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Study of spin pumping through α‐Sn thin films

DOI: 10.1002/pssr.202100137 DOI Help

Authors: Łukasz Gladczuk (University of Oxford) , Leszek Gladczuk (Institute of Physics, Polish Academy of Science) , Piotr Dluzewski (Institute of Physics, Polish Academy of Science) , Gerrit Van Der Laan (Diamond Light Source) , Thorsten Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physica Status Solidi (rrl) – Rapid Research Letters , VOL 100

State: Published (Approved)
Published: May 2021
Diamond Proposal Number(s): 15211 , 16099

Open Access Open Access

Abstract: Elemental tin in the α‐phase is an intriguing member of the family of topological quantum materials. In thin films, with decreasing thickness, α‐Sn transforms from a 3D topological Dirac semimetal (TDS) to a 2D topological insulator (TI). Getting access to and making use of its topological surface states is challenging and requires interfacing to a magnetically ordered material. Herein, the successful epitaxial growth of α‐Sn thin films on Co, forming the core of a spin‐valve structure, is reported. Time‐ and element‐selective ferromagnetic resonance experiments are conducted to investigate the presence of spin pumping through the spin‐valve structure. A rigorous statistical analysis of the experimental data using a model based on the Landau–Lifshitz–Gilbert–Slonczewski equation is applied. A strong exchange coupling contribution is found, however no unambiguous proof for spin pumping. Nevertheless, the incorporation of α‐Sn into a spin valve remains a promising approach given its simplicity as an elemental TI and its room‐temperature application potential.

Journal Keywords: ferromagnetic resonance; spin pumping; topological insulators; topological quantum materials

Diamond Keywords: Spintronics; Ferromagnetism

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism

Added On: 05/05/2021 13:51


Discipline Tags:

Surfaces Quantum Materials Hard condensed matter - electronic properties Physics Electronics Magnetism Materials Science interfaces and thin films

Technical Tags:

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