Chiral antiferromagnetic Josephson junctions as spin-triplet supercurrent spin valves and d.c. SQUIDsopen access
- Authors
- Jeon, K.-R.; Hazra, B.K.; Kim, J.-K.; Jeon, J.-C.; Han, H.; Meyerheim, H.L.; Kontos, T.; Cottet, A.; Parkin, S.S.P.
- Issue Date
- Jul-2023
- Publisher
- Nature Research
- Citation
- Nature Nanotechnology, v.18, no.7, pp 747 - 753
- Pages
- 7
- Journal Title
- Nature Nanotechnology
- Volume
- 18
- Number
- 7
- Start Page
- 747
- End Page
- 753
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/68299
- DOI
- 10.1038/s41565-023-01336-z
- ISSN
- 1748-3387
1748-3395
- Abstract
- Spin-triplet supercurrent spin valves are of practical importance for the realization of superconducting spintronic logic circuits. In ferromagnetic Josephson junctions, the magnetic-field-controlled non-collinearity between the spin-mixer and spin-rotator magnetizations switches the spin-polarized triplet supercurrents on and off. Here we report an antiferromagnetic equivalent of such spin-triplet supercurrent spin valves in chiral antiferromagnetic Josephson junctions as well as a direct-current superconducting quantum interference device. We employ the topological chiral antiferromagnet Mn3Ge, in which the Berry curvature of the band structure produces fictitious magnetic fields, and the non-collinear atomic-scale spin arrangement accommodates triplet Cooper pairing over long distances (>150 nm). We theoretically verify the observed supercurrent spin-valve behaviours under a small magnetic field of <2 mT for current-biased junctions and the direct-current superconducting quantum interference device functionality. Our calculations reproduce the observed hysteretic field interference of the Josephson critical current and link these to the magnetic-field-modulated antiferromagnetic texture that alters the Berry curvature. Our work employs band topology to control the pairing amplitude of spin-triplet Cooper pairs in a single chiral antiferromagnet. © 2023, The Author(s).
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Collections - College of Natural Sciences > Department of Physics > 1. Journal Articles
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