The integration of ferroelectric and ferromagnetic promises an essential strategy of obtaining high performance electronic devices. In this work, we demonstrate in situ observation of electric field induced magnetic domain structure evolution for 0.5Ba(Ti0.8Zr0.2)O3–0.5(Ba0.7Ca0.3)TiO3–CoFe2O4 (BZT–0.5BCT/CFO) films, which manifests the magnetoelectric (ME) coupling between ferroelectric BZT–0.5BCT and ferrimagnetic CFO. The multiferroic behaviors of BZT–0.5BCT/CFO bilayers thin films were characterized by measuring ferroelectric domains, ferroelectric and ferrimagnetic hysteresis loops. The magnetic domain structure were investigated as functions of electric field, when the sample is applied with a voltage of 3 V, approximately 49.2% of the magnetization domain was varied in CFO thin films. The modulation of the domain structure could be attributed to the strain-induced mechanical transduction between the ferroelectric and magnetic films and modulation of the electron density of the CFO films. Direct observation of electric field induced magnetic domain evolution is significant since it gives a direct evidence of magnetoelectric coupling effect.

中文翻译：

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(Ba,Ca)(Ti,Zr)O3–CoFe2O4 多铁性薄膜中电场诱导磁畴演化的原位观察

铁电和铁磁的集成有望成为获得高性能电子设备的重要策略。在这项工作中，我们展示了 0.5Ba(Ti0.8Zr0.2)O3–0.5(Ba0.7Ca0.3)TiO3–CoFe2O4 (BZT–0.5BCT/CFO) 薄膜的电场诱导磁畴结构演变的原位观察，这表明铁电 BZT–0.5BCT 和亚铁磁 CFO 之间的磁电 (ME) 耦合。BZT-0.5BCT/CFO 双层薄膜的多铁性行为通过测量铁电畴、铁电和亚铁磁滞回线来表征。研究了作为电场函数的磁畴结构，当样品施加 3 V 的电压时，CFO 薄膜中大约 49.2% 的磁畴发生变化。畴结构的调制可归因于铁电膜和磁性膜之间的应变诱导的机械转换以及CFO膜的电子密度的调制。直接观察电场引起的磁畴演化具有重要意义，因为它提供了磁电耦合效应的直接证据。