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Magnetic phase separation in ordered alloys
Marcos, Jordi; Vives i Santa-Eulàlia, Eduard; Castán i Vidal, Maria Teresa
Universitat de Barcelona
We present a lattice model to study the equilibrium phase diagram of ordered alloys with one magnetic component that exhibits a low temperature phase separation between paramagnetic and ferromagnetic phases. The model is constructed from the experimental facts observed in Cu3-xAlMnx and it includes coupling between configurational and magnetic degrees of freedom that are appropriate for reproducing the low temperature miscibility gap. The essential ingredient for the occurrence of such a coexistence region is the development of ferromagnetic order induced by the long-range atomic order of the magnetic component. A comparative study of both mean-field and Monte Carlo solutions is presented. Moreover, the model may enable the study of the structure of ferromagnetic domains embedded in the nonmagnetic matrix. This is relevant in relation to phenomena such as magnetoresistance and paramagnetism
2010-05-04
Mecànica estadística
Transformacions de fase (Física estadística)
Mètode de Montecarlo
Aliatges
Statistical mechanics
Phase transformations (Statistical physics)
Monte Carlo method
Alloys
(c) The American Physical Society, 2001
Article
The American Physical Society
         

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