Phys. Rev. Lett. 99, 027207 (2007) [4 pages]Spin Precession and AvalanchesReceived 25 April 2006; revised 9 May 2007; published 13 July 2007 In many magnetic materials, spin dynamics at short times are dominated by precessional motion as damping is relatively small. We describe how avalanches evolve under these conditions. The growth front is spread out over a large region and consists of rapidly fluctuating spins often above the ferromagnetic transition temperature. In the limit of no damping the system will transition to an ergodic state if the initial instability is large enough, but otherwise can die out. This dynamic nucleation phenomenon is analyzed theoretically and the implications for real materials are discussed. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.027207
DOI:
10.1103/PhysRevLett.99.027207
PACS:
75.40.Gb, 05.45.Jn, 75.40.Mg, 75.60.Ej
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