Direct observation of individual Barkhausen avalanches in nucleation-mediated magnetization reversal processes

Im, Mi-Young; Fischer, Peter; Kim, Dong-Hyun; Shin, Sung-Chul
November 2009
Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p182504
Academic Journal
We report the scaling behavior of Barkhausen avalanches [H. Barkhausen, Z. Phys. 20, 401 (1919).] along the hysteresis loop of a CoCrPt alloy film with perpendicular magnetic anisotropy for every field step of 200 Oe. Individual Barkhausen avalanches are directly observed via soft x-ray microscopy with a spatial resolution of 15 nm. The Barkhausen avalanches exhibit a power-law scaling behavior, where the scaling exponent of the power-law distribution drastically changes from 1±0.04 to 1.47±0.03 as the applied field approaches the coercivity of the CoCrPt film. We infer that this is due to the coupling of adjacent domains.


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