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4 October 2024 Orbital currents and torques on transition metals using interfacial orbital Rashba effect
Benjamin Bony, Nicolas Sebe, S. Krishnia, E. Rongione, L. Moreno Vincente-Arche, T. Denneulin, Y. Lu, R. E. Dunin-Borkowski, S. Collin, A. Fert, J.-M. George, N. Reyren, J.-B. Moussy, J.-Y. Chauleau, M. Viret, V. Cros, H. Jaffrès
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Proceedings Volume PC13119, Spintronics XVII; PC131191L (2024) https://doi.org/10.1117/12.3028605
Event: Nanoscience + Engineering, 2024, San Diego, California, United States
Abstract
Recent works provide evidence for a large orbital Rashba-Edelstein effect at the interface between Cu and its oxide. Here, we experimentally demonstrate that a very large enhancement of both the net torque and the spin-pumping voltage (up to a factor of two) can be obtained with the insertion of a Pt layer whose large spin-orbit coupling helps to convert a pure orbital current into a spin current. These two reciprocal phenomena, observed simultaneously for the first time in the same Co/Pt/Cu/CuOx samples, are in agreement and their orbital angular momentum nature associated to a charge-to-orbit (orbit-to-charge) conversion at the Cu/CuOx interface constitutes a robust interpretation. To disentangle spin and orbital currents in these systems, we also measure the ferromagnet thickness dependence of the net torques and observe a clear increase of the corresponding dephasing length, indicating the contribution of pure orbital currents acting on the magnetization. From the Cu thickness dependence, we also verify that the conversion occurs at the Cu/CuOx interface through the orbital Rashba effect as observed in both torque and spin-pumping measurements.
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Benjamin Bony, Nicolas Sebe, S. Krishnia, E. Rongione, L. Moreno Vincente-Arche, T. Denneulin, Y. Lu, R. E. Dunin-Borkowski, S. Collin, A. Fert, J.-M. George, N. Reyren, J.-B. Moussy, J.-Y. Chauleau, M. Viret, V. Cros, and H. Jaffrès "Orbital currents and torques on transition metals using interfacial orbital Rashba effect", Proc. SPIE PC13119, Spintronics XVII, PC131191L (4 October 2024); https://doi.org/10.1117/12.3028605
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KEYWORDS
Copper
Transition metals
Platinum
Interfaces
Data conversion
Resonance enhancement
X-ray photoelectron spectroscopy
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