Abstract

Magnetic properties of layered structures based on transition and rare-earth metals (TMs and REMs) such as Fe and Gd have attracted attention of researchers since 1990s. These materials are artificial ferrimagnets with reach magnetic phase diagrams, which make it possible to realize a wide spectrum of predefined properties. In recent years, a new surge of the interest in such systems was evoked by observations of new peculiar dynamic effects in these materials, including optical magnetization reversal and ultrafast motion of domain walls, as well as the possibility of realization of skyrmion magnetic states. In this article, a brief review of the most interesting features of magnetism and magnetic dynamics of layered ferromagnetic TM/REM structures is presented. The results of our investigation concerning Fe/Gd superlattices and the effects of Cr interlayers on their magnetic properties are reported. The surface cant of the magnetization in these structures has been observed directly using the magnetooptical Kerr effect, and the magnetic phase diagram of the system has been obtained. We have analyzed peculiarities of nonuniform modes of magnetic oscillations excited in the Fe/Gd superlattice by the ferromagnetic resonance method. The possibility of sign reversal of the exchange interaction of Fe and Gd layers from antiferromagnetic to ferromagnetic type upon the introduction of Cr interlayers between them has been demonstrated.

中文翻译：

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基于Gd和3d过渡金属的层状亚铁磁结构的磁性

摘要

自1990年代以来，基于过渡金属和稀土金属（TM和REM）（例如Fe和Gd）的层状结构的磁性能吸引了研究人员的注意。这些材料是具有到达磁相图的人造ferrimagnets，这使得可以实现各种预定义的特性。近年来，通过观察这些材料中新奇的动态效应，包括对光磁化反转和畴壁的超快运动，以及实现天生离子磁态的可能性，引起了人们对此类系统的新兴趣。在本文中，简要介绍了层状铁磁TM / REM结构的磁性和磁动力学的最有趣的特征。报道了我们关于Fe / Gd超晶格以及Cr中间层对其磁性的影响的研究结果。使用磁光克尔效应直接观察了这些结构中的磁化表面倾斜，并获得了系统的磁相图。我们已经通过铁磁共振方法分析了在Fe / Gd超晶格中激发的磁振荡的非均匀模式的特性。已经证明了在Fe和Gd层之间引入Cr中间层之后，Fe和Gd层的交换相互作用从反铁磁型转变为铁磁型的符号反转的可能性。得到系统的磁相图。我们已经通过铁磁共振方法分析了在Fe / Gd超晶格中激发的磁振荡的非均匀模式的特性。已经证明了在Fe和Gd层之间引入Cr中间层之后，Fe和Gd层的交换相互作用从反铁磁型转变为铁磁型的符号反转的可能性。得到系统的磁相图。我们已经通过铁磁共振方法分析了在Fe / Gd超晶格中激发的磁振荡的非均匀模式的特性。已经证明了在Fe和Gd层之间引入Cr中间层之后，Fe和Gd层的交换相互作用从反铁磁型转变为铁磁型的符号反转的可能性。