Multiferroic double-perovskite Bi2FeMnO6 hollow particles

Double perovskite structured multiferroic Bi2FeMnO6 hollow particles have been fabricated on silicon substrates from a sol-gel precursor by an electrospray method. The as-prepared Bi2FeMnO6 polycrystalline samples are pure-phase, crystallizing in space group R3c. Raman spectra have verified the vibrational frequencies in the Bi2FeMnO6 samples. The Bi2FeMnO6 nano-/micron-sized hollow particles show a porous shell with large interior void. The shell thickness is ∼100 nm. The structure and morphology of the sample were found to be controlled by the deposition time. The formation mechanism can be explained by an Ostwald ripening − Kirkendall model. The temperature dependence of the magnetization curve (M-T) and magnetic hysteresis loops indicate that Bi2FeMnO6 particles exhibit weak ferromagnetic moment at both low and room temperature.