压应力对Fe_(0.81)Ga_(0.19)单晶磁化和磁致伸缩的影响

Effect of compressive stress on the magnetization and magnetostriction of Fe_(0.81)Ga_(0.19) alloy

研究了Fe0.81Ga0.19合金单晶沿[100]方向的磁机械效应和磁致伸缩效应.基于Stoner-Wohlfarth模型,通过数值计算获得了在压应力和外磁场联合作用下磁化强度的方向余弦.研究表明,随着压应力的增加,退磁态下合金中的磁各向异性会由三轴各向异性向双轴各向异性转变.这使得合金中90°畴的体积分数增加,导致磁致伸缩效应增大.

The magnetomechanical effect and the magnetostriction in the 100-oriented single crystal of Fe0.81Ga0.19 alloy have been investigated on the basis of Stoner-Wohlfarth model.The results have shown that in the demagnetized state the degeneracy of the resultant anisotropy in the alloy from the original cubic magnetocrystalline anisotropy into the biaxial anisotropy occurs under a critical stress.This leads to an increase in the fractional occupancy of 90° domain which causes an increase the bulk magnetostriction.