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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Magnetic heterostructures: examples and perspectives
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Magnetic heterostructures: examples and perspectives

机译：磁性异质结构：实例和观点

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Artificial magnetic heterostructures and superlattices have received much attention in recent years because of their scientific and technological relevance. Heterostructures consist of different material layers promising jointly to display physical properties different from any of their single layers. Paramagnetic layers sandwiched between ferromagnetic films are an excellent example of a magnetic heterostructure, since together they display an oscillatory exchange coupling as a function of the paramagnetic spacer thickness not present in any single layer. The strength of the exchange coupling and the oscillation period depend on the details of the Fermi surfaces involved, whereas the overall features of the exchange coupling appear universal. More complex couplings are observed for magnetic superlattices with Cr spacer layers. This is due to the intrinsic spin-density wave state of Cr. Extensive experiments with synchrotron and neutron radiation have recently unravelled the Nt el state of thin Cr layers and proximity effects between Fe and Cr, elucidating the mutual interdependence of the Cr spin structure and the Fe exchange coupling. In Co/Cr superlattices the structural mismatch between hcp Co and bcc Cr adds another complexity, which affects strongly the magnetic anisotropy. Utilizing the different coercivities of Co and Fe layers, spin valve systems can be constructed from Co/Cr/Fe heterostructures. Both the current status and some future perspectives are briefly reviewed here. [References: 39]
机译：近年来，人造磁异质结构和超晶格由于其与科学技术的联系而备受关注。异质结构由不同的材料层组成，这些材料层有望共同显示不同于其任何单层的物理性质。夹在铁磁膜之间的顺磁性层是磁性异质结构的一个很好的例子，因为它们一起表现出振荡交换耦合，这是任何单个层中都不存在的顺磁性隔离层厚度的函数。交换耦合的强度和振荡周期取决于所涉及的费米表面的细节，而交换耦合的整体特征似乎是通用的。对于具有Cr间隔层的磁性超晶格，观察到更复杂的耦合。这是由于Cr的固有自旋密度波状态。同步加速器和中子辐射的大量实验最近揭示了薄Cr层的Nt el状态以及Fe和Cr之间的邻近效应，从而阐明了Cr自旋结构与Fe交换耦合的相互依赖性。在Co / Cr超晶格中，hcp Co和bcc Cr之间的结构失配会增加另一种复杂性，这会严重影响磁各向异性。利用Co和Fe层的不同矫顽力，可以从Co / Cr / Fe异质结构构建自旋阀系统。此处简要回顾了当前状态和一些未来观点。 [参考：39]

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