Effect of interface coupling between polarization and magnetization in La0.7Pb0.3MnO3 (LPMO)/P(VDF-TrFE) flexible nanocomposite films

• Published in: Journal of materials science 2022-04, Vol.57 (15), p.7621-7641
• Main Authors: Koner, Sougata, Deshmukh, Pratik, Ahlawat, Anju, Singh, Rashmi, Majumder, S. K., Satapathy, S.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Coupling coefficients; Crystallography and Scattering Methods; Curie temperature; Current carriers; Electronic Materials; Ferroelectric materials; Ferroelectricity; Ferromagnetism; Leakage current; Magnetization; Materials Science; Nanocomposites; Nanoparticles; Polarization; Polymer Sciences; Sol-gel processes; Solid Mechanics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-022-07100-3

La 0.7 Pb 0.3 MnO 3 (LPMO) nanoparticles (NPs) were prepared by sol–gel auto-combustion method. These were embedded in P(VDF-TrFE) to form (0–3) nanocomposite (NC) films by solution casting method for 0.2, 0.5, 1, 2 and 5 vol.% of LPMO. Phase and morphology studies on LPMO NPs reveal R-3c structure and mean particle size of (61.03 ± 17.41) nm, respectively. The XRD and SEM studies on LPMO/P(VDF-TrFE) nanocomposite films confirm the presence of constitutive phases and dispersion of LPMO particle in P(VDF-TrFE) matrix. There is increase in permittivity of NC films (above 1 vol.% of LPMO) in low frequency region (< 1 kHz) due to MWS effect. The observation of low DC leakage current density (~ 10 −6 A/mm 2 ) at application of high field and low tangent loss (< 0.01) for NC films signifies presence of very small free charge carriers in NC films. Proper ferroelectric loop is obtained for NC film up to 2 vol.% of LPMO in polymer matrix. Magnetization ( M ) measurements of LPMO NPs confirm the ferromagnetic nature and the existence of Curie temperature at ~ 357 K of these NPs. M - H characteristics for NC films demonstrate the increase in magnetization of NC films with increase in volume percentage of NPs. The interface coupling between ferroelectric polarization and magnetization in NC films was verified by measuring magnetoelectric (ME) coupling coefficient of these NC films. A maximum ME coupling coefficient ( α 31 V ) of 170.15 mV/Oe-cm is observed for NC films having 0.2 LPMO vol.% with a self-bias voltage of 12.68 mV. A negative MD effect is observed in NC films, and a maximum magneto-dielectric coupling (MDC%) of − 6.4 at 0.7 T is also witnessed for NC films having 5 LPMO vol.%. Graphical abstract Interface coupled phenomenon by polarization and magnetization in LPMO/P(VDF-TrFE) thick film results in excellent magnetoelectric (ME) and magneto-dielectric (MD) coefficients.