Magnetic effects on dielectric and polarization behavior of multiferroic heterostructures

Abstract

PbZr 0.52 Ti 0.48 O 3 /La 0.67 Sr 0.33 MnO 3 (PZT/LSMO) bilayer with surface roughness ~ 1.8 nm thin films have been grown by pulsed laser deposition on LaAlO 3 (LAO) substrates. High remnant polarization (30-54μC/cm 2 ), dielectric constant(400-1700), and well saturated magnetization were observed depending upon the deposition temperature of the ferromagnetic layer and applied frequencies. Giant frequency-dependent change in dielectric constant and loss were observed above the ferromagnetic-paramagnetic temperature. The frequency dependent dielectric anomalies are attributed to the change in metallic and magnetic nature of LSMO and also the interfacial effect across the bilayer; an enhanced magnetoelectric interaction may be due to the Parish-Littlewood mechanism of inhomogeneity near the metal-dielectric interface.

Effect of thickness on dielectric, ferroelectric, and optical properties of Ni substituted Pb(Zr0.2Ti0.8)O3 thin films

“…The e r increases gradually, exhibiting one sharp and a second broad peak around 430 K and 570-630 K, respectively. We attribute the sharp shoulder around 430 K to the ferromagneticparamagnetic phase transition of LSMO; a similar anomaly was observed by Dussan et al 30 at around 400 K for PZT/ LSMO heterostructures. This transition is almost frequencyindependent.…”

“…At high-frequency low dielectric constant and high loss may be due to semiconducting nature of the bottom electrode and its response to the probe frequency. 30 An improvement in dielectric constant was observed for Ni-substituted PZT thin films compared to pure PZT. 31,32 The observed enhancement in dielectric constant may be due to the existence of large grains seen in surface morphology (micrograph shown in Fig.…”

Simultaneous enhancements of polarization and magnetization in epitaxialPb(Zr0.52Ti0.48)O3/Mukherjee1, Hordagoda2, Lampen3 et al. 2015Phys. Rev. B29390View full textAdd to dashboardCite

“…An alternative layered multiferroic system consists of PZT with the FM half-metallic manganite La x Sr 1−x MnO 3 (LSMO) [14,15]. The demonstration of a charge-mediated ME effect in PZT/LSMO heterostructures has revived interest in these systems for novel spintronic applications [16,17].…”

Room temperature multiferroic effects in superlattice nanocapacitors

“…15 Further, its lattice parameter ͑3.87 Å͒ matches closely to that of perovskite ferroelectric material. Our previous work 16 has demonstrated dynamic magnetodielectric interaction in bilayered PZT/LSMO thin films that was attributed to Parish-Littlewood mechanism of inhomogeneity near the metal-dielectric interface. In addition, multiferroic properties have been reported in epitaxial La 0.7 Sr 0.3 MnO 3 / PbZr x Ti 1−x O 3 heterostructures which makes this system worthy of further investigation.…”

“…The detailed deposition parameters and electrical characterization are discussed elsewhere. 16 Scanning probe microscopy ͑Veeco-AFM contact mode͒ was used to examine the surface topography, piezo force microscopy ͑PFM͒ surface roughness, and local ferroelectric switching behavior. Magnetic hysteresis, Zero-field cooled ͑ZFC͒ and field cooled ͑FC͒ magnetization were measured by using a Quantum Design MPMS XL-7 superconducting quantum interference device magnetometer ͑SQUID͒.…”