Scaling behavior of the first arrival time of a random-walking magnetic domain

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2008-04
Language
English
Article Type
Article
Keywords

BROWNIAN-MOTION; POWER LAWS; MICROSCOPE; DYNAMICS; WALL

Citation

PHYSICAL REVIEW LETTERS, v.100, no.16

ISSN
0031-9007
DOI
10.1103/PhysRevLett.100.167204
URI
http://hdl.handle.net/10203/13962
Appears in Collection
RIMS Journal Papers
Files in This Item
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