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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Temperature-Dependent Spin Transport and Current-Induced Torques in Superconductor-Ferromagnet Heterostructures.
M Müller1,2, L Liensberger1,2, L Flacke1,2
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
Physical Review Letters
|March 12, 2021
Summary
We studied spin current injection into superconductors using ferromagnetic heterostructures. Below the critical temperature, we observed suppressed dampinglike torques and a large fieldlike torque in the superconductor.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Superconducting spintronics aims to control superconductivity with spin currents.
- Spin pumping from ferromagnets is a key mechanism for generating spin currents.
Purpose of the Study:
- Investigate the injection of quasiparticle spin currents into a superconductor (NbN) from a ferromagnetic layer (Py).
- Quantify the effects of superconductivity on spin-to-charge conversion mechanisms like the inverse spin Hall effect.
Main Methods:
- Fabrication of NbN-Py heterostructures with a Pt spin sink layer.
- Excitation of ferromagnetic resonance using a coplanar waveguide.
- Phase-sensitive detection of microwave transmission to extract torque strengths.
Main Results:
- Observed a suppression of dampinglike torque below the superconducting transition temperature (Tc).
- Attributed the suppression to altered spin current transport in the superconducting NbN.
- Detected a significant fieldlike current-induced torque below Tc.
Conclusions:
- Superconductivity in NbN modulates spin current transport and associated torques.
- The findings provide insights into controlling superconducting properties via spin currents.
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