Ferromagnetic and multiferroic interfaces in granular perovskite composite xLa{sub 0.5}Sr{sub 0.5}CoO{sub 3}-(1−x)BiFeO{sub 3}

Journal Article · Sun Aug 21 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4960697· OSTI ID:22598902

Lohr, Javier H.; Saleta, Martín E.; López, Carlos A. ^[1]

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1. INTEQUI, Universidad Nacional de San Luis, CONICET, Área de Química General e Inorgánica “Dr. G.F.Puelles”- Facultad de Química, Bioquímica y Farmacia, Chacabuco y Pedernera, 5700 San Luis (Argentina)

Nanopowder of ferromagnetic La{sub 0.5}Sr{sub 0.5}CoO{sub 3} (LSCO) and multiferroic BiFeO{sub 3} (BFO) were synthesized by spray pyrolysis method. Different compositions of multiferroic xLSCO-(1−x)BFO composites were synthesized at 800 °C for 2 h. Scanning electron microscopy and energy dispersive spectroscopy elemental mapping were performed to study the morphology of composites. Ferri/ferromagnetic responses above T{sub C} (LSCO) are observed, which are associated with the interfaces LSCO/BFO. This interface presents a different behavior compared to the original perovskites, and the magnitude of the magnetization depends on x. Electrical DC conductivity as a function of temperature for LSCO nanopowder (x = 1) presents a different behavior than that reported in bulk material. For x = 1 and 0.9, the model by Glazman and Matveev [Zh. Eksp. Teor. Fiz. 94, 332 (1988)] is proposed to describe the electrical conductivity. On the other hand, x = 0, 0.1, and 0.5 present a variable range hopping behavior. Complex impedance spectroscopy as a function of frequency indicates a pure resistive behavior for x ≥ 0.5 compositions, while a complex resistive-capacitive behavior is observed for low x values (0, 0.1). In these samples, low values of magnetoelectric coupling were measured with an AC lock-in technique.

• OSTI ID: 22598902
• Journal Information: Journal of Applied Physics, Vol. 120, Issue 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COMPARATIVE EVALUATIONS
COUPLING
ELECTRIC CONDUCTIVITY
FERROMAGNETIC MATERIALS
FREQUENCY DEPENDENCE
IMPEDANCE
INTERFACES
MAGNETIC PROPERTIES
MAGNETIZATION
MAPPING
MORPHOLOGY
NANOSTRUCTURES
PEROVSKITE
POWDERS
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
SPECTROSCOPY
TEMPERATURE DEPENDENCE