Alessandro Magni et al J. Stat. Mech. (2009) P01020 doi:10.1088/1742-5468/2009/01/P01020
Alessandro Magni1, Gianfranco Durin1,2, Stefano Zapperi2,3 and James P Sethna4
Show affiliationsPart of Focus on Unsolved Problems of Noise in Physics, Biology and Technology
Magneto-optical methods allow us to observe the dynamics of domain wall motion, but this is intrinsically a very noisy process. We discuss a new method allowing us to reduce the measurement noise, taking advantage of the acquisition of a whole temporal sequence of images.
The resulting avalanche distributions give interesting hints as to the magnetization dynamics, but are strongly dependent on the size of the observation windows chosen. We investigate the effects of window size by studying finite-size scaling, and use this to extract the fractal dimension critical exponent 1/σν.
75.70.Ak Magnetic properties of monolayers and thin films
78.20.Ls Magnetooptical effects
75.70.Kw Domain structure (including magnetic bubbles)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 01 (January 2009)
Received 10 June 2008, accepted for publication 7 July 2008
Published 5 January 2009
Alessandro Magni et al J. Stat. Mech. (2009) P01020
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