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Elsevier, Journal of Magnetism and Magnetic Materials, 1-2(188), p. 109-118

DOI: 10.1016/s0304-8853(98)00179-6

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The effect of phase constitution on the magnetic structure of nanophase NdFeB alloys observed by magnetic force microscopy

Journal article published in 1998 by M. A. Al-Khafaji, W. M. Rainforth ORCID, M. R. J. Gibbs, H. A. Davies, J. E. L. Bishop
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Magnetic force microscopy (MFM) has been employed to image the magnetic structure in nanocrystalline melt spun ribbon samples of NdFeB alloys of three markedly different and contrasting compositions: Low-Nd (Nd9.5Fe84.5B6) containing Nd2Fe14B and α-Fe phases, stoichiometric (Nd11.8Fe82.3B5.9), and high-Nd (Nd18Fe76B6) containing Nd2Fe14B and Nd-rich phases. It was found that the magnetic domain length scale is significantly larger than the mean Nd2Fe14B grain size (∼35nm) in each case, although small changes in force gradient occurred down to ∼20nm. However, both the domain length scale and the tip–sample interaction `strength' were found to decrease with increasing Nd-content. An interpretation of these results in terms of the microstructure is given.