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First principles and Monte Carlo calculations of structural and magnetic properties of FeNiMnAl heusler alloys

MATEC Web of Conferences, ISSN: 2261-236X, Vol: 33
2015
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Conference Paper Description

The composition dependences of crystal lattice parameters, bulk moduli, magnetic moments, magnetic exchange parameters, and Curie temperatures in FeNiMnAl (0.2 ≤ x ≤ 1.8; 0.0 ≤ y ≤ 0.6) Heusler alloys are investigated with the help of first principles and Monte Carlo calculations. It is shown that equilibrium lattice parameters and Mn-Mn magnetic exchange interactions increase with increasing Fe content (x). A crossover from ferromagnetic to antiferromagnetic interaction between nearest neighbors Mn and Mn atoms was observed in compositions with x ≥ 1.4 and 0.2 ≤ y ≤ 0.6. Such magnetic competitive behavior points to a complex magnetic structure in FeNiMnAl. Calculated values of lattice parameters, magnetic moments, and Curie temperatures are in a good agreement with other theoretical results and available experimental data.

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