The effect of magnetic annealing on the magnetostriction for Sm-Dy-Fe rod alloys

Abstract

The Sm0.86Dy0.14Fex (x = 1.85−2.05) magnetostrictive alloys have been prepared with arc-melting and then cast into a copper mold with a diameter of 8 mm. It is found that the magnetostriction (λ// − λ⊥) increases from −900 × 10−6 for untreated rod alloys to −1200 × 10−6 for magnetically annealed rod alloys at the magnetic field of 640 kA/m. In the magnetic annealing temperature range of 483−643 K, the magnetostriction value exhibits a peak at 543 K. The variation of magnetostriction and magnetization with magnetic fields has been determined and the mechanism of domains' movements has been discussed. This result is very important to improve the magnetostrictive property of Sm-Dy-Fe rod alloys.

Influence of Tb on easy magnetization direction and magnetostriction of PrFe1.9 alloy*

“…The binary C15 cubic Laves phase RFe 2 (R = rare-earth elements) compounds are known to exhibit giant magnetostriction, which has been widely used as magnetostrictive materials in transducers, spintronics, information storage, sensors, and the design of novel electronic devices. [1][2][3][4][5][6][7][8][9] Especially, the low-cost light rare earth PrFe 2 alloy, which has a large calculated magnetostriction (λ 111 ∼ 5600 ppm at 0 K) according to single ion model theory, has received much attention in recent years. [10][11][12][13][14] However, this alloy shows high magnetocrystalline anisotropy due to the strong anisotropic 4f shells, and thus it possesses high switching fields at low temperatures.…”