Gd impurity effect on the magnetic and electronic properties of hexagonal Sr ferrites: A case study by DFT

doi:10.1088/1674-1056/ab8d9f

Abstract The electronic and magnetic properties of strontium hexa-ferrite (SrFe₁₂O₁₉) are studied in pure state (SrFe₁₂O₁₉) and with dopant in the positions 2 and 3 of Fe atoms (SrGdFe₁₁O₁₉-I and SrGdFe₁₁O₁₉-Ⅱ, respectively) by utilizing a variety of the density functional theory (DFT) approaches including the Perdew-Burke-Ernzerhof generalized gradient approximation (PBE-GGA) and GGA plus Hubbard U parameter (GGA+U). The pure SrFe₁₂O₁₉ is a hard magnetic half-metal with an integer magnetic moment of 64.00μ_B, while using the GGA+U functional, the magnetic intensity increases, resulting in a magnetic semiconductor with a high integer magnetic moment of 120μ_B. By doping the Gd atom in the two different positions of Fe, the magnetic moment is increased to 71.68μ_B and 68.00μ_B, respectively. The magnetic moment increases and remains an integer; hence, SrGdFe₁₁O₁₉-Ⅱ can be very useful for application in magnetic memories. Moreover, applying the Hubbard parameter turns SrGdFe₁₁O₁₉-I and SrGdFe₁₁O₁₉-Ⅱ to magnetic semiconductors with a magnetic moment of 124μ_B, and the energy gap of both doped structures at spin down is found to be less than the pure case. By studying the electronic density diagram of the atoms of the crystal, it is found that the major effect to create magnetization in the pure case is due to the Fe atom. However, in the doped case, the elements Gd and Fe have the highest moment in the crystal respectively.

Keywords: magnetic properties density functional theory half-metal doping

Received: 22 January 2020
Revised: 31 March 2020
Accepted manuscript online:

PACS:	75.75.-c	(Magnetic properties of nanostructures)
	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)
	61.72.-y	(Defects and impurities in crystals; microstructure)

Corresponding Authors: Mohammad Yousefi
E-mail: myousefi50@hotmail.com

Cite this article:

Masomeh Taghipour, Mohammad Yousefi, Reza Fazaeli, Masoud Darvishganji Gd impurity effect on the magnetic and electronic properties of hexagonal Sr ferrites: A case study by DFT 2020 Chin. Phys. B 29 077505

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Gd impurity effect on the magnetic and electronic properties of hexagonal Sr ferrites: A case study by DFT

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