LAUSR

Abstract The local structure of SrFe12O19 nanoparticles was investigated by a combined synchrotron pair distribution function (PDF), Raman and 57Fe-Mossbauer spectroscopic analysis. The PDF and 57Fe-Mossbauer spectroscopy results indicate that SrFe12O19 nanoparticles exist in an M-type hexagonal phase (∼10 nm), with a dynamically disordered trigonal bipyramidal Fe(2) site (2b). We determine that at 300 K, the timescale dynamics of Fe3+ ions near the 2b positions are between 10−15 and 10− s. The Raman spectra show anomalous shifts in all active phonon wavenumbers above TN ≈ 720 K, indicating the presence of spin-phonon coupling. The Fe3+(2b) dynamic regime motion was interpreted by taking into account changes in the electric polarization at T = TN, which discontinuously drops to zero at this temperature.