Piezomagnetic properties, saturation magnetostriction, and Delta E effect in DyZn at 77 K

Young's modulus, magnetization, and magnetostriction measurements were made as a function of applied magnetic field (0 < H < 160 kA/m) and compressive stress (8.5 MPa < \T\ < 57.3 MPa) in [100] single crystal DyZn at 77 K. Pi ezomagnetic d constants greater than 300 nm/A and changes in Young's modulu s greater than 40 GPa were found. Pronounced features are abrupt changes in the elastic moduli, magnetostriction, and coupling factors arising from "j umps" in the magnetization occurring as the moment changes from one easy [1 00] axis to another. The characteristic magnetic fields at which this chang e occurs depend strongly upon the stress induced magnetic anisotropy. Magne tomechanical coupling factors reach 0.91. (C) 1998 American Institute of Ph ysics. [S0021-8979(98)34511-9].