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.

引用

页数：13

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