The effective medium approximation for annealed magnetoelectric polycrystals
The effective medium approximation for annealed magnetoelectric polycrystals
复制标题
退火磁电多晶的有效介质近似
DOI：
10.1063/1.2836976
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发表时间：
2008-01
影响因子：
3.2
通讯作者：
中科院分区：
文献类型：
--
作者：
磁电多晶体通常具有反铁磁畴和相反的磁电系数，必须在适当的电场和磁场下退火，使多晶体宏观磁电。本文采用有效介质近似方法计算了磁电多晶在Neel温度下退火后的宏观系数，研究了温度、晶粒形状和取向分布对Cr_2O_3多晶宏观磁电系数的影响。结果表明，多晶的有效磁电系数高于单晶a11，但低于单晶a33，用有效介质近似法计算的有效磁电系数高于简单的体积平均法，且与实验数据吻合较好.随机取向的多晶组织最适合于a11取向，而纤维织构的多晶组织最适合于a11取向。
Magnetoelectric polycrystals usually possess antiferromagnetic domains with oppositive magnetoelectric coefficients, and have to be annealed under the appropriate electric and magnetic fields to make the polycrystals macroscopically magnetoelectric. In this paper, we developed an effective medium approximation to calculate the macroscopic coefficients of magnetoelectric polycrystals annealed through Neel’s temperature, and studied the effects of temperature as well as shape and orientation distribution of grains on the macroscopic magnetoelectric coefficients of polycrystalline Cr2O3. It is observed that the effective magnetoelectric coefficient of polycrystal is higher than single-crystalline a11 but lower than single-crystalline a33, and that calculated from the effective medium approximation is higher than simple volume averaging and agrees with experimental data better. It is also noted that polycrystals with randomly oriented grains are optimal for a11∗, while those with fiber texture are optimal for...
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影响因子：
9.4
作者：
Shashidhar Srinivas;Jiangyu Li
通讯作者：
Shashidhar Srinivas;Jiangyu Li
影响因子：
64.8
作者：
Fiebig, M;Lottermoser, T;Pisarev, RV
通讯作者：
Pisarev, RV
影响因子：
3.2
作者：
Dong, SX;Zhai, JY;Lograsso, TA
通讯作者：
Lograsso, TA
影响因子：
3.9
作者：
Jiangyu Li
通讯作者：
Jiangyu Li
影响因子：
3.7
作者：
L. Li;Jiangyu Li
通讯作者：
L. Li;Jiangyu Li