Magnetoelectric coupling tailored by the orientation of the nanocrystals in only one component in percolative multiferroic composites.
Magnetoelectric coupling tailored by the orientation of the nanocrystals in only one component in percolative multiferroic composites.
复制标题
通过渗透多铁复合材料中仅一个组件中的纳米晶体的取向来定制磁电耦合
作者：
采用简单的0-3复合工艺制备了1-3型多铁性复合薄膜。采用磁控溅射法对BaTiO 3-Ni0.5Zn0.5Fe2O4（BTO-NZFO）复合薄膜中Ni0.5Zn0.5Fe2O4（NZFO）纳米晶的取向进行了控制，并研究了其对磁电耦合的控制作用。BTO-NZFO复合薄膜中的NZFO晶格在Si（111）面的诱导下沿（100）取向生长。紧密接触的晶粒之间的衬底应力的转移也有助于NZFO纳米晶体的取向。0.6BTO-0.4（100）NZFO多铁性复合薄膜在BTO相的居里点处表现出9.2%的磁化强度，显示出极强的磁电耦合特性。该工作为高性能多铁性复合材料的开发提供了有效的策略，并从物理化学的角度提出了实现强磁电耦合效应的新构想。通过对铁氧体纳米晶取向的调控，实现了BaTiO 3-Ni0.5Zn0.5Fe2O4多铁性复合薄膜的强磁电耦合。
Novel 1–3 type multiferroic composite thin films were prepared via a simple 0–3 composite fabrication process. The orientation of the Ni0.5Zn0.5Fe2O4 (NZFO) nanocrystals in the BaTiO3–Ni0.5Zn0.5Fe2O4 (BTO–NZFO) composite thin films was controlled by magnetron sputtering, and the controlling effect of such orientation on magnetoelectric coupling was investigated in detail. The NZFO lattice in the BTO–NZFO composite thin films grew with (100) orientation under the induction of the (111) plane of Si. The transfer of substrate stress between the closely contacted grains also contributes to the orientation of the NZFO nanocrystals. The 0.6BTO–0.4(100)NZFO multiferroic composite thin film exhibited a magnetization strength of 9.2% at the Curie point of the BTO phase, showing extremely strong magnetoelectric coupling characteristics. This work provides an effective strategy for the development of high-performance multiferroic composites, and brings about new conception of realizing strong magnetoelectric coupling effect from the perspective of physical chemistry. Strong magnetoelectric coupling is realized in BaTiO3–Ni0.5Zn0.5Fe2O4 multiferroic composite thin films by tailoring the orientation of ferrite nanocrystals.
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