Magnetic properties of InMnAs nanodots prepared by MOVPE
Magnetic properties of InMnAs nanodots prepared by MOVPE
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DOI：
10.1016/j.jmmm.2012.09.041
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发表时间：
2013-02-01
影响因子：
2.7
通讯作者：
Reiffers, M.
中科院分区：
文献类型：
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作者：
Novak, J.;Dujavova, A.;Reiffers, M.
研究了低压金属有机物气相外延自组装In 1-xMnxAs纳米点的铁磁性能。纳米点结构在500摄氏度的温度和100毫巴的反应器压力下生长在（100）GaAs衬底上。磁化强度测量表明，高达MnAs的摩尔分数x类似于0.143，纳米点结构呈现出典型的稀磁半导体性质，即居里温度取决于合金中的Mn含量。高于该摩尔分数，居里温度变为恒定值353 K。电子衍射图谱显示存在两种具有不同晶格常数的锌-尖晶石结构。我们认为，锌锰砷是负责这种行为。没有观察到NiAs结构的存在，这是典型的常见的六角MnAs。(c)2012爱思唯尔有限公司版权所有。
Ferromagnetic properties of self assembled In1-xMnxAs nanodots prepared by low pressure metalorganic vapor phase epitaxy were studied. Nanodot structures were grown on (100) GaAs substrates at the temperature of 500 degrees C and reactor pressure of 100 mbar. Magnetization measurements indicated that up to MnAs molar fraction of x similar to 0.143, nanodot structures presented typical properties of diluted magnetic semiconductors, i.e. Curie temperature depends on the Mn content in the alloy. Above this molar fraction, the Curie temperature becomes constant at the value of 353 K. Electron diffraction patterns showed presence of two zinc-blende structures with different lattice constants. We suppose that zinc-blende MnAs is responsible for this behavior. No presence of NiAs structure that is typical for common hexagonal MnAs was observed. (c) 2012 Elsevier B.V. All rights reserved.