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- W2085453476 abstract "Abstract The magnetic domain structure of near stoichiometric (Nd 11.8 Fe 82.3 B 5.9 ) nanocrystalline alloy ribbon has been examined using magnetic force microscopy (MFM) as a function of processing conditions. Amorphous structured ribbons of Nd 2 Fe 14 B with an average thickness of 25 μm were produced by chill block melt-spinning. Subsequently, samples were heat treated at 600°C for 4 min to produce a nanocrystalline structure consisting of Nd 2 Fe 14 B grains of average size ∼35 nm. These were compared to ribbons of the same composition, but melt spun directly to the nanocrystalline state, also with an average grain size of ∼35 nm. MFM imaging was undertaken using CoCr, NiFe and Fe/SiO 2 coated pyramidal Si tips. The as-cast amorphous ribbons exhibited weak magnetic contrast with a correlation length of 130±20 nm, but with a small elongation in one direction, as shown by Fourier transforms of the MFM images. Nanocrystalline samples produced by devitrification exhibited longer correlation lengths of 1000±50 nm and with a stronger angular component to the Fourier transform. The application of a 5 T field to the nanophase sample in a direction normal to the sample plane resulted in a reduction of the correlation length to 600±50 nm and a reduction in the directionality of the magnetic contrast. However, the application of a 5 T field in the plane of the ribbon resulted in an elongation of the contrast in a direction parallel to the applied field, irrespective of the in-plane field direction. In contrast, ribbon melt spun directly to a nanocrystalline structure exhibited a uniform Fourier transform both in the as-cast and remanent states. The length scale of dominant magnetic structure was 350±30 nm for the as-cast and 620±30 nm for the remanent state. Within the dominant magnetic structure, a finer structure was apparent, of a scale comparable to the grain size." @default.
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- W2085453476 date "1998-12-01" @default.
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- W2085453476 title "MFM of nanocrystalline NdFeB: a study of the effect of processing route on the micromagnetic structure" @default.
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- W2085453476 doi "https://doi.org/10.1016/s0304-8853(98)00278-9" @default.
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