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Chin. Phys. B, 2020, Vol. 29(7): 077505    DOI: 10.1088/1674-1056/ab8d9f
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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

Masomeh Taghipour1, Mohammad Yousefi2, Reza Fazaeli3, Masoud Darvishganji4
1 Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, Iran;
2 Department of Chemistry, Yadegar-e-Imam Khomeni(RAH) shahr-e-Rey Branch, Islamic Azad University, Tehran, Iran;
3 Department of Chemistry, South Tehran Branch, Islamic Azad University, Tehran, Iran;
4 Department of Chemistry, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran
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 64.00μB, while using the GGA+U functional, the magnetic intensity increases, resulting in a magnetic semiconductor with a high integer magnetic moment of 120μB. By doping the Gd atom in the two different positions of Fe, the magnetic moment is increased to 71.68μB and 68.00μB, 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 124μB, 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      Published:  05 July 2020
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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