Magnetostrictive strain effects in NdFe11Ti

Abstract

PACS 75.80.+q The magnetostriction of a polycrystalline NdFe 11 Ti compound in the temperature range 77 -300 K and in magnetic fields up to 15 000 Oe has been investigated. Below 160 K the magnetostriction is found to be negative. On increasing the temperature the sign of the magnetostriction changes and it reaches a maximum value at about 220 K. At about 160 K anisotropic magnetostriction becomes zero and volume magnetostriction increases rapidly beyond this temperature. The results are interpreted in terms of spin reorientation phenomena. This conclusion is confirmed from the measurement of low-field ac susceptibility in the temperature range 100 -300 K.

A comparative study on magnetostrictive strain in GdCo 5 and Gd 0.9 Pr 0.1 Co 5

“…The change of sign of K 1 occurs around temperatures close to that where anomalies on magnetostrctive strain curve have started. SR in Gd 0.9 Pr 0.1 Co 5 compound was confirmed by the low field ac-susceptibility measurements [6], where a wide peak appeared on this curve and it coincides with the magnetostrictive temperature anomalies. …”

“…The lattice parameters are given elsewhere [6]. Figure 1 shows the longitudinal magnetostriction, l l , as a function of temperature.…”

“…The samples preparation method is given in another work [6]. Measurements of magnetostriction were made using strain gauge method [7] in an applied field up to 1.5 T, and temperature range from 77 to 320 K. The strains were measured with field parallel and then perpendicular to the gauge.…”

Electron Diffraction of ThMn12/Th2Zn17-Type Structures in the Nd-Fe-Ti System

“…Intermetallic compounds with high Fe content and adopting the ThMn 12 structure have attracted considerable attention in the field of permanent magnets because of their relatively high Curie temperature, saturation magnetization, and magnetocrystalline anisotropy (Li & Coey, 1991; Suski, 1996). Rare-earth compounds based on the Th 2 Zn 17 structure have also been considered potentially interesting (Kong et al, 1994) in the quest for innovative and low-cost permanent magnet materials (Jian et al, 2000; Amirabadizadeh et al, 2004). As a result, these structures have been extensively investigated by powder X-ray diffraction (Chin et al, 1989; Jian et al, 2000; Yu et al, 2000).…”

“…Rare-earth compounds based on the Th 2 Zn 17 structure have also been considered potentially interesting~Kong et al, 1994! in the quest for innovative and low-cost permanent magnet materials~Jian et al, Amirabadizadeh et al, 2004!. As a result, these structures have been extensively investigated by powder X-ray diffraction~Chin et al, 1989;Jian et al, 2000;Yu et al, 2000!.…”