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

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.362095· OSTI ID:280079

Holden, A P; Lord, D G; Grundy, P J ^[1]

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1. Physics Department, Joule Laboratory, University of Salford, M54WT (United Kingdom)

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 {l_brace}011{r_brace} and {l_brace}112{r_brace} surfaces of twinned Terfenol-D (Tb{sub 0.3}Dy{sub 0.7}Fe{sub 2}) 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 {l_angle}111{r_angle} direction to be estimated as 1.63{times}10{sup {minus}3} to within 8{percent}. 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. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 280079
• Report Number(s): CONF-951101--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
DOMAIN STRUCTURE
DYSPROSIUM COMPOUNDS
FERROMAGNETIC MATERIALS
IRON COMPOUNDS
LAVES PHASES
MAGNETOSTRICTION
MICROSCOPY
TERBIUM COMPOUNDS
TWINNING