Enhanced magnetoelastic effect in Laves (Tb,Dy)Fe2 alloys with the joint introduction of Pr and Nd

Abstract

The structural and magnetoelastic properties of (Tb 0.3 Dy 0.7 ) 1-x (Pr 0.5 Nd 0.5 ) x Fe 1.93 (0 B x B 0.20) polycrystalline alloys have been investigated by means of X-ray diffraction (XRD), a vibrating sample magnetometer and a standard strain gauge technique. A single (Tb,Dy,Pr,Nd)Fe 2 Laves phase with a cubic MgCu 2 -type structure is formed when x B 0.12, while a small amount of impurities appear when x C 0.15. The easy magnetization direction at room temperature is detected toward \111[ axis. The analysis of XRD, magnetization and magnetostriction shows that the Pr and Nd elements joint introduction into (Tb,Dy)Fe 2 system can reduce the magnetocrystalline anisotropy and improve the magnetoelastic properties. The (Tb 0.3 Dy 0.7 ) 0.88 (Pr 0.5 Nd 0.5 ) 0.12 Fe 1.93 alloy exhibits a high low-field magnetostriction k a (*314 ppm/ 1 kOe), a large spontaneous magnetostriction coefficient k 111 (*1710 ppm), a giant saturation magnetostriction k S (*1060 ppm) and the low magnetocrystalline anisotropy at room temperature, and may make it a promising candidate for magnetostriction applications.

Dynamic magnetoelastic properties of TbxHo0.9−xNd0.1(Fe0.8Co0.2)1.93/epoxy composites

“…Moreover, NdFe 2 has a low magnetocrystalline anisotropy and a large crystal deformation along high-symmetry 1 1 1 axis (denoted as λ 111 , e.g. ∼3100 ppm at 15 K), accompanied by the easy magnetic direction (EMD) along the 1 0 0 axis other than EMD 1 1 1 for TbFe 2 [1,[8][9][10][11]. Recently, we have prepared the Nd-containing Lavesphase Tb x Ho 0.9−x Nd 0.1 (Fe 0.8 Co 0.2 ) 1.93 compounds and epoxy-bonded 1-3 type particulate composites, which had high static and quasi-static magnetoelastic properties at room temperature [12,13].…”