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Nano artificial alloys in bulk-immiscible Ru-Cu system for spin-current generation
Spin current is a flow of spin angular momentum and is considered as an ideal information carrier for spintronic devices due to the merit of low power consumption. However, an efficient conversion between charge and spin current usually depends on the strong spin-orbit interaction (SOI) in heavy 5d metals such as Pt and Ta. Here we report a remarkable enhancement in the spin transport property in a negligible SOI system of Cu50Ru50. Although Cu-Ru system is bulk-immiscible, the Cu50Ru50 film, prepared by the alternate monoatomic layer deposition method, is a nano artificial alloy and the atomic-scale intermixing has been directly confirmed by atomic-resolution energy-dispersive X-ray spectroscopy. Compared with pure Cu and Ru metals, we find 100 times enhancement in unidirectional spin Hall magnetoresistance detected in this nano artificial alloy, which is comparable to values in Pt and Ta. Our findings are expected to be applicable to other bulk-immiscible metallic systems with a weak SOI, which paves a way for designing novel alloy films with desirable properties and functionalities.
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