of evidence together suggest a possible formation of the Rashba surface at the Ti/Pt interface due to their work function difference (approximately 1.3 eV). This could be a way to boost up the generated spin-current by exploiting the interfacial Rashba-Edelstein effect and bulk spin hall effect together for practical applications.

1 L. Liu, T. Moriyama, D.C. Ralph, and R.A. Buhrman, Phys. Rev. Lett. 106, 1 (2011). 2 D. Go, F. Freimuth, J.P. Hanke, F. Xue, O. Gomonay, K.J. Lee, S. Blügel, P.M. Haney, H.W. Lee, and Y. Mokrousov, Phys. Rev. Res. 2, 1 (2020). 3 Y. Choi, D. Jo, K. Ko, D. Go, and H. Lee, ArXiv:2109.14847v1 1 (2021). 4 S. Lee, M.G. Kang, D. Go, D. Kim, J.H. Kang, T. Lee, G.H. Lee, J. Kang, N.J. Lee, Y. Mokrousov, S. Kim, K.J. Kim, K.J. Lee, and B.G. Park, Commun. Phys. 4, 3 (2021). 5 S. Ding, A. Ross, D. Go, L. Baldrati, Z. Ren, F. Freimuth, S. Becker, F. Kammerbauer, J. Yang, G. Jakob, Y. Mokrousov, and M. Kläui, Phys. Rev. Lett. 125, (2020).

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Study of Spin Orbit Torque in PtSe2/NiFe/Pt Heterostructure

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MMM 2022

+4Himanshu Bangar
Richa Mudgal and 6 other authors

07 November 2022

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