Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 18: Skyrmions (joint session TT/MA)

TT 18.5: Vortrag

Montag, 16. März 2020, 17:15–17:30, HSZ 304

Tuning of the critical temperature of a superconducting thin film in proximity of a chiral magnet — •Julius Grefe, Marvin Sach, Bastian Rubrecht, Jannis Willwater, Stefan Süllow, and Dirk Menzel — Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany

Theory has suggested a possibility to control the critical temperature TC of a superconductor via the proximity effect with a magnetic system exhibiting a non-collinear spin structure [1]. MnSi being an archetype of the B20 structure shows helimagnetic behavior below TN = 29.5 K and BC1 = 100 mT. The related pseudobinary compound Fe1−xCoxSi with a tunable Néel-temperature from 0 K to 55 K even expands the accessible temperature range.

Superconducting Nb thin films have been deposited by molecular beam epitaxy on substrates prepared from Triarc-Czochralski grown single crystals. We investigate a shift of TC in the Nb film upon reorientation of the spin helices in the substrate.

This proximity effect is suggested for usage in superconducting spin valves consisting only of a single magnetic layer and a thin superconducting film promising more simple and compact devices.

[1] N. G. Pugach et al., Appl. Phys. Lett. 111, 162601 (2017).

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