Author： Jin C. Wang L. Y. Zheng D. X. Bai H. L.
Publisher： Edp Sciences
E-ISSN： 1286-4854|110|4|47009-47009
ISSN： 0295-5075
Source： EPL (EUROPHYSICS LETTERS), Vol.110, Iss.4, 2015-06, pp. : 47009-47009
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Abstract
Fully epitaxial Fe2.6V0.4O4(FVO)/BiFeO3(BFO) heterostructures were deposited on SrTiO3(001) substrates by magnetron sputtering. The microstructure of the heterostructures was studied using high-resolution transmission electron microscopy (HRTEM). In order to investigate the oxygen-vacancies–influenced interfacial coupling, the FVO layers were deposited on BFO films with various oxygen partial pressures. With the increase of oxygen vacancy contents, the exchange bias effects of the FVO/BFO heterostructures were significantly suppressed, showing weakened interfacial coupling. The possible mechanism is that the oxygen vacancies weaken the interface Fe3+(A)–O2−–Fe3+(BFO) bonds by decreasing the bond angle.
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