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Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe 12 O 19 Nanoparticles
Author(s) -
Apostolova Ilia.,
Apostolov Angel T.,
Trimper Steffen,
Wesselinowa Julia M.
Publication year - 2021
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202100069
Subject(s) - materials science , doping , coercivity , dielectric , nanoparticle , multiferroics , magnetization , condensed matter physics , analytical chemistry (journal) , nanotechnology , magnetic field , ferroelectricity , chemistry , physics , optoelectronics , chromatography , quantum mechanics
Different properties of pure and Ni, Zr, and Sm‐doped BaFe 12 O 19 —bulk and nanoparticles—are investigated using a microscopic model and the Green's function technique. The magnetizationM sincreases whereas the coercive fieldH cdecreases with increasing particle size. The doping leads to a decrease of M s and the bandgap energy E g with increasing Zr concentration x due to tensile strain and to an increase of M s and E g after Ni doping due to compressive strain as well as due to size effects. The behavior of the spontaneous polarization P s and the real part ϵ′ of the dielectric constant is opposite. The ϵ′ of a pureBaFe 12 O 19nanoparticle decreases with increasing magnetic field h . The effects of Sm substitution at Ba or Fe sites on ϵ′ and M s are also studied.