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Proceedings Paper

Spin-orbit coupling-driven superconducting spintronics (Conference Presentation)
Author(s): Niladri Banerjee

Paper Abstract

The fundamental antagonism between superconductivity and ferromagnetism arises from the nature of electron pairing in these materials - parallel for ferromagnetism and antiparallel (singlet) for superconductivity. However, recent theoretical and experimental evidences [1] suggest a unique form of odd-frequency equal-spin (triplet) superconductivity that arises at carefully engineered interfaces between ferromagnets and superconductors. These equal-spin Cooper pairs are immune to the pair breaking exchange field in a ferromagnet and can propagate over length scales which are significantly longer than the singlet pair coherence lengths. These dissipationless triplet currents carry a net spin which raises the intriguing possibility of ultra-low-dissipation superconducting spin-electronics (superspintronics). In this talk, following a brief introduction [2,3], I will specifically focus on our recent experiments demonstrating the control of triplet Cooper pairs using a single homogeneous ferromagnet coupled to a singlet superconductor Nb through a spin-orbit coupled interface. Our results demonstrate the crucial role played by spin-orbit coupling in modulating the triplets in a superconductor/ferromagnet system. I will also briefly focus on our recent theoretical prediction of magnetization reorientation triggered purely by a superconducting transition in ferromagnet/superconductor heterostructures with spin-orbit coupling. 1. J. Linder and J. W. A. Robinson, Nature Physics 11, 307–315 (2015) 2. N. Banerjee et al., Nature Communications 5:4771 (2014) 3. N. Banerjee et al., Nature Communications 5:3048 (2014) 4. N. Banerjee et al., Phys. Rev. B 97, 184521 (2018) 5. Lina G Johnsen et al., arXiv:1901.00501v2 (2019)

Paper Details

Date Published: 10 September 2019
Proc. SPIE 11090, Spintronics XII, 110903R (10 September 2019); doi: 10.1117/12.2530351
Show Author Affiliations
Niladri Banerjee, Loughborough Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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