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The domain structure of the nanocrystalline Fe 91 Zr 7 B 2 alloy at the optimum soft magnetic state was studied by means of magnetic force microscopy (MFM). Curved domains separated by 180° walls were observed. The domain wall width (∼πL ex , where L ex is the exchange correlation length) was estimated to be less than 2±0.3 μm from the MFM image...
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