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Magnon Spin Current Induced by Triplet Cooper Pair Supercurrents
Lina G Johnsen1, Haakon T Simensen1, Arne Brataas1
1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Physical Review Letters
|December 3, 2021
Summary
Researchers demonstrate converting supercurrents into magnon spin currents at ferromagnetic insulator-superconductor interfaces. This spin coupling effect utilizes triplet Cooper pairs to generate magnon spin currents in the insulator.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Superconductivity
Background:
- Interactions at interfaces between magnetic materials and superconductors are crucial for novel quantum phenomena.
- Spin-orbit coupling and exchange interactions mediate spin transfer between adjacent materials.
Purpose of the Study:
- To investigate the conversion of supercurrents into magnon spin currents.
- To explore the role of triplet Cooper pairs in spin dynamics at ferromagnetic insulator-superconductor interfaces.
Main Methods:
- Theoretical analysis of spin coupling at the interface.
- Modeling the influence of triplet Cooper pair polarization on magnon generation.
Main Results:
- A coupling between ferromagnetic insulator spins and superconductor spins is established.
- Supercurrents carried by triplet Cooper pairs induce magnon spin currents in the ferromagnetic insulator.
- The effect is strongest for Cooper pairs polarized parallel to the ferromagnetic insulator's magnetization.
Conclusions:
- Demonstrates a novel mechanism for converting charge supercurrents into spin currents.
- Highlights the potential for controlling magnetic excitations using superconducting currents.
- Offers a pathway for developing spintronic devices based on hybrid superconductor-ferromagnet systems.
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