Synthesis and Magnetostrictive Properties of High-Pr Content  ${\rm Sm}_{1-x}{\rm Pr}_{x}{\rm Fe}_{1.9}$ Cubic Laves Alloys
Polycrystalline Sm<sub>1-</sub><i>x</i>Pr<i>x</i>Fe<sub>1.9</sub> (0.4 ≤ <i>x</i> ≤ 1.0) magnetostrictive alloys were synthesized by arc-melting and subsequent high-pressure annealing. Measurements of x-ray diffraction, magnetization, and magnetostriction were performed on the alloys. Due to the effects of high-pressure, the alloys are stabilized in cubic Laves phase with MgCu<sub>2</sub>-type structure. The Curie temperature of the cubic Laves phase decreases linearly with the increase of <i>x</i>, which can be associated with the decreasing strength of 3<i>d</i>-4<i>f</i> coupling. With increasing <i>x</i> , the anisotropy of the alloys first decreases to a minimum at <i>x</i> = 0.6 and then increases. The magnetostriction of Sm<sub>1-</sub><i>x</i>Pr<i>x</i>Fe<sub>1.9</sub> changes signs from negative into a positive at <i>x</i> = 0.6 . The saturation magnetostriction increases with increasing <i>x</i>, while the sample with <i>x</i> = 0.9 shows a peak at low magnetic fields.
Magnetostriction and magnetic anisotropy of (Sm,Ce)Fe2 compounds
The structural, magnetic and magnetostrictive properties of Sm(1-x)Ce(x)Fe(2) (0 <= x <= 1) Laves compounds have been investigated. The magnetostriction coefficient lambda(111) and the anisotropy of the Sm(1-x)Ce(x)Fe(2) compounds decrease with increasing Ce content. The decreasing of anisotropy results in an enhancement of the anisotropic magnetostriction at low magnetic fields for the compounds with a small amount of Ce substituted for Sm. (C) 2009 Elsevier B.V. All rights reserved.
Magnetic and magnetorestrictive properties of Sm1−xDyxFe2 compounds and its Mössbauer effect studies
Measurements of x‐ray diffraction, magnetization, magnetostriction, and Mossbauer effect were performed on a series of Sm1−xDyxFe2 samples (x=0, 0.1, 0.15, 0.25, 0.45, and 0.65). It is shown that the system retains the cubic MgCu2 structure over the whole range and the lattice constant decreases linearly with increasing x. Results of Mossbauer effect study at room temperature show that for a small amount of Dy substitution for Sm, x<0.15, easy axes of the magnetization keep in the [111] direction. For x≳0.15, the direction of easy axes rotates gradually from [111] for x=0, and 0.1 to [100] for x=0.45 and 0.65. The concentration dependence of the saturation magnetization exhibits a minimum at x=0.30 for 1.5 K and at x=0.45 for room temperature, reflecting the occurrence of the compensation of magnetic moments at various Sm/Dy ratios. For x=0.45 and 0.65, the pinning phenomenon of narrow domain walls was observed at low temperature. The magnetostriction was found to decrease with the increase in the Dy cont...