Coherent radiation by magnets with exchange interactions

TL;DR

This paper proposes a theory for fast magnetization reversal in exchange-interaction magnetic systems, highlighting the potential for spin superradiance and applications in spintronics through feedback magnetic fields.

Contribution

It introduces a new theoretical model describing magnetization reversal driven by exchange interactions coupled with feedback magnetic fields, enabling self-organized spin superradiance.

Findings

Magnetization reversal can be rapid and self-organized.

The system can emit radiation through the coil sides.

Potential applications in spintronics are identified.

Abstract

A wide class of materials acquires magnetic properties due to particle interactions through exchange forces. These can be atoms and molecules composing the system itself, as in the case of numerous magnetic substances. Or these could be different defects, as in the case of graphene, graphite, carbon nanotubes, and related materials. The theory is suggested describing fast magnetization reversal in magnetic systems, whose magnetism is caused by exchange interactions. The effect is based on the coupling of a magnetic sample with an electric circuit producing a feedback magnetic field. This method can find various applications in spintronics. The magnetization reversal can be self-organized, producing spin superradiance. A part of radiation is absorbed by a resonator magnetic coil. But an essential part of radiation can also be emitted through the coil sides.