Dynamic characteristics of Tb-Dy-Fe polycrystals with < 110 > axial alignment

摘要

The magnetostriction and dynamic characteristics of Tb_(0.27)Dy_(0.73)Fe_2 polycrystals with < 110 > axial alignment were investigated by standard strain gauge, two coil induction and lock-in amplifier techniques. It is found that the magnetostriction of the sample quickly increases with increasing magnetic fields when H ≤ 80 kA/m under a pressure of 5 or 10 MPa and a "jump" effect occurs during the magnetization process. The dynamic strain coefficient, d_(33), dynamic incremental permeability, μ_(33), and magneto-mechanical coupling coefficient, k_(33), for the Tb_(0.3)Dy_(0.7)Fe_2 rod polycrystal sample with < 110 > axial alignment were measured and discussed. The Tb_(0.27)Dy_(0.73)Fe_2 polycrystals with < 110 > axial alignment possesses excellent magnetostrictive properties along the < 110 > rod direction in low magnetic fields and it is very useful in application of industry.