@article{SisLab4499,
          volume = {867},
          number = {158794},
           month = {January},
          author = {Duc Thang Pham and Dang Co Nguyen and Thi Minh Hong Nguyen and Thi Anh Ho},
           title = {Electronic structure and multiferroic properties of (Y, Mn)-doped barium hexaferrite compounds},
       publisher = {Elsevier B.V},
            year = {2021},
         journal = {Journal of Alloys and Compounds},
             doi = {10.1016/j.jallcom.2021.158794},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/4499/},
        abstract = {We have systematically studied the crystal and electronic structures and the magnetic and electrical polarization properties of polycrystalline Ba0.95Y0.05Fe12?xMnxO19 (denoted as BaYFe12?xMnxO19) compounds with x = 0?2. The analyzes of X-ray diffraction patterns and Raman scattering spectra indicated their single phase in the M-type hexaferrite structure. With increasing x, the lattice constant a slightly increased while c decreased, which related to the Jahn-Teller effect. Though an increase of x reduced gradually magnetization in a range of 23?32 emu/g, the coercive force increased from 3.3 kOe for x = 0 to about 4 kOe for x = 0.5?2. The study of the electrical polarization properties proved the dependence of the shape of electric hysteresis loops on x and applied electric field. The samples with x = 0 and 0.5 exhibit a weak ferroelectricity with the maximum polarization of {\texttt{\char126}}0.11 {\ensuremath{\mu}}C/cm2 for x = 0, and of {\texttt{\char126}}0.06 {\ensuremath{\mu}}C/cm2 for x = 0.5. Meanwhile, the other samples showed nearly circular hysteresis loops, which are characteristic of conductive materials. Detailed investigations indicated an increase in leakage current when x increased. All of such phenomena are tightly related to the chemical shift of Mn2+ {$\rightarrow$} Mn3+ and the replacement of Mn2+,3+ for Fe3+ in BaYFe12?xMnxO19. These oxidation states and the chemical shift of Mn have been confirmed upon analyzing X-ray absorption spectra}
}