Phys. Rev. Lett. 100, 167204 (2008) [4 pages]Scaling Behavior of the First Arrival Time of a Random-Walking Magnetic DomainReceived 3 January 2008; published 23 April 2008 We report a universal scaling behavior of the first arrival time of a traveling magnetic domain wall into a finite space-time observation window of a magneto-optical microscope enabling direct visualization of a Barkhausen avalanche in real time. The first arrival time of the traveling magnetic domain wall exhibits a nontrivial fluctuation and its statistical distribution is described by universal power-law scaling with scaling exponents of 1.34±0.07 for CoCr and CoCrPt films, despite their quite different domain evolution patterns. Numerical simulation of the first arrival time with an assumption that the magnetic domain wall traveled as a random walker well matches our experimentally observed scaling behavior, providing an experimental support for the random-walking model of traveling magnetic domain walls. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.167204
DOI:
10.1103/PhysRevLett.100.167204
PACS:
75.60.Ej, 05.40.Fb, 75.60.Ch, 75.40.Gb
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