A. E. Grini, S. Salmi, A. Azouaoui, A. Hourmatallah, K. Bouslykhane, M. Hamedoun, N. Benzakour
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Magnetic Properties of Diluted Spinels MgxNi1−xFe2O4 Systems: Are Studied by Green’s Functions and Mean Field Theories
Many-body Green's function, and mean field theories have been developed for magnetic systems MgxNi1−xFe2O4. We apply this theory to evaluate thermal magnetization and magnetic susceptibility for different values of magnetic field and dilution x, by considering all components of the magnetisation when an external magnetic field is applied in (x-z)-plane. The critical temperatures of MgxNi1−xFe2O4 systems in the range 0 ≤ x ≤ 1 have been deduced. The Green's function results are compared with the results of high temperature series expansion technique, and experimental magnetic measurements.
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