多铁性异质结:1+1≠2

Multiferroic heterojunctions:1+1≠ 2

基于异质结界面而得以实现的复合型多铁性或磁电耦合性质本质上是一种呈展现象,即这种性质不是其组成成分单独所具有的特性,这体现了材料体系从简单到复杂过程中的某种跳跃式发展过程,即1+1≠2。文章主要介绍了近年来在多铁性异质结上的一些研究进展,包括界面磁电效应、多铁性隧道结以及基于异质结构的电控磁性等。这些进展表明,异质结研究极有可能是多铁性研究走向实用化的突破口。

Multiferroicity or magnetoelectric coupling that occurs in composite materials is realized through interfaces of the heterostructures. It is essentially a so-called emergent phenom- enon, which is not exhibited in either of the heterostructure constituents alone. This represents a kind of sudden leap process in the evolution from simple to complex material systems, i.e. 1 ＋ 1≠ 2. This paper focuses on recent studies of multiferroic heterojunctions, including interface magneto- electric effects, multiferroic tunnel junctions, and electric-field control of magnetism based on het- erostructures. These achievements suggest that heterostructures might represent a breakthrough for practical applications utilizing multiferroicity.