Magnetostriction of some rare earth-aluminum Laves phase compounds
Abstract
Anisotropic magnetostriction measurements of some R-Al2 (R=Gd, Dy, Ho and Er) compounds have been carried out from 4.2 K up to their Curie temperatures (Tc). 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 17×10-6, -1420×10-6, 60×10-6 and -920×10-6 for GdAl2, DyAl2, HoAl2 and ErAl2, respectively. A dramatic reduction in the magnitude of the strain observed for HoAl2 below 15 K may be associated with a change of easy direction of magnetization. For GdAl2, the strains observed above the saturation are found to be strongly field-dependent. The temperature dependence of magnetostriction for DyAl2 is interpreted in terms of the Callen and Callen's single-ion model. Large volume strains are obtained for these compounds (except for GdAl2). An attempt is made to estimate the anisotropic volume constant h3 at 4.2 K.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- November 1979
- DOI:
- 10.1063/1.326847
- Bibcode:
- 1979JAP....50.7707P
- Keywords:
-
- Aluminum Compounds;
- Magnetostriction;
- Rare Earth Compounds;
- Anisotropy;
- Curie Temperature;
- Isotherms;
- Magnetization;
- Temperature Dependence;
- Volumetric Strain;
- Solid-State Physics;
- 75.80.+q;
- 75.30.Gw;
- Magnetomechanical and magnetoelectric effects magnetostriction;
- Magnetic anisotropy