Pulsed field studies of the magnetization reversal in molecular nanomagnets

TL;DR

This study investigates how rapid pulsed magnetic fields affect magnetization reversal in Mn12 molecular nanomagnets, revealing shifts in magnetization steps that align with collective dipolar relaxation theory.

Contribution

First experimental analysis of magnetization reversal in Mn12 nanomagnets under high sweep rate pulsed fields, confirming theoretical predictions.

Findings

Magnetization steps shift with increasing sweep rate.

Shifts are consistent with collective dipolar relaxation theory.

Data expand understanding of dynamic magnetic behavior in molecular magnets.

Abstract

We report experimental studies of crystals of Mn12 molecular magnetic clusters in pulsed magnetic fields with sweep rates up to 4x10^3 T/s. The steps in the magnetization curve are observed at fields that are shifted with respect to the resonant field values. The shift systematically increases as the rate of the field sweep goes up. These data are consistent with the theory of the collective dipolar relaxation in molecular magnets.