尖晶石氧化物CoCr2O4的多铁性研究

doi:10.19596/j.cnki.1001-246x.7675

计算物理 ›› 2018, Vol. 35 ›› Issue (4): 494-504.DOI: 10.19596/j.cnki.1001-246x.7675

• • 上一篇

尖晶石氧化物CoCr₂O₄的多铁性研究

刘佳宏¹, 杜安², 齐岩¹

1. 大连民族大学物理与材料工程学院, 大连 116600;
2. 东北大学理学院, 沈阳 110819

收稿日期:2017-04-17 修回日期:2017-08-15 出版日期:2018-07-25 发布日期:2018-07-25
通讯作者: 齐岩,E-mail:qiyan@dlnu.edu.cn
作者简介:刘佳宏(1968-),男,博士,讲师,研究方向:磁性材料理论计算研究,E-mail:jiahongl@dlnu.edu.cn
基金资助:
国家自然科学基金（11547236）、辽宁省教育厅一般项目（L2015130）和大连民族大学自主基金（DC201501065）资助项目

Investigation on Multiferroicity in Spinel Oxide CoCr₂O₄

LIU Jiahong¹, DU An², QI Yan¹

1. School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China;
2. College of Sciences, Northeastern University, Shenyang 110819, China

Received:2017-04-17 Revised:2017-08-15 Online:2018-07-25 Published:2018-07-25

摘要/Abstract

摘要： 为深入理解化合物CoCr₂O₄奇特的多铁性行为，结合尖晶石晶格结构特点，考虑近邻A-A、A-B、B-B及B位离子间次近邻交换耦合的影响，构建经典海森堡自旋模型对磁致铁电行为进行描述，并采用蒙特卡罗模拟对模型进行求解.重点考察不同磁交换耦合作用下，外磁场对体系磁化行为和电极化行为的调控.结果表明：子晶格B1离子贡献了体系的宏观磁化强度和电极化强度；近邻A-A和B位次近邻交换耦合参数的改变对子晶格A位磁性离子的磁电行为没有影响，但对B位离子的磁化强度和电极化强度有显著的调制作用，尤其是来源于子晶格B1的电极化强度对B位次近邻交换耦合参数的改变极为敏感；这些结果反映了立方尖晶石磁结构中A位和B位磁性离子环境及分布对称性的差异.

关键词: 尖晶石结构, 磁电耦合, 螺旋序, 海森堡模型

Abstract: To understand fantastic multiferroicity of CoCr₂O₄, a Heisenberg spin model on three-dimensional spinel lattice was constructed. In the model, we considered multiple magnetic interactions including nearest-neighbor A-A, A-B, B-B couplings as well as next-nearest-neighbor interaction among B sites. Monte Carlo simulation is employed to obtain magnetoelectric quantities. Influences of exchange couplings on magnetoelectric behaviors are emphatically investigated under rotation of magnetic field. It is found that macroscopic magnetization and polarization stem mainly from contributions of B1 ions. With varying exchange couplings of A-A interaction and next-nearest-neighboring B-B interaction among B-site ions, B-site ions exhibit prominent magnetoelectric responses, while A-site ions remain unchanged. It indicates distinct differences between symmetry and magnetic interaction environment for A-site and B-site ions in spinel lattice.

Key words: spinel structure, magnetoelectric coupling, spiral order, Heisenberg model

中图分类号:

O469

刘佳宏, 杜安, 齐岩. 尖晶石氧化物CoCr₂O₄的多铁性研究[J]. 计算物理, 2018, 35(4): 494-504.

LIU Jiahong, DU An, QI Yan. Investigation on Multiferroicity in Spinel Oxide CoCr₂O₄[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2018, 35(4): 494-504.

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尖晶石氧化物CoCr₂O₄的多铁性研究

Investigation on Multiferroicity in Spinel Oxide CoCr₂O₄

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