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 ... continued below

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Im, M.-Y.; Lee, S.-H.; Kim, D.-H.; Fischer, P. & Shin, S.-C. February 4, 2008.

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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.

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  • Journal Name: Physical Review Letters

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  • Report No.: LBNL-1331E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 945365
  • Archival Resource Key: ark:/67531/metadc898117

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  • February 4, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Oct. 2, 2017, 5:36 p.m.

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Im, M.-Y.; Lee, S.-H.; Kim, D.-H.; Fischer, P. & Shin, S.-C. Scaling Behavior of the First Arrival Time of a Random-Walking Magnetic Domain, article, February 4, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc898117/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.