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    题名: Thickness Effect of Interlayer on the Dielectric Permittivity of BaTiO /Co/BaTiO and BaTiO /Ta/BaTiO Films
    作者: 李尚凡
    Ding,Y.;Yao, Y.D.;Wu, K.T.;Chen, P.S.;Tu, C.S.;Hsu, J.C.;Hung, D.S.;Lee, S.F.
    贡献者: 應物所
    关键词: Barium titanate (BTO);cobalt (Co);dielectric constant;magneto dielectric;tantalum (Ta)
    日期: 2012-10
    上传时间: 2014-10-09 15:50:36 (UTC+8)
    摘要: Co and Ta inserted layers with thickness x varied from 0 to 20 nm on the dielectric permittivity of BaTiO3 (60 nm)/Co(x nm)/BaTiO3 (60 nm) (BCB) and BaTiO3 (60 nm)/Ta(x nm)/BaTiO3 (60 nm) (BTB) films fabricated on glass B270 substrates by the reactive sputtering technique was studied. The dielectric constant is around 7.6 for B270 glass substrate and BaTiO3 /B270 film. However, it is rapidly raised up to roughly 84.3-89.4 for BCB, and 75.5-88.2 for BTB samples with the thickness of the Co or Ta inserted layer larger than 2 nm. This large enhancement of the dielectric constant could be explained due to the growth mechanism of the metallic inserted layer from island clusters to continuous layer for samples with x roughly near 3 nm, and the conducting property of the metallic inserted layer. The adding of a Co or Ta interlayer redistributes the interface charges between metal and ferroelectric layers, and that enhances both the intrinsic polarization and its dielectric constant. For the magnetic induced dielectric variation, after comparing the variation of the dielectric properties of both Co and Ta inter layers, the magneto dielectric properties in BaTiO3 /Co/BaTiO3 films are manifested. This magnetic tunability of the dielectric constant is clearly attributed to the magnetic metallic Co layer in the films. From this study, the magneto dielectric properties are manifested in BTO/Co/BTO films and it has the potential for a ferroic sensor application.
    關聯: IEEE Trans. Magn.,48(11),4297-4300
    数据类型: article
    DOI 連結: http://dx.doi.org/10.1109/TMAG.2012.2198053
    DOI: 10.1109/TMAG.2012.2198053
    显示于类别:[應用物理研究所 ] 期刊論文

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