Abstract
We investigate magnetic and crystalline microstructures of melt-spun(Fe0.675Pt0.325)100−xBx (x = 12, 14,16, 18, 20) nanocomposite ribbons after optimal thermal treatment usinga magnetic force microscope. The magnetic microstructures arecharacterized by darker spots adjacent to brighter ones in a sub-microscale and in random distribution. It is found that the strength of theexchange coupling interaction between the crystals in the 10–100 nmscale, implied by the maximum value (δM)max of theHenkel plot, could be roughly described by the ratio of theaverage width of the magnetic spots w̄ to the average crystalsize D̄ for the ribbons. Moreover, we find that the intrinsiccoercivity jHc of the ribbons is sensitive to theircrystal sizes, and the smaller D̄, the higher jHc.Finally, by using roughness analysis, the curve of the rootmean square values (δϕ)rms of the phase shift of the magneticforce images versus the boron content x is obtained, which isqualitatively consistent with that of the magnetization σ12 kOe ofthe ribbons versus x.
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