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Composite Topological Excitations in Ferromagnet-Superconductor Heterostructures
Kjetil M D Hals1,2, Michael Schecter2, Mark S Rudner1,2
1Niels Bohr International Academy, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.
Physical Review Letters
|July 16, 2016
Summary
Researchers explored the creation of Skyrmion-vortex pairs (SVPs) in hybrid ferromagnetic-superconducting systems. They found these topological excitations can be attractive or repulsive and controlled by spin currents.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Topological excitations like Skyrmions and vortices are crucial in condensed matter physics.
- Hybrid systems combining ferromagnetic and superconducting materials offer unique phenomena due to interfacial effects.
Purpose of the Study:
- Investigate the formation of novel composite topological excitations: Skyrmion-vortex pairs (SVPs).
- Explore the magnetoelectric coupling mediated by spin-orbit interaction in hybrid ferromagnetic-superconducting systems.
- Determine conditions for SVP formation and characterize their binding potential.
Main Methods:
- Analytical estimations to derive effective binding potentials.
- Numerical simulations to validate theoretical predictions and explore dynamics.
- Semiclassical modeling to describe coupled Skyrmion-vortex dynamics.
Main Results:
- Identified a magnetoelectric coupling between Skyrmions and vortices mediated by spin-orbit interaction.
- Determined conditions for the formation of bound Skyrmion-vortex pairs (SVPs).
- Characterized the attractive or repulsive nature and strength of the SVP binding potential.
Conclusions:
- Skyrmion-vortex pairs are a new class of composite topological excitations in hybrid systems.
- The interaction sign and strength depend on topological indices and material properties.
- SVPs can be dynamically controlled using applied spin currents, opening avenues for spintronic applications.
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