マルチフェロイック複合材料のミクロ構造と材料組合せに関するマルチスケール解析

抄録

In this study multiscale finite element simulation was applied to multiferroic composite materials consisting of ferroelectric (FE) and ferromagnetic (FM) phases to design the material combination and the microstructure. An asymptotic homogenization theory was employed for scale bridging to analyze macroscopic homogenized physical properties and microscopic response against external loads. While barium titanate and PZT were picked up for FE phase, cobalt ferrite was selected for FM phase. Three-type microstructures, a random polycrystalline structure, a layered polycrystalline structure, and a layered single-crystal structure were used for computation. Firstly the relation between the content of FE phase and macroscopic homogenized physical properties was investigated for every condition to find the optimum content for maximizing macroscopic magnetoelectric effect. The influence of material combination and microstructure on magnetoelectric (ME) effect was compared. The effective microstructure and its advantage were discussed to emphasize macroscopic ME effect.