SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.1: Poster
Montag, 27. September 2021, 13:30–16:00, P
Proximity effects of superconducting Nb thin films on chiral magnetic substrates — •Julius Grefe1, Rodrigo de Vasconcellos Lourenço2, Philip Schröder1, Jannis Willwater1, Mauricio de Melo3, Jochen Litterst1, Stefan Süllow1, and Dirk Menzel1 — 1Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 2Institut für Angewandte Physik, TU Braunschweig, Germany — 3Departamento de Física, Universidade Estadual de Maringá, Brazil
Superconducting spin valves consisting only of a single magnetic layer and a thin superconducting film promise simple and compact devices in comparison to established GMR systems. Theory has suggested that the critical temperature TC of a superconductor can be controlled via the proximity effect with a magnetic system exhibiting a non-collinear spin structure [1]. MnSi being a member of the non-centrosymmetric B20 structure shows helimagnetic spin order below TN = 29.5 K and BC1 = 100 mT. In the related system Fe1−xCoxSi the Néel-temperature can be tuned in a range of 0 K - 55 K by variation of the Co concentration. Superconducting Nb thin films have been deposited by molecular beam epitaxy on oriented monocrystalline substrates grown by the Triarc-Czochralski method. The surface quality of the substrates and the Nb films has been investigated by atomic force microscopy resulting in a surface roughness of approximately 2 nm.
[1] N. G. Pugach et al., Appl. Phys. Lett. 111, 162601 (2017)