有序多层异质外延 BaTiO₃/CoFe₂O₄ 纳米点中的磁电耦合。

Magnetoelectric coupling in ordered arrays of multilayered heteroepitaxial BaTiO₃/CoFe₂O₄ nanodots.

机构信息

Max Planck Institute of Microstructure Physics, D-06120 Halle (Saale), Germany.

出版信息

Nano Lett. 2011 Aug 10;11(8):3202-6. doi: 10.1021/nl201443h. Epub 2011 Jul 15.

DOI:10.1021/nl201443h

Abstract

Fully epitaxial BaTiO(3)/CoFe(2)O(4) ferroelectric/ferromagnetic multilayered nanodot arrays, a new type of magnetoelectric (ME) nanocomposite with both horizontal and vertical orderings, were fabricated via a stencil-derived direct epitaxy technique. By reducing the clamping effect, ferroelectric domain modification and distinct magnetization change proportional to different interfacial area around the BaTiO(3) phase transition temperatures were found, which may pave the way to quantitative introducing of ME coupling at nanoscale and build high density multistate memory devices.

摘要

全外延 BaTiO(3)/CoFe(2)O(4)铁电/铁磁多层纳米点阵列，一种具有水平和垂直有序的新型磁电（ME）纳米复合材料，通过模板衍生的直接外延技术制备而成。通过减小夹持效应，发现铁电畴的修改和与 BaTiO(3)相变温度周围不同的界面面积成比例的明显磁化变化，这可能为在纳米尺度上定量引入 ME 耦合铺平道路，并构建高密度多态存储器件。