Electrical control of superconducting spin valves using ferromagnetic helices

The geometrical properties of a helical ferromagnet are shown theoretically to control the critical temperature of a proximity-coupled superconductor. Using the Usadel equation for diffusive spin transport, we provide self-consistent analysis of how curvature and torsion modulate the proximity effec...

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Bibliographic Details
Published in:Applied physics letters 2024-08, Vol.125 (6)
Main Authors: Salamone, Tancredi, Hugdal, Henning G., Amundsen, Morten, Jacobsen, Sol H.
Format: Article
Language:English
Subjects:
Critical temperature
Ferromagnetism
Helices
Piezoelectric actuators
Pitch (inclination)
Spin valves
Superconductivity
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Summary:The geometrical properties of a helical ferromagnet are shown theoretically to control the critical temperature of a proximity-coupled superconductor. Using the Usadel equation for diffusive spin transport, we provide self-consistent analysis of how curvature and torsion modulate the proximity effect. When the helix is attached to a piezoelectric actuator, the pitch of the helix—and hence the superconducting transition—can be controlled electrically.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0210691