Domain observation and magnetostriction in Tb sub 0. 3 Dy sub 0. 7 Fe sub 2 twinned single crystals

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348938· OSTI ID:5692323

Teter, J P; Mahoney, K ^[1]; Al-Jiboory, M; Lord, D G ^[2]; McMasters, O D ^[3]

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1. Naval Surface Warfare Center, 10901 New Hampshire Avenue, Silver Spring, Maryland 20903-5000 (USA)
2. Department of Pure and Applied Physics, University of Salford, Salford M5-4WT, (United Kingdom)
3. Edge Technologies, Ames, Iowa 50011 (USA)

The ternary alloy Tb{sub 0.3}Dy{sub 0.7}Fe{sub 2} (Terfenol-D) exhibits the largest known magnetostriction to anisotropy ratio near room temperature. To better determine the interaction between the elastic and magnetic properties of this material, a stoichiometric twinned single crystal was grown by a free-standing float-zone technique. Observations using Scanning electron microscopy and energy dispersive spectroscopy confirmed that the sample was free of the normally present rare-earth (RE) eutectic phase and simultaneously free of Widmanstatten precipitate (RE Fe{sub 3}). A bar with (111) and (1{bar 1}0) faces perpendicular to the (11{bar 2}) growth direction was examined. Also, a (11{bar 1}) slab was cut from the boule. This slab was studied along the (11{bar 1}) and (1{bar 1}0) directions with prestress applied along the (11{bar 1}). This is the first report of the effects of applying prestress and magnetic fields in a direction not collinear with the (11{bar 2}) growth direction. From magnetization ({ital M}) and magnetostriction ({lambda}) measurements as a function of field, prestress, and temperature, we determined the hysteresis and saturation parameters. These measurements do not indicate the (1{bar 1}0) {lambda} and {ital M} behaviors found previously for RE-rich Terfenol-D. Domain observations with differential phase contrast and x-ray topography have shown different orientations in the twin and parent sections of the (11{bar 1}) specimen. The observed structures can be interpreted as arising from domains with magnetization components normal to the surface. The domain observations on the (111) and (1{bar 1}0) bar faces and on the (11{bar 1}) slab correlate with each other with respect to orientations and domain interpretations.

• OSTI ID: 5692323
• Journal Information: Journal of Applied Physics; (USA), Vol. 69:8; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DYSPROSIUM ALLOYS
MAGNETOSTRICTION
IRON ALLOYS
TERBIUM ALLOYS
DOMAIN STRUCTURE
HYSTERESIS
MAGNETIZATION
PHASE DIAGRAMS
STOICHIOMETRY
TERNARY ALLOY SYSTEMS
TWINNING
ALLOY SYSTEMS
ALLOYS
DIAGRAMS
MAGNETIC PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
360104* - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies