Spin pumping in ferromagnet-topological insulator-ferromagnet heterostructures.
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Topological insulators (TIs) are enticing prospects for the future of spintronics due to their large spin-orbit coupling and dissipationless, counter-propagating conduction channels in the surface state. However, a means to interact with and exploit the topological surface state remains elusive. Here, we report a study of spin pumping at the TI-ferromagnet interface, investigating spin transfer dynamics in a spin-valve like structure using element specific time-resolved x-ray magnetic circular dichroism, and ferromagnetic resonance. Gilbert damping increases approximately linearly with increasing TI thickness, indicating efficient behaviour as a spin sink. However, layer-resolved measurements suggest that a dynamic coupling is limited. These results shed new light on the spin dynamics of this novel material class, and suggest great potential for TIs in spintronic devices, through their novel magnetodynamics that persist even up to room temperature.
Baker , A A , Figueroa , A I , Collins-Mcintyre , L J , Van Der Laan , G & Hesjedal , T 2015 , ' Spin pumping in ferromagnet-topological insulator-ferromagnet heterostructures. ' Scientific Reports , vol 5 , 7907 . DOI: 10.1038/srep07907
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This publication arises from research funded by the John Fell Oxford University Press Research Fund. A.A.B. acknowledges funding from Diamond Light Source through a joint studentship and Wadham College through a senior scholarship. A.A.B. and L.C.M. acknowledge support from the EPSRC through doctoral training awards.
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