CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electric and Magnetic Properties and Magnetoelectric Effect of the Ba0.8Sr0.2TiO3/CoFe2O4 Heterostructure Film by Radio-Frequency Magnetron Sputtering |
WANG Ye-An, WANG Yun-Bo**, RAO Wei, GAO Jun-Xiong, ZHOU Wen-Li, YU Jun |
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074
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Cite this article: |
WANG Ye-An, WANG Yun-Bo, RAO Wei et al 2013 Chin. Phys. Lett. 30 047502 |
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Abstract A Ba0.8Sr0.2TiO3/CoFe2O4 layered heterostructure film was grown on a Pt/TiO2/SiO2/Si substrate by rf-magnetron sputtering. X-ray diffraction shows that the film consists of perovskite Ba0.8Sr0.2TiO3 and spinel CoFe2O4 phases. The microstructures of the film were observed by a scanning electron microscope (SEM), showing good surface morphology and clear interfaces among the Ba0.8Sr0.2TiO3 film, the CoFe2O4 film and the substrate. The variations of dielectric properties with frequency of the heterostructure film are investigated. The heterostructure film simultaneously displays distinct ferroelectricity and ferromagnetism. Moreover, an obvious magnetoelectric coupling effect was observed in the heterostructure film with a maximum magnetoelectric voltage coefficient of 5.0 mV?cm?1Oe?1, which is about seven times larger than that of the Ba0.8Sr0.2TiO3/CoFe2O4 particulate composite ceramics in a previous report.
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Received: 11 October 2012
Published: 28 April 2013
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PACS: |
75.85.+t
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(Magnetoelectric effects, multiferroics)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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75.60.-d
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(Domain effects, magnetization curves, and hysteresis)
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77.84.-s
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(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
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