Magnetic domain structure and domain wall analysis of ferromagnetic MnAs nanodisks selectively-grown on Si (111) substrates for spintronic applications
Magnetic domain structure and domain wall analysis of ferromagnetic MnAs nanodisks selectively-grown on Si (111) substrates for spintronic applications
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DOI：
10.1063/1.5045241
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
R. Horiguchi;S. Hara;M. Iida
中科院分区：
文献类型：
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作者：
R. Horiguchi;S. Hara;M. Iida
我们报告的实验和分析结果的磁畴和磁畴壁结构的AlGaAs纳米柱缓冲区上的MnAs纳米盘选择性生长在Si（111）衬底上部分覆盖的介电SiO2薄膜掩模图案使用选择性区域金属有机气相外延。用磁力显微镜研究了MnAs纳米盘中磁畴结构的尺寸依赖性，结果表明，在面积约为3 × 104 nm 2或更小的MnAs纳米盘中，单畴占主导地位。还表明，在面积约为6 × 104 nm 2或更大的纳米盘中，特别是多畴，具有180°畴壁的两个磁畴结构是主要的。此外，在具有多个域的纳米盘的情况下，根据所获得的磁力显微镜图像的详细分析，不仅可能形成Neel壁，而且可能形成Bloch壁。这些结果表明，可以通过控制MnAs纳米盘尺寸来调节磁畴和畴壁，使其成为自旋电子应用中有趣的纳米结构。我们报道了在AlGaAs纳米柱缓冲层上选择性生长的MnAs纳米盘的磁畴和畴壁结构的实验和分析结果，该缓冲层在部分覆盖有电介质SiO2薄膜掩模图案的Si（111）衬底上使用选择性-区域金属有机气相外延。用磁力显微镜研究了MnAs纳米盘中磁畴结构的尺寸依赖性，结果表明，在面积约为3 × 104 nm 2或更小的MnAs纳米盘中，单畴占主导地位。还表明，在面积约为6 × 104 nm 2或更大的纳米盘中，特别是多畴，具有180°畴壁的两个磁畴结构是主要的。此外，在具有多个域的纳米盘的情况下，根据所获得的磁力显微镜图像的详细分析，不仅可能形成Neel壁，而且可能形成Bloch壁。这些结果表明，磁畴和畴壁是相互作用的。
We report on the experimental and analytic results on magnetic domain and domain wall structures of MnAs nanodisks on AlGaAs nanopillar buffers selectively grown on Si (111) substrates partially covered with dielectric SiO2 thin film mask patterns using selective-area metal-organic vapor phase epitaxy. The results on the size dependence of the magnetic domain structure in MnAs nanodisks investigated by magnetic force microscopy show that a single domain is predominant in the MnAs nanodisks with an area of approximately 3 × 104 nm2 or less. It is also indicated that in the nanodisks with an area of approximately 6 × 104 nm2 or more, multiple domains, in particular, two magnetic domain structures with a 180° domain wall, are predominant. In addition, in the case of nanodisks with multiple domains, not only Neel walls but also Bloch walls are possibly formed, according to the detailed analyses of the magnetic force microscope images obtained. These results suggest that the magnetic domains and domain walls can be tuned by the control of the MnAs nanodisk size making them interesting nanostructures for spintronic applications.We report on the experimental and analytic results on magnetic domain and domain wall structures of MnAs nanodisks on AlGaAs nanopillar buffers selectively grown on Si (111) substrates partially covered with dielectric SiO2 thin film mask patterns using selective-area metal-organic vapor phase epitaxy. The results on the size dependence of the magnetic domain structure in MnAs nanodisks investigated by magnetic force microscopy show that a single domain is predominant in the MnAs nanodisks with an area of approximately 3 × 104 nm2 or less. It is also indicated that in the nanodisks with an area of approximately 6 × 104 nm2 or more, multiple domains, in particular, two magnetic domain structures with a 180° domain wall, are predominant. In addition, in the case of nanodisks with multiple domains, not only Neel walls but also Bloch walls are possibly formed, according to the detailed analyses of the magnetic force microscope images obtained. These results suggest that the magnetic domains and domain walls c...