Realisation of de Gennes$'$ Absolute Superconducting Switch with a Heavy Metal Interface
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914326510567424 |
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| author | Matsuki, Hisakazu Hijano, Alberto Mazur, Grzegorz P. Ilic, Stefan Wang, Binbin Alekhina, Yuliya Ohnishi, Kohei Komori, Sachio Li, Yang Stelmashenko, Nadia Banerjee, Niladri Cohen, Lesley F. McComb, David W. Bergeret, F. Sebastian Yang, Guang Robinson, Jason W. A. |
| author_facet | Matsuki, Hisakazu Hijano, Alberto Mazur, Grzegorz P. Ilic, Stefan Wang, Binbin Alekhina, Yuliya Ohnishi, Kohei Komori, Sachio Li, Yang Stelmashenko, Nadia Banerjee, Niladri Cohen, Lesley F. McComb, David W. Bergeret, F. Sebastian Yang, Guang Robinson, Jason W. A. |
| contents | In 1966, Pierre-Gilles de Gennes proposed a non-volatile mechanism for switching superconductivity on and off in a magnetic device. This involved a superconductor (S) sandwiched between ferromagnetic (F) insulators in which the net magnetic exchange field could be controlled through the magnetisation-orientation of the F layers. Because superconducting switches are attractive for a range of applications, extensive studies have been carried out on $F/S/F$ structures. Although these have demonstrated a sensitivity of the superconducting critical temperature ($T_{c}$) to parallel (P) and antiparallel (AP) magnetisation-orientations of the F layers, corresponding shifts in $T_c$ (i.e., $ΔT_c = T_{c,AP} - T_{c,P}$) are lower than predicted with $ΔT_c$ only a small fraction of $T_{c,AP}$, precluding the development of applications. Here, we report $EuS/Au/Nb/EuS$ structures where EuS is an insulating ferromagnet, Nb is a superconductor and Au is a heavy metal. For P magnetisations, the superconducting state in this structure is quenched down to the lowest measured temperature of 20 mK meaning that $ΔT_c/T_{c,AP}$ is practically 1. The key to this so-called absolute switching effect is a sizable spin-mixing conductance at the $EuS/Au$ interface which ensures a robust magnetic proximity effect, unlocking the potential of $F/S/F$ switches for low power electronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_16264 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Realisation of de Gennes$'$ Absolute Superconducting Switch with a Heavy Metal Interface Matsuki, Hisakazu Hijano, Alberto Mazur, Grzegorz P. Ilic, Stefan Wang, Binbin Alekhina, Yuliya Ohnishi, Kohei Komori, Sachio Li, Yang Stelmashenko, Nadia Banerjee, Niladri Cohen, Lesley F. McComb, David W. Bergeret, F. Sebastian Yang, Guang Robinson, Jason W. A. Superconductivity Materials Science In 1966, Pierre-Gilles de Gennes proposed a non-volatile mechanism for switching superconductivity on and off in a magnetic device. This involved a superconductor (S) sandwiched between ferromagnetic (F) insulators in which the net magnetic exchange field could be controlled through the magnetisation-orientation of the F layers. Because superconducting switches are attractive for a range of applications, extensive studies have been carried out on $F/S/F$ structures. Although these have demonstrated a sensitivity of the superconducting critical temperature ($T_{c}$) to parallel (P) and antiparallel (AP) magnetisation-orientations of the F layers, corresponding shifts in $T_c$ (i.e., $ΔT_c = T_{c,AP} - T_{c,P}$) are lower than predicted with $ΔT_c$ only a small fraction of $T_{c,AP}$, precluding the development of applications. Here, we report $EuS/Au/Nb/EuS$ structures where EuS is an insulating ferromagnet, Nb is a superconductor and Au is a heavy metal. For P magnetisations, the superconducting state in this structure is quenched down to the lowest measured temperature of 20 mK meaning that $ΔT_c/T_{c,AP}$ is practically 1. The key to this so-called absolute switching effect is a sizable spin-mixing conductance at the $EuS/Au$ interface which ensures a robust magnetic proximity effect, unlocking the potential of $F/S/F$ switches for low power electronics. |
| title | Realisation of de Gennes$'$ Absolute Superconducting Switch with a Heavy Metal Interface |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2404.16264 |