Spin reorientation temperature

Fig. 34. Temperature dependence of the hyperfine field components along the tetragonal b and c axes, (W, r)b and (Whf)c, of a GdNi2B2C sample, reflecting the temperature dependence of the corresponding components of the Gd magnetic moment. The lines leading to the ordering temperature Tn = 20 K and the spin reorientation temperature Tr = 14 K are guides for the eye (after Tomala et al. 1998).

Magnetic properties of R2Co14B compounds. The values listed under Tc and Ts represent Curie temperatures and spin reorientation temperatures. The values of the saturation magnetization (7S), saturation moment (Ms) and the anisotropy constant (K ) refer to 4.2 K. References to literature data used to obtain these values are indicated in brackets. In most cases single-crystal data were used, in other cases average values obtained on aligned powders were listed. 

Fig. 27. Concentration dependence of the spin reorientation temperatures in (Nd1 xRJt)2Fe14B for...

The thermal expansion behaviour in the magnetically ordered regime is closely connected with the pressure dependence of the Curie temperature. Measurements of Tc as a function of pressure were made on Nd2Fe14B by Fukamichi et al. (1986) and for several other R2Fe14B compounds by Kamarad et al. (1987) and Nagata et al. (1987). These authors showed that the Curie temperature of these compounds decrease strongly with applied pressure. By contrast, Kamarad et al. found that the spin reorientation temperature remains unaffected under pressure. 

Fig. 26. Hyperfine fields, at different crystallographic sites for (a) R=Nd, (b) R=Tb and (c) R=Dy versus temperature in RFe,Ti alloys, obtained by Fe ME experiments. The discontinuity corresponds to the spin-reorientation temperature, (B.-P. Hu et al. 1989b).

Fig. 30. Curie points, (circles), spin-reorientation temperatures, (diamonds) and saturation magnetic moments at 1.5 K (triangles, right-hand scale) versus V concentration x for NdFe,2, V, (H. Yang et al. 1993).

Fig. 39. (Lower panel) Curie points and spin-reorientation temperatures 2 sr, sud (i4>per panel) lattice parameters (a, left-hand scale, circles c, right-hand scale, triangles) versus Co concentration x in TbFE ft,, Co,W2 alloys (Jurczyk and Rao 1991).

Fig. 7. The influence of certain scattering or transport mechanisms on the contributions to thermal conductivity (the symbol is given in the lower right comer of each rectangle) in three temperature regions. 7 n> 7c and T, are the Nccl, Curie and spin reorientation temperatures, respectively.

Fig. 161. FcjBOs sc (dotted line) and (Feo,996COo,oo4)3B06 sc (solid line). Temperature dependence of M,. is the spin reorientation temperature [74H9].

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