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The magnetization reversal of Fe/Cu(100) ultrathin films grown at
room temperature is investigated by using an in situ
magneto-optical Kerr effect polarimeter with a magnet that can
rotate in a plane of incidence. There occur spin reorientation
transitions from out-of-plane to in-plane magnetizations in 8 and 12
monolayers (ML) thick iron films. The coercive fields are observed
to be proportional to the reciprocal of the cosine with respect to
the easy axis, suggesting that the domain-wall displacement plays a
main role in the magnetization reversal process. 相似文献
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非计算机专业计算机系列课程网络辅助教学系统的实践 总被引:2,自引:0,他引:2
以教育现代化及实现教育现代化所依据的现代教育技术为指导,结合计算机系列课程网络辅助教学系统初步实践经验,提出了网络辅助教学的现实意义。 相似文献
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以p-全氟壬烯氧基苯磺酰氯(Ⅰ)为原料,经酰胺化和季胺化两步反应,制备了N-3-(二甲氨基丙基)对全氟壬烯氧基苯磺酰胺(Ⅱ)和N-[3-(p-全氟壬烯氧基苯磺酰胺基)丙基]-N,N-二甲基乙酸铵(Ⅲ),用FTIR、1HNMR、ESI-MS对II和III的结构进行了表征。中间体N-3-(二甲氨基丙基)对全氟壬烯氧基苯磺酰胺(Ⅱ)的较优合成工艺条件为:溶剂为二氯甲烷,n(Ⅰ):n(N,N-二甲基丙二胺)=1:1.75,20℃反应4 h,Ⅱ的收率可达99.49%。N-[3-(p-全氟壬烯氧基苯磺酰胺基)丙基]-N,N-二甲基乙酸铵(Ⅲ)的较优合成工艺条件为:n(Ⅱ):n(氯乙酸钠)=1:1.1,n(Ⅱ):n(碳酸氢钠)=1:1.5,60℃反应9 h,Ⅲ的收率为93.58%。 相似文献
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The growth of Mn5Ge3 ultrathin films with different thicknesses, prepared by solid phase epitaxy, is studied. The results of scanning tunnelling microscopy and low energy electron diffraction studies show that the film can be formed and it is terminated with a (√3 × √3) R30° surface reconstruction when the thickness of Mn exceeds 3 monolayers. The magnetic properties show that the Curie temperature is about 300 K and the T^2-dependent behaviour is observed to remain up to 220 K. 相似文献
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介绍通信卫星的I/O特性的在轨测试方法,内容包括测试系统的设备构成、测试方法等关键技术问题。以及对通信卫星实际在轨测试的测试结果。 相似文献