Spontaneous and external magnetic field-induced magnetostriction in RCo2-based multicomponent alloys

Abstract

The spontaneous and external magnetic field-induced magnetostrictions have been studied in multicomponent Tb0.3Dy0.35Ho0.35Co2 and Tb0.8Dy0.1Gd0.1Co2 alloys whose structures are isotypical to the C15 Laves phases. The temperature dependences of the lattice parameters have been measured in the range of 110–280 K. It has been found that the crystal lattice undergoes rhombohedral distortions at temperatures lower than the temperatures of magnetic ordering in these alloys (148.5 and 243 K, respectively). The temperature (4.2–280 K) and field (0–8 T) dependences of the longitudinal and transverse magnetostrictions have been studied. The high magnetoelastic effects have been detected.