Abstract
We present a magnetic force microscopy and atomic force microscopy study of magnetic and crystalline microstructures of melt-spun binary Fe 50+ x Pt 50− x ( x=0−20) and ternary (Fe 0.5+ y Pt 0.5− y ) 82B 18( y=0−0.2) nanocomposite ribbons. It was confirmed that an ordered magnetically hard γ 1-FePt phase could be fully formed at x⩽10 in Fe 50+ x Pt 50− x ribbons. From the topographic images of the Fe 50+ x Pt 50− x and (Fe 0.5+ y Pt 0.5− y ) 82B 18 ribbons, it was found that the average crystal size D ¯ is large (∼1.1–3.9 μm) for the Fe 50+ x Pt 50− y ribbons without B, but that of the (Fe 0.5+ y Pt 0.5− y ) 82B 18 ribbons with invariable B content is much small ( ∼57–65 nm). Moreover, the magnetic force images with distinct contrast could be detected by MFM only in the ribbons with strong exchange-coupling interaction. Finally, it was found that for exchange-coupling nanocomposite ribbons, the strength of the exchange-coupling interaction can be reflected roughly by the root-mean-square roughness of phase shift, ( Δ φ ) rms , of magnetic force images and the ratio of the average domain width w ¯ to the average crystal size D ¯ .
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