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Spin pumping through nanocrystalline topological insulators

DOI: 10.1088/1361-6528/acc663 DOI Help

Authors: David M. Burn (Diamond Light Source) , Jheng-Cyuan Lin (University of Oxford) , Ryuji Fujita (University of Oxford) , Barat Achinuq (University of Oxford) , Joshua Bibby (University of Oxford) , Angadjit Singh (University of Oxford) , Andreas Frisk (Diamond Light Source) , Gerrit Van Der Laan (Diamond Light Source) , Thorsten Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nanotechnology

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 21872 , 27487

Open Access Open Access

Abstract: The topological surface states (TSSs) in topological insulators (TIs) offer exciting prospects for dissipationless spin transport. Common spin-based devices, such as spin valves, rely on trilayer structures in which a non-magnetic (NM) layer is sandwiched between two ferromagnetic (FM) layers. The major disadvantage of using high-quality single-crystalline TI films in this context is that a single pair of spin-momentum locked channels spans across the entire film, meaning that only a very small spin current can be pumped from one FM to the other, along the side walls of the film. On the other hand, using nanocrystalline TI films, in which the grains are large enough to avoid hybridization of the TSSs, will effectively increase the number of spin channels available for spin pumping. Here, we used an element-selective, x-ray based ferromagnetic resonance technique to demonstrate spin pumping from a FM layer at resonance through the TI layer and into the FM spin sink.

Diamond Keywords: Ferromagnetism

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

Added On: 28/03/2023 21:11


Discipline Tags:

Quantum Materials Physics Components & Micro-systems Information & Communication Technologies Magnetism Materials Science Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)