Effect of Nano-Size on Magnetostriction of BiFeO3 and Exceptional Magnetoelectric Coupling Properties of BiFeO3_P(VDF-TrFE) Polymer Composite Films for Magnetic Field Sensor Application

The existence of magnetostriction in bulk BiFeO 3 is still a matter of investigation and it is also an issue to investigate the magnetostriction effect in nano BiFeO 3 . Present work demonstrates the existence of magnetostrictive strain in superparamagnetic (SPM) BiFeO 3 nanoparticles at room temperature and the magnetoelectric (ME) coupling properties in composite form with P(VDF-TrFE). Despite few reports on the magnetostriction effect in bulk BiFeO 3 evidenced by the indirect method, the direct method (strain gauge) was employed in this work to examine the magnetostriction of SPM BiFeO 3 . In addition, a high ME coupling coefficient was observed by the lock-in technique for optimized BiFeO 3 _P(VDF-TrFE) nanocomposite film. These nanocomposite films also exhibit room-temperature multiferroic properties. These results provide aspects of material with immense potential for practical applications in spintronics and magneto-electronics applications. We report a ME sensor using SPM BiFeO 3 _P(VDF-TrFE) nanocomposite film for detection of ac magnetic field.