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이헌성(Hun-Sung Lee),류광수(Kwang-Su Ryu),신성철(Sung-Chul Shin),강임석(Im-Seok Kang) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.5
We report a direct observation of Barkhausen avalanches in 50-㎚ Fe film, using a magneto-optical microscope magnetometer, capable of time-resolved domain observation. The time-resolved domain-evolution patterns exhibit that the occurrence of Barkhausen jump is random with respect to interval, size, and location. From the repetitive measurements more than 1000 times, we found that the probability distribution of Barkhausen jump size follows a power-law distribution and the critical exponent reveals the value of 1.14 ± 0.03.