Conductance control at the LaAlO{sub 3}/SrTiO{sub 3}-interface by a multiferroic BiFeO{sub 3} ad-layer

Journal Article · Mon Jun 30 04:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4886405· OSTI ID:22303899

Mix, Christian; Finizio, Simone; Kläui, Mathias; Jakob, Gerhard ^[1]

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1. Institut für Physik, Johannes Gutenberg Universität Mainz, Staudingerweg 7, D-55128 Mainz (Germany)

Multilayered BiFeO{sub 3} (BFO)/LaAlO{sub 3} (LAO) thin film samples were fabricated on SrTiO{sub 3} (STO) substrates by pulsed laser deposition. In this work, the ferroelectric polarization of a multiferroic BFO ad-layer on top of the quasi-two-dimensional electron gas (2DEG) at the LAO/STO interface is used to manipulate the conductivity of the quasi-2DEG. By microstructuring the conductive area of the LAO/STO-interface, a four-point geometry for the measurement of the resistivity was achieved. Piezo force microscopy allows for imaging and poling the spontaneous ferroelectric polarization of the multiferroic layer. The resistance changes showed a linear dependence on the area scanned and a hysteretic behavior with respect to the voltages applied in the scanning process. This is evidence for the ferroelectric polarization of the multiferroic causing the resistance changes. Coupling the antiferromagnetic BFO layer to another ferromagnetic layer could enable a magnetic field control of the conductance of the quasi-2DEG at the LAO/STO interface.

• OSTI ID: 22303899
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 26 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINATES
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRON GAS
ENERGY BEAM DEPOSITION
FERRITES
FERROELECTRIC MATERIALS
INTERFACES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LASER RADIATION
LAYERS
MAGNETIC FIELDS
MICROSTRUCTURE
POLARIZATION
PULSED IRRADIATION
STRONTIUM TITANATES
SUBSTRATES
THIN FILMS