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10 September 2019 Spin-orbit coupling-driven superconducting spintronics (Conference Presentation)
Niladri Banerjee
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Proceedings Volume 11090, Spintronics XII; 110903R (2019) https://doi.org/10.1117/12.2530351
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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)
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Niladri Banerjee "Spin-orbit coupling-driven superconducting spintronics (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 110903R (10 September 2019); https://doi.org/10.1117/12.2530351
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KEYWORDS
Superconductors
Spintronics
Superconductivity
Interfaces
Heterojunctions
Modulation
Niobium
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