六角铁氧体的多铁性-中国材料进展

文章信息/Info

Author(s):: Liaoyu Wang; Qingqi Cao; Dunhui Wang; Youwei Du; (National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People Republic of China.)

摘要:: 单相多铁性材料一般指铁电性和铁磁性共存的一类特殊功能材料。铁电性和铁磁性间的相互耦合导致外加磁场能影响其铁电序或者外加电场能影响其磁有序。这种磁电耦合效应使得诸多新型功能器件的实用成为可能，例如超敏传感器、电写磁读技术、高密度四态存储，低能耗逻辑器件等。按铁电性起源可以将单相多铁性材料划分为第一类和第二类多铁性材料：第一类多铁性材料中，铁电序和磁有序的物理起源相互独立；而第二类多铁性材料的铁电序来源于其特殊的磁有序结构。六角铁氧体作为第二类多铁性材料中的典型代表，近十年来得到广泛而深入的研究。归纳了近期六角铁氧体多铁性研究的主要进展，介绍了其多铁性起源、磁电耦合机制以及功能器件应用方面的科研成果，并对六角铁氧体多铁性的研究进行了展望。

Abstract:: The single-phase multiferroics is a kind of functional material, in which the coexisting ferromagnetic and ferroelectric properties couple each other. Due to themagnetoelectric coupling effect, the magnetic(ferroelectric) properties can be controlled by external electric(magnetic) field. Furthermore, this couplingmakes it possible to design some new functional devices, such as hypersensitive sensors，electric-writing and magnetic-reading technique, high density four-state storage，and low-power logic devices. According to the origin of the ferroelectricity, the single-phase multiferroics can be classified to type-I and type-II. In type-I multiferroics, theferroelectricity and magnetism have different origins and the coupling effect between them is always weak. In type-II multiferroics,the ferroelectricity is arisen from the special spin configuration, namely magnetically- driven-ferroelectricity. As a typical type-II multiferroics, hexaferrites were investigated intensively in the last decades. This paper presents the recent research progress of multiferroic hexaferrites. The origin of ferroelectric order, the mechanism of the magnetoelectric coupling and the functional application of hexaferrites are introduced and discussed. Finally, the future development of the multiferroic hexaferrites is proposed