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

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2021

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Müller, Manuel
Liensberger, Lukas
Flacke, Luis
Huebl, Hans
Gross, Rudolf
Weiler, Mathias
Althammer, Matthias

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https://doi.org/10.1103/PhysRevLett.126.087201
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http://arxiv.org/abs/2007.15569

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Physical Review Letters. American Physical Society (APS). 2021, 126(8), 087201. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.087201

Zusammenfassung

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.

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ISO 690MÜLLER, Manuel, Lukas LIENSBERGER, Luis FLACKE, Hans HUEBL, Akashdeep KAMRA, Wolfgang BELZIG, Rudolf GROSS, Mathias WEILER, Matthias ALTHAMMER, 2021. Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures. In: Physical Review Letters. American Physical Society (APS). 2021, 126(8), 087201. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.126.087201
BibTex
@article{Muller2021Tempe-53132,
  year={2021},
  doi={10.1103/PhysRevLett.126.087201},
  title={Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures},
  number={8},
  volume={126},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Müller, Manuel and Liensberger, Lukas and Flacke, Luis and Huebl, Hans and Kamra, Akashdeep and Belzig, Wolfgang and Gross, Rudolf and Weiler, Mathias and Althammer, Matthias},
  note={Article Number: 087201}
}
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