Anisotropy compensation and magnetostriction in TbxNd1−xFe1.9 cubic Laves alloys

Abstract

Polycrystalline TbxNd1−xFe1.9 (0⩽x⩽0.8) cubic Laves phase alloys with MgCu2-type structure were prepared by high-pressure synthesis and subsequent low-temperature annealing. The crystal structure, magnetic properties, and magnetostriction have been investigated. The change of easy magnetic direction from ⟨100⟩ to ⟨111⟩ with increasing x up to 0.1 is detected by Mössbauer spectra. In accordance with Mössbauer effect study, both magnetization and magnetostriction analyses show that TbxNd1−xFe1.9 is an anisotropy compensation system and the compensation point is close to x=0.1. The present work may open an avenue in searching magnetostrictive materials with inexpensive Nd.

Magnetic and magnetostrictive properties in high-pressure synthesized Dy1−xPrxFe1.9(0≤x≤1) cubic Laves alloys

“…This can be explained by single-ion model [16]: the saturation magnetostriction is proportional to M 3 SR , where M SR is the saturation magnetization of the rare-earth sublattice; since the average of M SR is the lowest at x = 0.4, the magnetostriction ( || − ⊥ ) should also show a minimum value. A similar behavior can also be found in some other heavy rare-earth and light rareearth mixed pseudobinary alloys, such as Tb 0.6 Pr 0.4 Fe 1.9 [17] and Tb 0.6 Nd 0.4 Fe 1.9 [18]. With x increasing from 0.4 to 1.0, the magnetostriction of the system increases monotonically, which should be ascribed to the larger magnetostriction of PrFe 1.9 than that of DyFe 1.9 .…”

Spin configuration and magnetostriction in Nd0.9Tb0.1(Fe1−xCox)1.9 (0≤x≤0.55) alloys

“…Therefore, in our present work, the formation of the cubic Laves phase should be ascribed to the effect of the high pressure. In consistence with the previous report, high-pressure synthesis is an effective method to prepare high-Nd content compounds [8,9].…”

“…4. That the EMD of Nd 0.9 Tb 0.1 Fe 1.9 lies along 1 1 1 at room temperature has been proved using Mössbauer effects [9]. The temperature dependence of ac initial susceptibility ac is an effective way to determine the spin-reorientation temperature T sr [21].…”

“…However, little attention be paid to light rare-earth Nd-based magnetostrictive alloys because NdFe 2 cubic Laves phase cannot be obtained under normal atmosphere [8]. Recently, we reported that Nd x Tb 1−x Fe 1.9 (0 ≤ x ≤ 1) cubic Laves alloys could be synthesized by a method of high-pressure annealing and the anisotropy compensation is realized in Nd 0.9 Tb 0.1 Fe 1.9 [9]. As we know, the magnetostrictive properties of the alloys are very sensitive to the compositions or the spin-reorientation temperature (T sr ).…”

Dynamic magnetoelastic properties of epoxy-bonded Sm0.88Nd0.12Fe1.93 pseudo-1-3 negative magnetostrictive particulate composite

“…On the side of the positive magnetostrictive alloys, several good light rare earth-substituted candidates have been synthesized by substituting light rare earth Pr or Nd for Tb and/or Dy in the Terfenol-D composition. [10][11][12] On the side of the negative magnetostrictive alloys, few reports have been made even though Sm 0.88 Nd 0.12 Fe 1.93 alloy has showed promise at room temperature. 13 We have succeeded in synthesizing Sm 1-x 15 and reporting their quasistatic magnetoelastic properties.…”