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Spin pumping through a topological insulator probed by x-ray detected ferromagnetic resonance

DOI: 10.1016/j.jmmm.2015.07.013 DOI Help

Authors: Adriana Figueroa (Diamond Light Source) , A. A. Baker (Diamond Light Source) , L Collins-mcintyre (University of Oxford) , T. Hesjedal (Diamond Light Source) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Magnetism And Magnetic Materials

State: Published (Approved)
Published: July 2015
Diamond Proposal Number(s): 9210 , 11500

Abstract: In the field of spintronics ,the generation of a pure spin current (without macroscopic charge flow) through spin pumping of a ferromagnetic(FM) layer opens up the perspective of a new generation of dissipation-less devices. Microwave driven ferromagnetic resonance (FMR) can generate a pure spin current that enters adjacent layers, allowing for both magnetization reversal (through spin-transfer torque) and to probe spin coherence in non-magnetic materials. However, standard FMR is unable to probe multilayer dynamics directly, since the measurement averages over the contributions from the whole system. The synchrotron radiation-based technique of x-ray detected FMR (XFMR) offers an elegant solutiontothisdrawback,givingaccesstoelement-,site-,andlayer-specific dynamical measurements in heterostructures. In this work, we show how XFMR has provided unique information to understand spin pumping and spin transfer torque effects through a topological insulator (TI) layer in a pseudo-spin valve heterostructure. We demonstrate that TIs function as efficient spin sinks, while also allowing a limited dynamic coupling between ferromagnetic layers. These results shed new light on the spin dynamics of this novel class of materials, and suggest future directions for the development of room temperature TI-based spintronics.

Journal Keywords: Spintronics; Topological Insulators; Ferromagnetic Resonance

Subject Areas: Physics, Materials


Instruments: I10-Beamline for Advanced Dichroism

Other Facilities: ALS Berkeley