由铁氧体(如： CoFe2O4, NiFe2O4)和铁电相(如： BaTiO3, Pb(ZrxTi1-x)O3)组成的复合材料是经典的复合磁电材料,也是最早在室温下观察到大磁电耦合效应的复合材料。这类复合材料的制备通常是在高于1200℃的高温条件下将铁氧体相和铁电相两相共烧而成。然而,在高温过程中不可避免的存在原子互扩散及两相界面反应,甚至出现微裂纹。本文综合介绍了几种通过直接在一种铁性氧化物块体上生长另一种铁性陶瓷膜的方法,从而实现铁电、铁磁两相之间的低温复合(一般不高于800℃),避免了高温共烧过程中的固有问题,并展示了此类膜/块体复合体系的磁电耦合性能常用的表征方法。
Composite ceramics of ferrites (e.g., CoFe2O4, NiFe2O4) and ferroelectrics (e.g., BaTiO3, Pb(ZrxTi1-x)O3) are classical magnetoelectric (ME) materials, which are also the first composites found to exhibit large room-temperature ME effect. These composites are generally fabricated via sintering at high temperature of over 1200℃. However, such high-temperature co-firing processing yields atom inter-diffusion and/or chemical reactions between two phases, or even microcracks. In this review, several low-temperature (normally below 800℃) synthesis routes of depositing the ferromagnetic (ferroelectric) films on ferroelectric (ferromagnetic) bulk single-crystals or ceramics are summarized. By such means, the above-mentioned problems can be avoided to improve the ME effect across the interface. Methods frequently used for characterizing the ME effect in these ceramics-based composites films are also discussed.
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