Cr薄膜のスピン構造制御と磁性探査

概要

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Chromium is an exotic antiferromagnet, which has a spin-density-wave (SDW) antiferromagnetic structure below 311 K in bulk. The magnetic structure sensitively changes in response to environmental conditions, such as interfacial boundary conditions. In this article, it is shown that the magnetic structure of Cr films can be controlled by periodic replacement of Cr (001) atomic layers by nonmagnetic (e.g. Sn) monatomic layers. The magnetic moments of Cr in the neighborhood of the substituted layers are enhanced or suppressed, depending on the substituted element, and this effect results in pinning of antinodes or nodes of SDW modulation at the interfaces. The replacement of Cr atomic layers by Sn was also used to investigate the magnetism of Cr in Fe/Cr multilayers with relatively thin Cr layer thickness. It was found that the magnetic moments of Cr become smaller as the Cr layer thickness decreases. These results open up the possibility of creating novel magnetic structures by engineering nanoscale structures of magnetic materials with itinerant electrons.
社団法人日本磁気学会の論文
2003-07-01