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Study of Metallic Multilayers Consisting of Magnetic and Superconducting Components

磁性和超导元件组成的金属多层膜的研究

基本信息

批准号：
63420010
负责人：
SHINJO Teruya
金额：
$ 24.26万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The subject of this research is to study the magnetic and superconducting behaviors in artificially structured superlattices and to discover any new phenomenon as a result of their interplay. For this purpose, an experimental setup has been performed to prepare ultrathin oxide films by using the oxidation chamber connected to the ultrahigh vacuum deposition system, where ultrathin metal layers are prepared by controlling the thickness on an atomic scale. For the magnetization measurements, a sample-vibrating magnetometer was equipped.A remarkable advance was achieved in the study of magnetic/nonmagnetic multilayers and artificially prepared ferromagnetic monolayer systems have been investigated. It has been recently found that the interlayer coupling is an interesting subject. The interaction between Fe layers through Au layer was found to change the sign at about 70 A.A new type magnetoresistance was found in multilayers with antiparallel magnetic structure, such as Fe/Cr and Cu/Co/Cu/Ni (Fe). An antiparallel structure is realized by an interlayer antiferromagnetic coupling in the former case, and the antiparallel magnetic structure has been directly confirmed by neutron diffraction. In the latter case, the difference of coercive fields is the cause of antiparallel spin structure and therefore the MR change can be induced by very small fields. Such large MR effects are regarded to be characteristic of artificial metallic multilayers.Transport phenomena in the direction perpendicular to the multilayered films are very attractive problems. Samples for the tunneling measurements are prepared by using the oxidation chamber.

这项研究的目的是研究人工结构超晶格中的磁性和超导行为，并发现它们之间相互作用的任何新现象。为此，我们建立了一套实验装置，利用与超高真空沉积系统相连的氧化室来制备超薄的氧化膜，在该系统中，通过在原子尺度上控制厚度来制备超薄的金属膜。在磁化强度测量方面，采用了样品振动式磁强计。磁性/非磁性多层膜的研究取得了显著进展，人工制备的铁磁性单层膜系统也得到了研究。最近发现，层间耦合是一个有趣的课题。发现Fe层与Au层之间的相互作用在70A左右改变了磁阻符号，在具有反平行磁结构的多层膜中发现了一种新的磁阻类型，如Fe/Cr和Cu/Co/Cu/Ni(Fe)。前者通过层间反铁磁耦合实现了反平行结构，并用中子衍射直接证实了反平行磁结构。在后一种情况下，矫顽场的差异是反平行自旋结构的原因，因此很小的场就能引起MR变化。如此大的磁流变效应被认为是人造金属多层膜的特征，垂直于多层膜方向的输运现象是非常吸引人的问题。利用氧化室制备了用于隧道测量的样品。