文章信息/Info

Title:

Multiferroicity in hexaferrites

作者:

王遼宇; 曹慶琪; 王敦輝; 都有為

(南京大學物理學院 固體微結構國家重點實驗室, 江蘇 南京 210093)

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.)

關鍵詞:

單相多鐵性材料; 六角鐵氧體; 磁電耦合效應。

DOI:

10.7502/j.issn.1674-3962.2013.02.02

摘要:

單相多鐵性材料一般指鐵電性和鐵磁性共存的一類特殊功能材料。鐵電性和鐵磁性間的相互耦合導致外加磁場能影響其鐵電序或者外加電場能影響其磁有序。這種磁電耦合效應使得諸多新型功能器件的實用成為可能，例如超敏傳感器、電寫磁讀技術、高密度四態存儲，低能耗邏輯器件等。按鐵電性起源可以將單相多鐵性材料劃分為第一類和第二類多鐵性材料：第一類多鐵性材料中，鐵電序和磁有序的物理起源相互獨立；而第二類多鐵性材料的鐵電序來源于其特殊的磁有序結構。六角鐵氧體作為第二類多鐵性材料中的典型代表，近十年來得到廣泛而深入的研究。歸納了近期六角鐵氧體多鐵性研究的主要進展，介紹了其多鐵性起源、磁電耦合機制以及功能器件應用方面的科研成果，并對六角鐵氧體多鐵性的研究進行了展望。

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