Abstract Using chemical solution deposition method, La 0.67 Sr 0.33 MnO 3 (LSMO) and Bi 3.15 Nd 0.85 Ti 2.95 Hf 0.05 O 12 (BNTH) layers were successively fabricated onto (001) LaAlO 3 (LAO) substrates, and then BNTH/LSMO ferromagnetic-ferroelectric composite films with a 2-2 layered type structure were obtained. The LSMO ferromagnetic layer was epitaxially grown on the LAO substrate and showed the low resistivity of 5.0 × 10 −3 Ω cm. It was not only used as a seed layer to induce the oriented growth of BNTH ferroelectric layers, but also as a bottom electrode to measure ferroelectric/magnetoelectric (ME) properties. The effects of crystallization temperature on the orientation degree, the surface morphology, and the dielectric and ferroelectric performances of the composite films were investigated. The composite film crystallized at 730 °C has the largest remnant polarization (Pr) of 35.0 μC/cm 2 , the lowest leakage current density of 1.35 × 10 −7 A/cm 2 and the high saturated magnetization (Ms) of 370 emu/cm 3 . The composite film also exhibits a strong ME response in the absence of DC bias magnetic field. Its ME voltage coefficient, α E , gradually increases from zero with the increasing of the AC magnetic field frequency, and eventually reaches 35.8 V/cm·Oe at 100 kHz.

中文翻译：

---

中等结晶温度下化学溶液沉积强磁电效应Bi 3.15 Nd 0.85 Ti 2.95 Hf 0.05 O 12 /La 0.67 Sr 0.33 MnO 3 复合薄膜的生长及表征

摘要 采用化学溶液沉积法，在 (001) LaAlO 3 (LAO) 衬底上依次制备 La 0.67 Sr 0.33 MnO 3 (LSMO) 和 Bi 3.15 Nd 0.85 Ti 2.95 Hf 0.05 O 12 (BNTH) 层，然后 BNTH/LSMO获得了具有2-2层结构的铁磁-铁电复合薄膜。LSMO 铁磁层在 LAO 衬底上外延生长并显示出 5.0 × 10 -3 Ω cm 的低电阻率。它不仅用作种子层以诱导 BNTH 铁电层的定向生长，还用作底部电极以测量铁电/磁电 (ME) 特性。研究了结晶温度对复合薄膜的取向度、表面形貌、介电和铁电性能的影响。在 730 °C 结晶的复合膜具有最大的残余极化 (Pr) 35.0 μC/cm 2 ，最低漏电流密度 1.35 × 10 -7 A/cm 2 和高饱和磁化强度 (Ms) 370 emu/厘米 3 . 在没有直流偏置磁场的情况下，复合膜也表现出强烈的 ME 响应。其ME电压系数α E 随着交流磁场频率的增加而从零开始逐渐增加，最终在100 kHz时达到35.8 V/cm·Oe。