半導体表面への磁性ナノ構造の成長と物性

概要

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Epitaxial ferromagnetic materials grown on semiconductor substrates have attracted much attention as novel magneto-electronic devices. Furthermore, agreat deal of attention has been paid to nano-scale magnetic materials, both for their potential value in improving fundamental understanding of nanomagnets and for their practical applications in tera-bit magnetic memor es. In this report, we review the latest results on the magnetic nanostructures of manganese pnictide compounds hetero-epitaxially grown on GaAs substrates by molecular beam epitaxy (MBE). The first topic is the 2-dimensional magnetic nanostructure, namely, MnAs/MnSb multilayers on GaAs (111) B, which showed unique temperature-dependent magnetic interlayer coupling. The second topic is the 1-dimensional magnetic nanostructure, namely, MnAs magnetic nanowires grown on sapphire stepped substrates. The third topic is the 0-dimensional magnetic nanostructure, namely, MnAs and MnSb ferromagnetic dots grown on sulfur-passivated GaAs (100) surfaces. AFM, TEM, and MCD analyses reveal that the coalescence drastically changes the magnetic properties, and XPS analysis reveals that the Mn 3d electrons are localized.
社団法人日本磁気学会の論文
2000-02-01