Effect of Ho Doping and Annealing on Magnetostrictive Properties of Tb-Dy-Ho-Fe/Epoxy Composites

Abstract

The effect of Ho-doping and annealing on magnetostriction and magnetostriction hysteresis of Tb-Dy-Ho-Fe/ epoxy composites was investigated in this paper. The polymer bonded (Tb0.15Ho0.85Fe1.9)x+(Tb0.3Dy0.7Fe1.9)1-x composites (x=0.21, 0.25 and 0.31) were prepared and annealed in a vacuum magnetic heat treatment furnace at 20, 80, 100 and 150 °C. The microstructure of the sample was then observed by optical microscopy. The magnetostricion of the composites was studied by a standard strain gauge technique. The research results showed that when the Ho content x=0.31, the composites exhibited large magnetostriction and small magnetostriction hysteresis. When annealing temperature is 100°C, the composites have a maximum magnetostriction at 695 ppm.