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Integration of sputter-deposited multiferroic CoFeO-BiFeO nanocomposites on conductive LaSrMnO electrodes. | LitMetric
The structure, magnetic and ferroelectric properties of sputtered epitaxial CoFeO-BiFeO (CFO-BFO) nanocomposite thin films grown on LaSrMnO (LSMO) layers on (001) oriented SrTiO (STO) substrates and on STO-buffered Si are described. The as-grown LSMO thin films were smooth and poorly conductive but the resistivity was reduced and the surfaces roughened after annealing. Cosputtered CFO and BFO on STO formed vertically aligned nanostructures consisting of epitaxial spinel CFO pillars within a perovskite BFO matrix, but the rough surface of the annealed LSMO film promoted additional CFO pillar orientations. A reorientation of the CFO magnetic easy axis to an in-plane direction occurred as the LSMO became thicker due to changes in the strain state of the CFO pillars. The LSMO underlayer enabled the ferroelectric response of the BFO to be measured. Nanocomposites were grown onto LSMO/SrTiO/Si which provides a path towards large scale integration of electrically contacted nanocomposites on Si.
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