Magnetostriction of Tb–Dy–Fe alloy with different crystal axes orientation

Abstract

Based on the principle of energy minimum, magnetostriction of Tb–Dy–Fe alloy with different crystal axes under different compressive stress has been calculated using a three-dimensional anisotropy domain rotation model. Simulated results show that the magnetostriction property of 〈1 1 1〉-oriented single crystal is the best; saturation magnetostriction up to 2378 ppm has been obtained under compressive prestress of 24 MPa, which is very close to the experiment results. Saturation magnetostriction properties of 〈1 1 2〉-oriented and 〈1 1 0〉-oriented single crystal are very close under lower compressive prestress, while the 〈1 1 0〉-oriented ones have higher magnetostriction than 〈1 1 2〉-oriented ones under higher compressive prestress. In lower magnetic field, 〈1 1 0〉-oriented crystals achieve jump effect (1018 ppm at 715 Oe under 10 MPa) prior to 〈1 1 2〉-oriented ones, which indicates that it has fairly better low-magnetic field properties. These results agree well with the experimental results in previous literatures.