Coherent spin radiation by magnetic nanomolecules and nanoclusters

TL;DR

This paper investigates how magnetic nanomolecules and nanoclusters can produce coherent spin radiation, emphasizing the role of resonant circuits, sample shape, and orientation in optimizing superradiance and radiation intensity.

Contribution

It presents a numerical simulation study incorporating realistic dipole interactions to analyze conditions for superradiance in magnetic nanomolecules.

Findings

Superradiance occurs only with a resonant electric circuit.

Feedback mechanisms enable fast spin reversal and high radiation intensity.

Elongated samples aligned with the magnetic field produce the strongest radiation.

Abstract

The peculiarities of coherent spin radiation by magnetic nanomolecules is investigated by means of numerical simulation. The consideration is based on a microscopic Hamiltonian taking into account realistic dipole interactions. Superradiance can be realized only when the molecular sample is coupled to a resonant electric circuit. The feedback mechanism allows for the achievement of a fast spin reversal time and large radiation intensity. The influence on the level of radiation, caused by sample shape and orientation, is analysed. The most powerful coherent radiation is found to occur for an elongated sample directed along the resonator magnetic field.