Frequency Adapted Phase Transition of Interacting Nano-Magnetic Ensemble

TL;DR

This paper reports a novel frequency-induced phase transition in nano-magnetic ensembles, revealing new physical insights and potential applications in magnetic device design through combined experimental and simulation studies.

Contribution

It introduces a new type of phase transition driven by frequency changes in an interacting nano-magnetic system, supported by experimental and simulation evidence.

Findings

Frequency change induces paramagnetic to diamagnetic transition.

Simulation results agree with experimental observations.

Highlights potential for magnetic device innovation.

Abstract

Each single domain nano-magnet acts as a magnetic dipole in addition it oscillates its magnetization about the easy axis and rotates coherently depending upon temperature and anisotropy. In an ensemble of nano-magnets, the relaxation time of a nano-magnet tunes with the long range dipolar interaction which in turn is determined by the particle size, density and the number of nano-magnets present in the ensemble. Hence, the aggregation of interacting nano-magnetic dipoles, demonstrates both experimentally and theoretically as a model system to detect intriguing co-operative physical phenomena. Here we show a new variant of phase transition from paramagnetic to diamagnetic phase by changing the frequency of the applied sinusoidal magnetic field for a nano-magnetic ensemble. This phenomenon unravels a new insight of physics and it may be significant on the design and development of magnetic devices. The simulation of the system is well in agreement with the experimental results.