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Very recently, a dramatic increase in magnetic torque has been observed in ferrimagnetic insulators interfaced with CuOx and the results are explained in the framework of orbital-current generation and emission from CuOx. The conversion of charge-current into the orbital current is governed via the orbital Hall or orbital Rashba effect, a similar analogy to the spin Hall and Rashba effect. In this talk, we will present our latest results on the observation of damping-like torque in Co/CuOx without any heavy-metal layer due to orbital Rashba effect at Co/CuOx interface. Furthermore, we observe a two-fold increase in damping-like torques in Co(2)/Pt(4)/Cu/CuOx(3) that further validates our hypothesis.
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Sachin Krishnia, Vincent Cros, Sophie Collin, Jean-Marie George, Henri-Yves Jaffrès, "Enhancement of spin-orbit torques in ferromagnetic layer via orbital Hall effect (Conference Presentation)," Proc. SPIE PC12205, Spintronics XV, PC1220517 (4 October 2022); https://doi.org/10.1117/12.2634334