Effective Exchange Energy in a Thin, Spatially Inhomogeneous CuNi Layer Proximized by Nb

Авторы: Stolyarov Vasily, Oboznov Vladimir, Kasatonov Daniil, Neilo Alexey, Bakurskiy Sergey, Klenov Nikolay, Soloviev Igor, Kupriyanov Mikhail, Golubov Alexander, Cren Tristan, Roditchev Dimitri
Журнал: Journal of Physical Chemistry Letters
Том: 13
Номер: 28
Год издания: 2022
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 6400
Последняя страница: 6406
DOI: 10.1021/acs.jpclett.2c00978
Аннотация: Thin films of diluted magnetic alloys are widely used in superconducting spintronics devices. Most studies rely on transport measurements and assume homogeneous magnetic layers. Here we examine on a local scale the electronic properties of the well-known two-layer superconductor/ferromagnet structure Nb/CuNi. Scanning tunneling spectroscopy experiments demonstrated significant spatial variations of the tunneling conductance on nanoscale, with characteristic gapped, nongapped, and strongly zero-bias peaked spectra. The microscopic theory successfully reproduced the observed spectra and relied them to spatial variations of CuNi film thickness and composition, leading to strong variations of the effective exchange energy. The observed inhomogeneities put constraints on the use of diluted magnetic alloys in nanoscale devices.
Добавил в систему: Куприянов Михаил Юрьевич

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