Energy-Efficient Domain-Wall Motion Governed by the Interplay of Helicity-Dependent Optical Effect and Spin-Orbit Torque

Abstract : Spin-orbit torque provides a powerful means of manipulating domain walls along magnetic wires. However , the current density required for domain-wall motion is still too high to realize low power devices. We experimentally demonstrate helicity-dependent domain-wall motion by combining synchronized fem-tosecond laser pulses and short current pulses in Co/Ni/Co ultrathin-film wires with perpendicular magnetization. The domain wall can remain pinned under one laser circular helicity while being depinned by the opposite circular helicity. Thanks to the all-optical helicity-dependent effect, the threshold current density due to spin-orbit torque can be reduced by more than 50%. Based on this joint effect combining spin-orbit torque and helicity-dependent laser pulses, an optoelectronic logic-in-memory device is experimentally demonstrated. This work enables an alternative class of low-power spintronic-photonic devices beyond the conventional approach of all-optical switching or all-current switching for data storage.
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Boyu Zhang, Yong Xu, Weisheng Zhao, Daoqian Zhu, Xiaoyang Lin, et al.. Energy-Efficient Domain-Wall Motion Governed by the Interplay of Helicity-Dependent Optical Effect and Spin-Orbit Torque. Physical Review Applied, American Physical Society, 2019, 11 (3), pp.034001. ⟨10.1103/PhysRevApplied.11.034001⟩. ⟨hal-02065308⟩

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