Correlation of High Magnetoelectric Coupling with Oxygen Vacancy Superstructure in Epitaxial Multiferroic BaTiO3-BiFeO3 Composite Thin Films

被引:15
作者
Lorenz, Michael [1 ]
Wagner, Gerald [2 ]
Lazenka, Vera [3 ]
Schwinkendorf, Peter [1 ]
Bonholzer, Michael [1 ]
Van Bael, Margriet J. [4 ]
Vantomme, Andre [3 ]
Temst, Kristiaan [3 ]
Oeckler, Oliver [2 ]
Grundmann, Marius [1 ]
机构
[1] Univ Leipzig, Inst Expt Phys 2, D-04103 Leipzig, Germany
[2] Univ Leipzig, Inst Mineral Kristallog & Mat Wissensch, D-04103 Leipzig, Germany
[3] Katholieke Univ Leuven, Inst Kern Stralingsfys, B-3001 Louvain, Belgium
[4] Katholieke Univ Leuven, Lab Vaste Stoffys Magnetisme, B-3001 Louvain, Belgium
来源
MATERIALS | 2016年 / 9卷 / 01期
关键词
oxide thin films; multiferroic composites; magnetoelectric coupling; magnetoelectric voltage coefficient; oxygen vacancy superstructure; pulsed laser deposition; DIFFRACTION;
D O I
10.3390/ma9010044
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Epitaxial multiferroic BaTiO3-BiFeO3 composite thin films exhibit a correlation between the magnetoelectric (ME) voltage coefficient alpha(ME) and the oxygen partial pressure during growth. The ME coefficient alpha(ME) reaches high values up to 43 V/(cm.Oe) at 300 K and at 0.25 mbar oxygen growth pressure. The temperature dependence of alpha(ME) of the composite films is opposite that of recently-reported BaTiO3-BiFeO3 superlattices, indicating that strain-mediated ME coupling alone cannot explain its origin. Probably, charge-mediated ME coupling may play a role in the composite films. Furthermore, the chemically-homogeneous composite films show an oxygen vacancy superstructure, which arises from vacancy ordering on the {111} planes of the pseudocubic BaTiO3-type structure. This work contributes to the understanding of magnetoelectric coupling as a complex and sensitive interplay of chemical, structural and geometrical issues of the BaTiO3-BiFeO3 composWite system and, thus, paves the way to practical exploitation of magnetoelectric composites.
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页数:13
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