Magnetic Avalanches in Molecular Nanomagnets

Details Magnetic Avalanches in Molecular Nanomagnets Magnetic Avalanches in Molecular Nanomagnets

2010-01-18

arxiv.org/abs/1001.3112v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Review article for "Perspectives of Mesoscopic Physics - Dedicated to Prof Yoseph Imry's 70th Birthday"

Scientific paper

The magnetization of the prototypical molecular magnet Mn12-acetate exhibits a series of sharp steps at low temperatures due to quantum tunneling at specific resonant values of magnetic field applied along the easy c-axis. An abrupt reversal of the magnetic moment of such a crystal can also occur as an avalanche, where the spin reversal proceeds along a "deflagration" front that travels through the sample at subsonic speed. In this article we review experimental results that have been obtained for the ignition temperature and the speed of propagation of magnetic avalanches in molecular nanomagnets. Fits of the data with the theory of magnetic deflagration yield overall qualitative agreement. However, numerical discrepancies indicate that our understanding of these avalanches is incomplete.

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