Magnetic Effects on the Dielectric and Polarization Properties in BiAlO3 /La0.67 Sr0.33 MnO3 Heterostructure

Abstract

BiAlO3/La0.67Sr0.33MnO3 heterostructure was fabricated on LaAlO3 (111) substrate by pulsed laser deposition technology. A remarkable magneto-resistivity effect was detected at H = 1 T near the metal–insulator phase transition temperature (TMI) of La0.67Sr0.33MnO3. The magneto-dielectric constant shows an anomaly near TMI of La0.67Sr0.33MnO3, whereas the ferroelectric polarization increases under magnetic field and its variation shows the similar anomaly near TMI of La0.67Sr0.33MnO3, which could be assigned to the important role of the phase transformation of La0.67Sr0.33MnO3. The magnetic moment of the BiAlO3/La0.67Sr0.33MnO3 heterostructure distinctly arises compared to the single La0.67Sr0.33MnO3 layer, probably on account of the spin–orbit coupling effect at the interface, and the relative magnetization variation also shows an anomaly near TMI of La0.67Sr0.33MnO3.