Abstract
First principles calculations of structural and magnetic properties of the Fe2MnGa Heusler alloy with face-centered cubic, have been studied using a full potential linearized augmented plane wave within the density-functional theory. Partial and total magnetic moments of Fe, Mn and Ga have been determined as well the bulk modulus using the generalized gradient approximation proposed by Wu and Cohen. Ferromagnetic interactions between next-nearest neighbors, (Fe-Fe, Mn-Mn; JFe-Fe > 0 and JMn-Mn > 0) in addition to the ferrimagnetic Fe-Mn (JFe-Mn < 0) within FMG Heusler alloy are considered. Fe2MnGa exhibits spin compensation temperatures and a first-order reentrant behavior. The studied system undergoes a first-order phase transition between an ordered ferrimagnetic to a paramagnetic. Transition TC, compensation TComp and first order phase transition, Tt points have been determined using Monte Carlo simulation; they are around 750, 400, 684 K, respectively. Magnetic hysteresis cycle has been found for different temperatures; it has been 190, 210 and 230 K.
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