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Influence of spin–orbit coupling on spin-polarized electronic transport in magnetic semiconductor nanowires with nanosized sharp domain walls 下载免费PDF全文
Influence of spin–orbit coupling on spin-polarized electronic transport in magnetic semiconductor nanowires with nanosized sharp domain walls is investigated theoretically.It is shown that the Rashba spin–orbit coupling can enhance significantly the spin-flip scattering of charge carriers from a nanosized sharp domain wall whose extension is much smaller than the carrier's Fermi wavelength.When there are more than one domain wall presented in a magnetic semiconductor nanowire,not only the spin-flip scattering of charge carriers from the domain walls but the quantum interference of charge carriers in the intermediate domain regions between neighboring domain walls may play important roles on spin-polarized electronic transport,and in such cases the influences of the Rashba spin–orbit coupling will depend sensitively both on the domain walls' width and the domain walls' separation. 相似文献
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以MnSO4, (NH4)2S2O8为反应物,Ag+作为催化剂的溶液相方法合成了线团状的α-MnO2。采用XRD、SEM和TEM等手段对合成产物进行了表征。发现反应温度和反应时间对产物的结晶度和形貌有很大的影响。通过恒电流充电/放电测试和循环伏安法(CV)对最终产物的电化学性能进行了表征。结果表明,由于其独特的形态,25 ℃下反应2 d的产物作为锂离子电池正极材料,表现出良好的循环稳定性(100次循环后放电比容量为124 mAh·g-1)。线团状α-MnO2在锂离子电池应用中可能是一个潜在的正极材料。 相似文献
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采用射频磁控溅射方法,在Si(111)和石英衬底上制备了Fe/Si亚层厚度比不同的多层膜。多层膜的总厚度为252nm,Fe/Si亚层厚度比分别为1nm/3.2nm、2nm/6.4nm和20nm/64nm。在850℃,Ar气气氛中退火2h后,Si衬底上的多层膜完全生成了β-FeSi2相。但石英衬底上同样Fe/Si亚层厚度比的多层膜除了生成β-FeSi2相,还生成了少量的ε-FeSi相。通过增加Si亚层的厚度至Fe/Si亚层厚度比为2nm/7.0nm,在石英衬底上也获得了单相的β-FeSi2薄膜,其光学带隙为0.87eV,表面均方根粗糙度为2.34nm。 相似文献
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In this paper, we study the static dielectric function and interaction potential in strong coupling limit with AdS/CFT correspondence. The dielectric function is depressed compared with that in weak coupling. The interaction potential then presents a weaker screening characteristics in strong coupling, which indicates a smaller Debye mass compared with weak coupling. 相似文献
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