Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 8, Pages 4521-4525Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.11.064
Keywords
Sol-gel; Thin films; Dielectric properties; Ferroelectric; Ferromagnetism
Categories
Funding
- Ministry of Sciences and Technology of China [2009CB623302]
- Doctoral Program of Higher Education [SRFDP20060247003]
- Shanghai Committee of Science and Technology [07DZ22302]
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Ba0.70Sr0.30TiO3 (BST) thin films doped by Co (BSTC) are fabricated by sol-gel method on a Pt/Ti/SiO2/Si substrate. A strong correlation is observed among the microstructure, dielectric, ferroelectric, ferromagnetic properties and Co concentration. The dielectric constant of BST thin films can be tailored from 343 to 119 by manipulating the Co concentration. The dielectric loss of BSTC thin films are still kept below 0.020 and the tunability is above 30% at a dc-applied electric field of 500 kV/cm. With increasing Co doping up to 10 mol%, the coexistence of ferromagnetism and ferroelectrics is found. Suitable dielectric constant, low-dielectric loss, and high tunability of this kind of thin films can be useful for potential tunable applications. (C) 2008 Elsevier B. V. All rights reserved.
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