Ignition and Propagation of Magnetic Avalanches in Mn$_{12}$-Acetate: the effect of quantum tunneling

Autor:	McHugh, S., Jaafar, R., Sarachik, M. P., Myasoedov, Y., Finkler, A., Shtrikman, H., Zeldov, E., Bagai, R., Christou, G.
Rok vydání:	2007
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	Using a wire heater to ignite magnetic avalanches in fixed magnetic field applied along the easy axis of single crystals of the molecular magnet Mn$_{12}$-acetate, we report fast local measurements of the temperature and time-resolved measurements of the local magnetization as a function of magnetic field. In addition to confirming maxima in the velocity of propagation, we find that avalanches trigger at a threshold temperature which exhibits pronounced minima at resonant magnetic fields, demonstrating that thermally assisted quantum tunneling plays an important role in the ignition as well as the propagation of magnetic avalanches in molecular magnets. Comment: 4 pages, 5 figures; modified claims
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0708.0222 Zobrazit plný text záznamu View this record from Arxiv