Li Songbin, Wang Chuanbin, Shen Qiang, Zhang Lianmeng
State Key Lab of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , P. R. China.
ACS Appl Mater Interfaces. 2019 Aug 21;11(33):30376-30383. doi: 10.1021/acsami.9b05747. Epub 2019 Aug 8.
In this study, artificial multiferroic BaCaZrTiO/LaCaMnO(BCZT/LCMO) epitaxial heterostructures were deposited on Nb-doped SrTiO substrates using pulsed laser deposition. The epitaxial growth of the heterostructures on the substrate was demonstrated by XRD, RSM, and TEM analyses, which displayed decreasing residual strain with increasing BCZT layer thickness. The electrical, magnetic, and magnetoelectric properties of the epitaxial heterostructures were investigated in detail, and they were sensitive to the varying BCZT layer thickness in terms of residual strain. The multiferroic nature of the heterostructures was demonstrated by ferroelectric and ferromagnetic hysteresis loops. Strain-mediated magnetoelectric behavior was observed in the epitaxial heterostructures. Finally, dielectric properties were enhanced in the heterostructures over the BCZT single layer film, and the maximum magnetoelectric coefficient of the heterostructures was 206.5 mV/cm·Oe.
在本研究中，采用脉冲激光沉积法在掺铌的钛酸锶衬底上沉积了人工多铁性BaCaZrTiO/LaCaMnO（BCZT/LCMO）外延异质结构。通过X射线衍射（XRD）、倒易空间映射（RSM）和透射电子显微镜（TEM）分析证明了异质结构在衬底上的外延生长，这些分析表明随着BCZT层厚度的增加，残余应变减小。对外延异质结构的电学、磁学和磁电性能进行了详细研究，它们在残余应变方面对变化的BCZT层厚度敏感。通过铁电和铁磁滞回线证明了异质结构的多铁性本质。在外延异质结构中观察到了应变介导的磁电行为。最后，异质结构的介电性能比BCZT单层膜有所增强，异质结构的最大磁电系数为206.5 mV/cm·Oe。
