Dynamically Reentrant Skyrmion Phase in Oscillating Magnetic Fields

Area of Science:

• Condensed matter physics
• Topological matter
• Magnetism

Background:

• Driven topological matter is a key area of research.
• Understanding nonequilibrium responses is crucial for controlling quantum materials.
• Dzyaloshinskii-Moriya interactions play a role in magnetic structures.

Purpose of the Study:

• Investigate the nonequilibrium response of a 2D magnet with Dzyaloshinskii-Moriya interactions.
• Explore the effects of a periodically oscillating magnetic field on magnetic phases.
• Uncover novel dynamic phases and their properties.

Main Methods:

• Utilized extensive Monte Carlo simulations.
• Applied a periodically oscillating magnetic field to a 2D magnet.
• Analyzed the system's response across various field amplitudes and bias fields.

Main Results:

• Discovered a dynamically reentrant skyrmion phase, absent in equilibrium.
• This phase exists within a specific window of field parameters.
• The phase arises from an imbalance in skyrmion creation/annihilation, reversing topological charge.
• The reentrant phase is dependent on the dynamic response regime and suppressed at high frequencies.

Conclusions:

• Periodic driving is a viable nonequilibrium control parameter.
• This method allows for the stabilization and reversal of skyrmion topology.
• The findings open new avenues for manipulating topological magnetic states.