Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.46: Poster

Thursday, April 4, 2019, 15:00–18:00, Poster C

Superconductor/Ferromagnet-Heterostructures for superconducting spintronics — •Manuel Müller^1,2, Mathias Weiler^1,2, Hans Huebl^1,2,3, Rudolf Gross^1,2,3, and Matthias Althammer^1,2 — ¹Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Physik-Department, Technische Universität München, Germany — ³Nanosystems Initiative Munich, München, Germany

The interplay and competition of superconducting and ferromagnetic ordering phenomena in thin film structures has attracted considerable attention over the last decade. In particular, the control of spin current transport properties in superconductors offer promising new possibilities in the field of spintronics. We here investigate the injection of quasiparticle spin currents into superconductors by spin pumping from an adjacent ferromagnetic layer. To this end, NbN/Co₂₅Fe₇₅ heterostructures are grown by reactive DC-sputtering under ultra-high vacuum conditions. For the broadband spin pumping experiments we excite the ferromagnetic resonance in the Co₂₅Fe₇₅ layer by placing the samples onto a coplanar waveguide. We study the spin pumping induced magnetization damping as function of temperature, especially in vicinity of the NbN superconducting transition temperature. A phase sensitive detection of the microwave transmission signal cite is used to quantitatively extract the inductive coupling strength and spin current transport in our heterostructures. We find that the inductive coupling strength is strongly influenced by the superconducting transition. In addition, we compare our results to theoretical models.