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Anomalous magneto-resistance of Ni-nanowire/Nb hybrid system

Article scientifique 2019 Anglais

Résumé

We examine the influence of superconductivity on the magneto-transport properties of a ferromagnetic Ni nanowire connected to Nb electrodes. We show experimentally and confirm theoretically that the Nb/Ni interface plays an essential role in the electron transport through the device. Just below the superconducting transition, a strong inverse proximity effect from the nanowire suppresses superconducting correlations at Nb/Ni interfaces, resulting in a conventional anisotropic magneto-resistive response. At lower temperatures however, the Nb electrodes operate as superconducting shunts. As the result, the magneto-resistance exhibits a strongly growing hysteretic behavior accompanied by a series of saw-like jumps. The latter are associated with the penetration/escape of individual Abrikosov vortices that influence non-equilibrium processes at the Nb/Ni interface. These effects should be taken into account when designing superconducting quantum nano-hybrids involving ferromagnetic nanowires.

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Skryabina, O., Козлов, С., Егоров, С., Klimenko, A., Ryazanov, V., Bakurskiy, S., Kupriyanov, M., Klenov, N., Soloviev, I., Golubov, A., Napolskii, K., Golovchanskiy, I., Roditchev, D., Stolyarov, V. (2019). Anomalous magneto-resistance of Ni-nanowire/Nb hybrid system. https://doi.org/10.1038/s41598-019-50966-8

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Auteur(s)

Olga V. Skryabina С. Н. Козлов С. В. Егоров Alexey A. Klimenko V. V. Ryazanov S. V. Bakurskiy M. Yu. Kupriyanov N. V. Klenov I. I. Soloviev A. A. Golubov Kirill S. Napolskii I. A. Golovchanskiy Dimitri Roditchev V. S. Stolyarov

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