A位稀土离子磁性对E-型反铁磁序锰氧化物多铁性的影响

项目名称： A位稀土离子磁性对E-型反铁磁序锰氧化物多铁性的影响

项目编号： No.U1204111

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 张娜

作者单位： 河南师范大学

项目金额： 30万元

中文摘要： 单相多铁性锰氧化物材料，是凝聚态物理与材料物理近年来关注的焦点。在E-型反铁磁序锰氧化物中，目前普遍接受的观点是Mn3+的共线“zig-zag”自旋结构导致了交换收缩，从而产生了宏观的铁电极化。这种特殊的磁电耦合机制诱导产生的铁电极化远大于螺旋序锰氧化物体系，接近常规铁电体，因此对这类材料的研究具有重要意义。本项目以位于螺旋序和E型反铁磁序相边界处的YMnO3和HoMnO3为研究对象，重点关注A位离子磁性对E-型反铁磁序锰氧化物多铁性起源的影响以及其性能优化途径。主要研究内容包括：a) 通过A位离子掺杂调控体系中的复杂交互作用，以此调控体系多铁性行为，深入研究E-型反铁磁序锰氧化物的多铁性起源机制；b) 通过应力、掺杂等实验手段，调控E-型反铁磁序锰氧化物材料的多铁性。

中文关键词： 多铁性；E-型反铁磁序；掺杂效应；；

英文摘要： The investigation on single-phase multiferroic manganites has been always a hot topic in the fields of condensed matter physics and materials physics in recent years. Due to the exclusion between magnetization and ferroelectricity, the origin of the multiferroicity is complex. However, in the E-type antiferromagnetic (E-AFM) manganites, it is widely accepted that the collinear “zig-zag” spin structure of Mn3+ leads to the symmetric exchange striction, which then induces the appearance of ferroelectricity. This multiferroic mechanism is special, and the ferroelectricity in these E-AFM manganites is great larger than that of cyclodial manganites, closing to that of proper ferroelectrics, so the research on these manganites with E-AFM spin structures is significant and receives special attentions. In this research project, we select typical materials YMnO3 and HoMnO3 as prototypes and focus our attentions on the effect of A-site magnetic property on the multiferroic mechanism of E-AFM manganites and properties optimizing. The details of this research project include: a) Obtain a further understanding of the multiferroic mechanism of E-AFM manganites through substitution the A-site ionic with else elements, which is an effective way to modulate the complex spin exchange interaction and then the multiferroicity；b) O

英文关键词： multiferroicity；E-type antiferromagnet；doping effect；；