Transition from antiferromagnetic to ferromagnetic

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. 

A very detailed analysis would most probably reveal that, similarly to the case of the Ho compounds, the transition from paramagnetism to the HoP structure or antiferromagnetism is not a direct one. Perhaps there is an intermediate (ferromagnetic ) structure or at least the ordering temperatures observed are of a tricritical nature. 

It was experimentally shown in Ref [34], that transition from antiferromagnetic phase A at small x with increase of concentration to ferromagnetic state with = 0 = 90° (in our... 

Ac-susceptibility measurements by Morellon et al. (2000) showed, that (on heating) Gdj(Sio.iGeo.9)4 undergoes a first-order transition from a ferromagnetic to an antiferromagnetic state at 7c = 81 K, followed by a second-order transition to the paramagnetic state at 7n = 127 K. Measurements of the thermal dependence of the lattice parameters... 

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