Tuning Magnetic Avalanches in Mn12-ac
S. McHugh, Bo Wen, Xiang Ma, M. P. Sarachik, Y. Myasoedov, E. Zeldov,, R. Bagai, and G. Christou
TL;DR
This study investigates how magnetic avalanches in Mn12-acetate can be controlled and characterized using time-resolved local magnetization measurements, confirming theoretical predictions of magnetic deflagration speeds.
Contribution
It provides the first systematic experimental analysis of magnetic avalanche control in Mn12-acetate, validating the theory of magnetic deflagration with detailed measurements.
Findings
Propagation speeds match theoretical predictions
Avalanches can be triggered at different magnetic fields
Initial magnetization influences avalanche dynamics
Abstract
Using micron-sized Hall sensor arrays to obtain time-resolved measurements of the local magnetization, we report a systematic study in the molecular magnet Mn-acetate of magnetic avalanches controllably triggered in different fixed external magnetic fields and for different values of the initial magnetization. The speeds of propagation of the spin-reversal fronts are in good overall agreement with the theory of magnetic deflagration of Garanin and Chudnovsky \cite{Garanin}.
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