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Effect of Annealing on Structural and Magnetic Properties of a Thick (Ga,Mn)As Layer 总被引:3,自引:0,他引:3
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We investigate effects of annealing on magnetic properties of a thick (Ga,Mn)As layer, and find a dramatic increase of the Curie temperature from 65 to 115K by postgrowth annealing for a 500-nm (Ga,Mn)As layer.Auger electron spectroscopy measurements suggest that the increase of the Curie temperature is mainly due to diffusion of Mn interstitial to the free surface. The double-crystal x-ray diffraction patterns show that the lattice constant of (Ga,Mn)As decreases with increasing annealing temperature. As a result, the annealing induced reduction of the lattice constant is mainly attributed to removal of Mn interstitial. 相似文献
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Photoluminescence of GaAs0.973Sb0.022N0.005 is investigated at different temperatures and pressures. Both the alloy band edge and the N-related emissions, which show different temperature and pressure dependences, are observed. The pressure coefficients obtained in the pressure range 0-1.4GPa for the band edge and N-related emissions are 67 and 45meV/GPa, respectively. The N-related emissions shift to a higher energy in the lower pressure range and then begin to redshift at about 8.5GPa. This redshift is possibly caused by the increase of the X-valley component in the N-related states with increasing pressure. 相似文献
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Electro-oxidation of Formic Acid on Carbon Supported Edge-Truncated Cubic Platinum Nanoparticles Catalysts
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The oxidation of formic acid on edge-truncated cubic platinum nanoparticles/C catalysts is investigated. X-ray photoelectron spectroscopy analysis indicates that the surface of edge-truncated cubic platinum nanoparticles is composed of two types of coordination sites. '/'he oxidation behavior of formic acid on edge-truncated cubic platinum nanoparticles/C is investigated using cyclic voltammetry. The apparent activation energies are found to be 54.2, 55.0, 61.8, 69.5, 71.9, 69.26, 65.28k J/tool at 0.15, 0.3, 0.4, 0.5, 0.6, 0.65, 0.7V, respectively. A specific surface area activity of 1.76 mA·cm^-2 at 0.4 V indicates that the edge-truncated cubic Platinum nanoparticles are a promising anode catalyst for direct formic acid fuel cells. 相似文献
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真空镀膜技术广泛应用于现代科学技术的很多领域。起初最主要用于光学薄膜。最典型的方法是采用真空蒸发法将成膜材料按设计要求淀积在工件表面从而获得所需的反射、增透、截止、带通、偏振等效果。 相似文献
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This paper has systematically investigated the substrate temperature and
thickness dependence of surface morphology and magnetic property of CrAs
compound films grown on GaAs by molecular-beam epitaxy. It finds that the
substrate temperature affects the surface morphology and magnetic property
of CrAs thin film more potently than the thickness. 相似文献
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Growth and Magnetic Properties of Zincblende CrSb Epilayers on Relaxed and Strained (In, Ga)As Buffers
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Zincblende CrSb (zb-CrSb) layers with room-temperature ferromagnetism have been grown on relaxed and strained (In,Ga)As buffer layers epitaxially prepared on (001) GaAs substrates by molecular-beam epitaxy. The structural characterizations of CrSb layers fabricated under the two cases are studied by using synchrotron grazing incidence x-ray diffraction (GID). The results of GID experiments indicate that no sign of second phase exists in all the zb-CrSb layers. Superconducting quantum interference device measurements demonstrate that the thickness of zb-CrSb layers grown on both relaxed and strained (In,Ga)As buffer layers can be increased to ~12 monolayers (~3.6nm), compared to ,~3 monolayers (~1 nm) on GaAs directly. 相似文献
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采用压力光谱技术在低温下观测到了Mn2+离子的4T1→6A1跃迁,该谱线在Zn0.83Mn0.17Se和ZnSe/Zn0.84Mn0.16Se超晶格样品中有不同的压力行为,体材料中其压力系数为-42.4 peV/Pa,超晶格中为-29.5 peV/Pa。用晶体场理论计算得到体材料Zn0.83Mn0.17Se中Mn2+离子4T1→6A1谱线的压力系数为-38.3 peV/Pa,与实验结果基本一致。结合材料中发光峰积分强度随压力的变化关系进行分析,证实Mn2+离子的发光性质主要与其近邻的晶体场环境有关。 相似文献