Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures

Mueller M, Liensberger L, Flacke L, Huebl H, Kamra A, Belzig W, Gross R, Weiler M, Althammer M (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Physical Review Letters American Physical Society

Book Volume: 126

Article Number: 087201

Journal Issue: 8

DOI: 10.1103/PhysRevLett.126.087201

Abstract

We investigate the injection of quasiparticle spin currents into a superconductor via spin pumping from an adjacent ferromagnetic metal layer. To this end, we use NbN-Ni80Fe20(Py) heterostructures with a Pt spin sink layer and excite ferromagnetic resonance in the Permalloy layer by placing the samples onto a coplanar waveguide. A phase sensitive detection of the microwave transmission signal is used to quantitatively extract the inductive coupling strength between the sample and the coplanar waveguide, interpreted in terms of inverse current-induced torques, in our heterostructures as a function of temperature. Below the superconducting transition temperature Tc, we observe a suppression of the dampinglike torque generated in the Pt layer by the inverse spin Hall effect, which can be understood by the changes in spin current transport in the superconducting NbN layer. Moreover, below Tc we find a large fieldlike current-induced torque.

Involved external institutions

Bayerische Akademie der Wissenschaften DE Germany (DE) NTNU Trondheim - Norwegian University of Science and Technology NO Norway (NO) Universität Konstanz DE Germany (DE)

How to cite

APA:

Mueller, M., Liensberger, L., Flacke, L., Huebl, H., Kamra, A., Belzig, W.,... Althammer, M. (2021). Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures. Physical Review Letters, 126(8). https://doi.org/10.1103/PhysRevLett.126.087201

MLA:

Mueller, M., et al. "Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures." Physical Review Letters 126.8 (2021).

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