Journal
PHYSICAL REVIEW B
Volume 98, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.224201
Keywords
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Funding
- France-Argentina Project ECOS-Sud [A12E03]
- [PIP11220120100250CO/CONICET]
- [PICT2016-0069/FONCyT]
- [UNCuyo 06/C490]
- [UNCuyo 06/C017]
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We study the ultraslow domain-wall motion in ferromagnetic thin films driven by a weak magnetic field. Using time-resolved magneto-optical Kerr effect microscopy, we access to the statistics of the intermittent thermally activated domain-wall jumps between deep metastable states. Our observations are consistent with the existence of creep avalanches: roughly independent clusters with broad size and ignition waiting-time distributions, each one composed by a large number of spatiotemporally correlated thermally activated elementary events. Moreover, we evidence that the large-scale geometry of domain walls is better described by depinning rather than equilibrium universal exponents.
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