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Magnetization dynamics induced by Rashba effect in ferromagnetic films


Manipulating the magnetization of ferromagnets by the current-induced spin-orbit torque shows great potential applications in the design of low energy consumption spintronic devices. Normally, an external magnetic field is needed for the current assisted magnetization reversal by the spin-orbit torque. Recently, the switching of magnetization driven by the spin-orbit torque in the absence of external magnetic field was reported in a Ta/Co20Fe60B20/TaOx system with a lateral structural asymmetry. To understand the physics behind this experiment, we perform the first-principle calculation on the potential profile at the interface between the ferromagnetic film and the wedge-shaped deposited metal oxidation in the Ta/Co/TaO system. This reveals that the lateral structural asymmetry generates two additional Rashba interactions which can reduce the minimal external field required to reverse the magnetization. In addition, we derive the Landau-Lifshitz-Gilbert equation from the quantum transport perspective and investigate numerically the magnetization dynamics in ferromagnetic films induced by Rashba interactions including those generated by lateral asymmetry. Our theoretical simulation provides microscopic explanations on experimental observations of magnetization switching in the absence of external field of the lateral structural asymmetric devices.

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Publication details

The article was received on 07 Jun 2018, accepted on 11 Sep 2018 and first published on 13 Sep 2018

Article type: Paper
DOI: 10.1039/C8NR04628J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Magnetization dynamics induced by Rashba effect in ferromagnetic films

    Z. Yu, J. Chen, L. Zhang, Y. Xing and J. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR04628J

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