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Spin-valve effect for spin-polarized surface states in topological semimetals
- Authors: Avakyants A.A.1, Esin V.D.1, Kazmin D.Y.1, Orlova N.N.1, Timonina A.V.1, Kolesnikov N.N.1, Deviatov E.V.1
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Affiliations:
- Institute of Solid State Physics of the Russian Academy of Sciences
- Issue: Vol 121, No 9-10 (2025)
- Pages: 768-770
- Section: Articles
- URL: https://journal-vniispk.ru/0370-274X/article/view/293708
- DOI: https://doi.org/10.31857/S0370274X25050099
- EDN: https://elibrary.ru/FICPTT
- ID: 293708
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Abstract
We experimentally investigate magnetoresistance of a single GeTe–Ni junction between the α-GeTe topological semimetal and thick nickel film at room and liquid helium temperatures. For the magnetic field parallel to the junction plane, we demonstrate characteristic spin-valve hysteresis with mirrored differential resistance dV/dI peaks even at room temperature. In contrast, for normal magnetic fields spin-valve effect appears only at low temperatures. From the magnetic field anisotropy, observation of the similar effect for another topological semimetal Cd3As2, and strictly flat dV/dI(H) magnetoresistance curves for the reference GeTe-Au junction, we connect the observed spin-valve effect with the spin-dependent scattering between the spin textures in the topological surface states and the ferromagnetic nickel electrode. For the topological semimetal α-GeTe, room-temperature spin-valve effect allows efficient spin-to-charge conversion even at ambient conditions.
About the authors
A. A. Avakyants
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
V. D. Esin
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
D. Yu. Kazmin
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
N. N. Orlova
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
A. V. Timonina
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
N. N. Kolesnikov
Institute of Solid State Physics of the Russian Academy of Sciences
Author for correspondence.
Email: dev@issp.ac.ru
Chernogolovka, Russia
E. V. Deviatov
Institute of Solid State Physics of the Russian Academy of Sciences
Email: dev@issp.ac.ru
Chernogolovka, Russia
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