Photoelectron Spectroscopy and Magnetic Properties of Manganese Pnictides Nanocrystals Formed on Passivated GaAs Substrates
Photoelectron Spectroscopy and Magnetic Properties of Manganese Pnictides Nanocrystals Formed on Passivated GaAs Substrates
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钝化 GaAs 衬底上形成的锰磷族化合物纳米晶体的光电子能谱和磁性能
DOI：
10.7567/jjaps.38s1.373
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发表时间：
1999
影响因子：
1.5
通讯作者：
Y. Watanabe
中科院分区：
文献类型：
--
作者：
M. Oshima;K. Ono;M. Mizuguchi;Takeshi Uragami;H. Fujioka;Masaaki Tanaka;Y. Watanabe
我们首先报告的MnAs和MnSb纳米晶体的形成和磁性能的“超级沃尔默-韦伯外延”利用非常低的表面能基板，如硫钝化的GaAs基板。在S钝化的GaAs表面上，成功地生长了尺寸约为16 nm、密度约为2×1010 cm-2的MnAs点。SQUID分析表明，这些点的易磁化轴部分垂直。然而，在Se-GaAs表面上，没有生长MnAs点。SRPES显示，硒原子被隔离到MnAs表面，可能发挥了表面活性剂的作用，层生长模式。
We first report the formation and magnetic properties of MnAs and MnSb nanocrystals by “super Volmer-Weber epitaxy” utilizing very low surface energy substrates such as sulfur-passivated GaAs substrates. On the S-passivated GaAs surface, MnAs dots with the size of about 16 nm and the density of 2×1010 cm-2 were successfully grown. SQUID analysis of these dots showed partly vertical easy magnetization axis. However, on the Se-GaAs surface, no MnAs dots were grown. SRPES revealed that Se atoms were segregated to the MnAs surface, probably playing a role of surfactant for the layer growth mode.