New multiferroics BiFe1−2xAlxMnxO3 nanoparticles: Synthesis and evaluation of various structural, physical, electrical, dielectric and magnetic parameters

• New nanostructured derivatives of BiFeO3 were prepared by cheap method.
• The rhombohedral structures of BiFe1−2xAlxMnxO3 were established.
• The electrical resistivity was increased from 8 × 108 to 48 × 108 ohm cm.
• The magnetic properties of the materials also enhanced by the substituents.

Nanostructures multiferroic BiFeO3 and its derivatives BiFe1−2xAlxMnxO3 are synthesized by a simple co-precipitation route. FTIR and XRD data confirms the rhombohedral structure and crystallite size is found in the range of 30–50 nm. The surface morphology change from round shaped particles to sheets form. The electrical resistivity is increased while the dielectric parameters decreased with the substituents. The BiFeO3 shows week ferromagnetic behavior and have high coercivity (Hc = 2590.3 G). The coercivity decreased from 2.59 × 103 to 0. 211 × 103 G with the increase in Al–Mn contents, while the saturation magnetization is found to increase from 0.030 to 0.056 emu g−1 up to x = 0.3 and then decreased. The measured electrical, dielectric and magnetic parameters suggest that these materials can be utilized for fabricating the nano-devices working at very high frequencies as well as in data storage electronics devices.

Nanostructures multiferroic BiFeO3 and its derivatives BiFe1−2xAlxMnxO3 in the range of 30–50 nm were fabricated by wet chemical route exhibited very high coercivity values and relatively small values of saturation magnetization and retentivity.Figure optionsDownload as PowerPoint slide