Magnetostriction of some rare earth-aluminum Laves phase compounds
Anisotropic magnetostriction measurements of some R-Al/sub 2/ (R=Gd, Dy, Ho and Er) compounds have been carried out from 4.2 K up to their Curie temperatures (T/sub c/). Magnetic fields (H) up to 2.5 Tesla were applied. The extrapolated (to 1/H=0 for H>1.4 Tesla) saturation magnetostrictions determined at 4.2 K are 17 x 10/sup -6/, -1420 x 10/sup -6/, 60 x 10/sup -6/ and -920 x 10/sup -6/ for GdAl/sub 2/, DyAl/sub 2/, HoAl/sub 2/ and ErAl/sub 2/, respectively. A dramatic reduction in the magnitude of the strain observed for HoAl/sub 2/ below 15 K may be associated with a change of easy direction of magnetization. For GdAl/sub 2/, the strains observed above the saturation are found to be strongly field-dependent. The temperature dependence of magnetostriction for DyAl/sub 2/ is interpreted in terms of the Callen and Callen's single-ion model. Large volume strains are obtained for these compounds (except for GdAl/sub 2/). An attempt is made to estimate the anisotropic volume constant h/sub 3/ at 4.2 K.
- Research Organization:
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pa. 15260
- OSTI ID:
- 5848717
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:B11; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
ANISOTROPY
CURIE POINT
DYSPROSIUM ALLOYS
ERBIUM ALLOYS
GADOLINIUM ALLOYS
HOLMIUM ALLOYS
INTERMETALLIC COMPOUNDS
LAVES PHASES
MAGNETIC FIELDS
MAGNETIC PROPERTIES
MAGNETOSTRICTION
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE