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PROPIEDADES ESTRUCTURALES, MAGNÉTICAS E HIPERFINAS DE LA FERRITA MgFe2O4: ESTUDIO MEDIANTE CÁLCULOS AB-INITIO
STRUCTURAL, MAGNETIC AND HYPERFINE PROPERTIES OF THE FERRITE MgFe2O4: AN AB-INITIO CALCULATIONS

H. H. Medina Chanduví, Instituto de Física La Plata (IFLP) – CONICET, CCT La Plata CONICET, CP 1900 La Plata, Argentina, A. V. Gil Rebaza, L. A. Errico, Instituto de Física La Plata (IFLP) – CONICET, CCT La Plata CONICET, CP 1900 La Plata, Argentina, Departamento de Física, Fac. de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CP 1900 La Plata, Argentina
2021 Anales (Asociación Física Argentina)  

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We present here a first principles study of the structural, electronic, magnetic, and hyperfine properties of magnesium ferrite, MgFe2O4 (spinel structure). The study was carried out within the framework of Functional Density Theory (DFT) using the full potential linearized augmented plane waves method (FPLAPW) using both the Generalized Gradient (GGA) and the GGA+U approximations for the exchange and correlation potential. To discuss the magnetic ordering and the lowest energy structure of the
more » ... system we consider different distributions of Mg and Fe ions in both cationic sites of the spinel structure, as well as different spin configurations. Our calculations predict that the equilibrium structure corresponds to an inverted antiferromagnetic configuration, in which the magnetic moments of the Fe atoms located at sites A are ferromagnetically ordered among themselves and antiferromagnetically with respect to the Fe located at the sublattice of sites B. Our GGA calculations underestimate the energy band-gap of the system, while GGA+U predict a band-gap of 2.3 eV, in excellent agreement with the reported values. The results for the hyperfine properties at the Fe sites (isomer shift, quadrupole splitting and hyperfine field) are in excellent agreement with the Mössbauer spectroscopy results reported in the literature, giving support to the equilibrium structure predicted by FP-LAPW.
doi:10.31527/analesafa.2020.31.4.121 fatcat:dk5pevix2nhmldge6uldos3pci
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H. H. Medina Chanduví, Instituto de Física La Plata (IFLP) – CONICET, CCT La Plata CONICET, CP 1900 La Plata, Argentina, A. V. Gil Rebaza, L. A. Errico, Instituto de Física La Plata (IFLP) – CONICET, CCT La Plata CONICET, CP 1900 La Plata, Argentina, Departamento de Física, Fac. de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), CP 1900 La Plata, Argentina. "PROPIEDADES ESTRUCTURALES, MAGNÉTICAS E HIPERFINAS DE LA FERRITA MgFe2O4: ESTUDIO MEDIANTE CÁLCULOS AB-INITIO." Anales (Asociación Física Argentina) (2021) 121-126