Antiferromagnetic to ferromagnetic transition

It should be mentioned that all these results have been obtained within the molecular-field approximation. In the antiferromagnetic state near the Neel temperature this approximation becomes insufficient, because the effect of spatial spin correlations must be taken into account. In a later published paper Yamada and Takada (1974) applied the RPA for the spin-correlation function. Compared with the results of the molecular-field approximation, p(if)/p(0) shows a pronounced increase around the antiferromagnetic to ferromagnetic transition point, The results of these calculations are sketched bj the dashed line in fig. 5 (Yamada and Takada 1974). 

Magnetic properties of FeC03 in the vicinity of the phase transition from antiferromagnetic to ferromagnetic [9, 10]... 

If n8p 3, the transition from antiferromagnetism to ferromagnetism must occur at or before a-Fe since iron has eight outer electrons. From equation 185, the atomic moment of ferromagnetic a-Fe is uFe = (2 + 6tt,P)/XB, where 8nsp < 0.3. 

The transition from antiferromagnetism to ferromagnetism at stoichiometric composition is ascribed to Fe atoms entering Ti sites in the C14 (Laves phase) structure... 

FeCOa can show a transition from antiferromagnetic to ferromagnetic ordering in very large applied fields (metamagnetism) [51] in the same way as already described for FeCla- In a field of 100 kG the sublattice with spins normally antiparallel to the field have a faster relaxation time than the parallel sublattice. Consequently as the temperature is raised the resonance lines from the former show line broadening as shown in Fig. 6.16. The outer line on the... 

Woolf, L.D. and M.B. Maple, 1981, Transition from antiferromagnetism to ferromagnetism in the superconducting pseudoternary system (Snii 4ErJRh4B4, in Ternary Superconductors, Proc. Intern. Conf. on Ternary Superconductors, Lake Geneva, WI, USA (1980), eds. G.K. Shenoy, B.D. Dunlap and F.Y. Fradin (North-Holland, Amsterdam) pp. 181-184. 

Ce3Cu3Sb4 was found to be a semiconducting ferromagnet with ferromagnetic transition temperature, Tm = 10 T while GdTTitSh4 was reported to be a metallic antiferromagnet with 7n = 12K(Patil et al., 1996). 

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