Power-law scaling behavior in Barkhausen avalanches of ferromagnetic thin films
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چکیده
We report direct domain observations of Barkhausen avalanches at criticality in Co and MnAs thin films investigated by means of a magneto-optical microscope magnetometer, capable of time-resolved domain observation in real time. Through a statistical analysis of the fluctuating size of Barkhausen jump from numerous repetitive experiments for each sample, the distribution of Barkhausen jump size is found to exhibit a power-law scaling behavior with the critical exponent of 1.33 in both systems. This value is consistent with the twodimensional prediction of a theoretical model proposed by Cizeau et al. [Phys. Rev. Lett. 79 (1997) 4669]. r 2006 Elsevier B.V. All rights reserved. PACS: 75.60.Ej; 05.40. a; 75.60.Ch; 75.70.Ak
منابع مشابه
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تاریخ انتشار 2007