MAGNETOELASTIC PROPERTIES DEPENDENCE ON COMPRESSIVE STRESS IN 〈110〉 ORIENTED Tb0.45Dy0.55Fe1.95 POLYCRYSTALLINE ALLOYS WITH HIGH DRIVE LEVELS

Abstract

This paper presents the magnetoelastic properties for the relative high Tb / Dy composition ratio 〈110〉 oriented Tb 0.45 Dy 0.55 Fe 1.95 polycrystalline alloys. The simultaneous measurements of the magnetization and magnetostriction are carried out as a function of applied magnetic field range of 0 to 800 kA/m and compressive stress from 0 to 60 MPa. The maximum piezomagnetic coefficient $(d^{\rm max}_{33})$ and magnetostriction hysteresis (Wh) are obtained by differential calculation from the experimental curves. According to the increase of compressive stress, an obvious magnetostriction "jump" effect is observed, and the magnetostriction with the magnetic field of 800 kA/m (λ800) and magnetostriction hysteresis monotonously increase, while the maximum piezomagnetic coefficient increases first from 0 to 10 MPa and then decreases from 10 to 60 MPa. Here, results of measuring and calculating on this material are important complement to further understand the rules of the magnetoelastic properties in high Tb/Dy composition ratio Tb 0.45 Dy 0.55 Fe 1.95 polycrystalline alloys for theoretical approaches and modern technology applications.