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

Research output: Contribution to journalArticle


A. I. Figueroa, A. A. Baker, L. J. Collins-McIntyre, T. Hesjedal, G. Van Der Laan

School/Research organisations


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 solution to this drawback, giving access to element-, site-, and layer-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.



Original languageEnglish
Pages (from-to)178-183
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Early online date10 Jul 2015
Publication statusPublished - 15 Feb 2016

    Research areas

  • Spin pumping, Spintronics, Topological insulators, X-ray detected ferromagnetic resonance

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