Surface deformations and domains in Terfenol-D by scanning probe microscopy

This paper reports the first direct measurements of the deformations in the surface of a ferromagnet caused by magnetostrictive lattice strains in neighboring magnetic domains. Observations of the {011} and {112} surfaces of twinned Terfenol-D (Tb0.3Dy0.7Fe2) crystals by atomic force microscopy reve...

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Bibliographic Details
Published in:Journal of applied physics 1996-04, Vol.79 (8), p.6070-6072
Main Authors: Holden, A. P., Lord, D. G., Grundy, P. J.
Format: Article
Language:English
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Summary:This paper reports the first direct measurements of the deformations in the surface of a ferromagnet caused by magnetostrictive lattice strains in neighboring magnetic domains. Observations of the {011} and {112} surfaces of twinned Terfenol-D (Tb0.3Dy0.7Fe2) crystals by atomic force microscopy reveal the deformation domains previously imaged by optical microscopy and predicted by recent theory. The surface topography has been imaged in the remanent and ac demagnetized states and measurements of the deformation gradients have enabled the magnetostriction constant in the 〈111〉 direction to be estimated as 1.63×10−3 to within 8%. All theoretically predicted deformation domains have been observed and, in particular, the exact compatibility of such deformations across the growth twin boundaries is clearly revealed. The magnetic domains associated with the observed deformations are inferred from magnetic force microscopy observations which yield complex contrast patterns.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.362095