Structural, magnetic and magnetostrictive properties of Tb0.2Pr0.8(Fe0.4−xCo0.6+x)1.93 (0 ⩽ x ⩽ 0.2) alloys have been investigated by means of x-ray diffraction, ac initial susceptibility, a superconducting quantum interference device magnetometer and a standard strain gauge technique. A single (Tb, Pr)(Fe, Co)2 Laves phase with a cubic MgCu2-type structure is formed when 0.05 ⩽ x ⩽ 0.2. Increasing the Co content in the Tb0.2Pr0.8(Fe0.4−xCo0.6+x)1.93 alloys reduces the magnetocrystalline anisotropy constant K1 and improves the magnetostrictive properties at relatively low magnetic fields at room temperature. The Tb0.2Pr0.8(Fe0.35Co0.65)1.93 alloy with a single Laves phase has a spontaneous magnetostriction λ111 as high as 1900 ppm, a large magnetostriction λa (= λ∥ − λ⊥) at a relatively low magnetic field and a large λa/K1, and may make it a promising magnetostrictive material.
Spin-reorientation transitions in compounds have been studied by measuring the temperature dependence of the a.c. susceptibility and the magnetization. The angular dependence of the magnetization on the applied field was measured on magnetically aligned samples in a SQUID magnetometer. In , the easy magnetization direction at room temperature was determined by x-ray diffraction to be the c-axis; at low temperatures, the SQUID measurements show a cone to be stable. At temperatures between 170 and 250 K, the SQUID measurements display more complex behaviour, which is attributed to the occurrence of a first-order magnetization process in this compound. The easy magnetization direction of compounds with changes from easy c-axis at high temperatures via a basal plane to easy cone at low temperatures. The magnetic phase diagram of the system is given. For , the critical field of the FOMP transition below 230 K, which corresponds to the critical temperature of the first-order transition, and the anisotropy fields at temperatures ranging from 240 to 300 K have been further investigated by means of the SPD technique.
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