T alloys

Dubovoy A.G., Perekos, A.E., Chuistov K.V. Structure and magnetic properties of small amorphous particles of metallic Fe-15 t.% alloy. Physics of Metals 1985 6(5) 1085-8. 

Many amorphous U(Th)-T alloys (T = Fe, Co, Ni) were prepared in the composition range 10-50 at.% of T. They were found, by Poon et al. (1985b), to be superconducting below 1 K (U-based) or below 4 K (Th-based). The slope... 

The magnetic properties of U-T alloys were studied by Cornelison et al. (1980). It was shown that for U66T34, T = Fe, Co, Ni, a cluster-glass behaviour is found below = 100 K. The magnetic moment was assumed to develop only for relatively high transition-metal concentrations. 

Fig. 7. Compositional variation of the Curie temperature for amorphous R,T,, alloys. After Hansen (1991) and references therein.

Eno] Enomoto, M., Maruyama, N., Wu, K.M., Tarui, T., Alloying Element Accumulation at Ferrite/Austenite Boundaries Below the Time-Temperature-Transformation Diagram Bay in an Fe-C-Mo Alloy , Mater. Sci. Eng. A, 343, 151-157 (2003) (Calculation, Experimental, Kinetics, Phase Diagram, Phase Relations, 27)... 

The interfaces may be regarded as compositionally modulated disordered R-T alloys because X-ray diffraction shows an amorphous structure in the interface region. In the next subsection a brief overview of the interactions and structures of R and R-T alloys is given, on the basis of which the magnetic structure of interfaces and the origin of PMA may be well understood. 

On the basis of the above consideration the magnetic structure of heavy R-T alloys in the interface region may have sperimagnetic features with random orientation of the local easy axes. For the material to show a macroscopic anisotropy, there must be an orientational coherence to these local anisotropy axes. The interfaces in R/T multilayers may have such desired structure to offer this orientational coherence. In sect. 3, the experimental evidence is presented and in sect. 4 a detailed model, which clearly shows such orientational coherence, is discussed. 

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