دراسة الثأتيرية المغناطيسية لنظام فيريمغناطيسي من الرتبة (2/5 و 2/7)
DOI:
https://doi.org/10.59743/jbs.v33i2.219Keywords:
Ferrimagnetic system, Critical temperatures, Magnetic susceptibility, First order phase transition, Ising ModelAbstract
The research studies the magnetic effect of a ferrimagnetic system of a scheme diagram )SA=5/2 ، SB=7/2(. which applied mean field theory for based and Bogoliuboy's inequality to find the Ising model consisting of two sub-lattices, the first being a sub-lattice (A) with probabilities of spin magnetic moments (SA = ± 5/2, ± 3/2, ± 1/2) and the single crystal field (DA), and the second is a sub- lattice (B) with probabilities of spin magnetic moments (SB = ± 7/2, ± 5/2, ± 3/2, ± 1/2) and the mono-crystal field (DB).
The zero-ground scheme was obtained and its phases consisting of twelve effective phases were determined using the internal energy equation, and selected several points were of the zero diagram to determine the behavior of the susceptibilities, so found that it increases with increasing temperature until it reaches the critical degree, and then decreases with increasing temperature ,and so, that it is very little when higher the temperature, but at some points, especially when it is close to the boundaries when the phase transition of the first order, its effect behavior is unusual as the magnetic effect increases greatly before it reaches the temperature to the critical degree.
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