Enhanced Nonadiabaticity in Vortex Cores due to the Emergent Hall Effect

Area of Science:

• Condensed matter physics
• Materials science
• Spintronics

Background:

• Magnetic vortex cores exhibit complex dynamics.
• Understanding nonadiabaticity is crucial for spintronic device applications.
• The origin of enhanced nonadiabaticity in magnetic textures remains an active research area.

Purpose of the Study:

• To investigate the origin of enhanced nonadiabaticity in magnetic vortex cores.
• To precisely measure the nonadiabaticity parameter using advanced imaging techniques.
• To theoretically explain the experimentally observed nonadiabaticity.

Main Methods:

• Dynamic imaging of magnetic vortex core gyration using scanning transmission x-ray microscopy (STXM).
• High-precision measurement of the nonadiabaticity parameter.
• Theoretical modeling to elucidate the role of spin currents and emergent Hall effect.

Main Results:

• Experimentally measured high nonadiabaticity in magnetic vortex cores with a high confidence upper bound.
• Theoretical demonstration that local spin currents, driven by a texture-induced emergent Hall effect, explain the observed nonadiabaticity.
• Established the strong dependence of magnetic damping (α) and nonadiabaticity (β) on magnetic texture topology.

Conclusions:

• The enhanced nonadiabaticity in magnetic vortex cores is attributed to local spin currents and emergent Hall effects.
• A high ratio of nonadiabaticity to damping (β/α > 1) is characteristic of topological magnetic textures like vortex cores and Skyrmions.
• This work provides fundamental insights into the dynamics of magnetic textures and their potential for future spintronic technologies.