Stress–strain behaviors of 〈110〉-oriented Tb0.3Dy0.7Fe1.95 after magnetic annealing

Abstract

Compressive stress–strain behaviors in a 〈110〉-oriented crystal Tb0.3Dy0.7Fe1.95 after magnetic annealing have been investigated under a series of quasi-static magnetic fields, attempting to add more insight into the corresponding domain-switching process. The magnetically annealed crystal outputs larger final strains than the untreated one, although it exhibits similar stress–strain behaviors. An obvious improvement also occurs in the initial Young's modulus E0 after magnetic annealing. The corresponding domain switching processes under compressive stress have been discussed. Non-180° domain processes are favored because of the specific initial domain states, which can be reflected by the shortening of the flat stage in magnetostriction–magnetic induction (λ–B) curve and the increase of the critical field where maximum forced magnetostriction constant d33 locates.