VR. SoBolo.N. Mazurenkoand A.A. Drozd(Institute of Solid State and Semiconductor Physics
,
ASB P. Brovka Str.
,
17
,
Minsk 220072
,
Belarus)
金属学报(英文版)
Galvanomagnetic properties of metals at boiling point of liquid helium and some prob-lems relating to Joule heating in cylinder conductors are investigated by the method of voltage current characteristics. Radial current under an external coaxial magnetic field is used to get high magnetoresistance of conductor. High level of magnetore-sistance in this geometry offers the possibility to investigate a wide range of heat generation. The stabilization of voltage observed in definite current range is discussed in terms of analysis of heat aspects of problem when a heat genemtion function and heat elimination they are regarded at helium temperuture. An electric temperature ordering of system is proposed as a factor responsible for voltage stabilization when the presence of more heated and less heated sections along conductor radius is connected with negativity of derivative of heat elimination function with respect to temperature between first and second boiling crisis.
关键词:
galvanomagnetic property
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null
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null
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null
蒿建龙
,
刘喆颉
,
康爱国
人工晶体学报
研究了在自由层厚度影响下的界面垂直各向异性和磁矩偏角,对水平CoFeB/MgO磁隧道结阈值翻转电流密度、翻转时间动态特性的作用.基于LLGS方程的宏自旋模型的模拟,结果显示,由于界面垂直各向异性随着自由层厚度的减小而增大,阈值翻转电流密度和翻转时间会明显的降低,当磁矩的偏角随厚度的减小而增大时,翻转的动态特性会有进一步优化,在阈值翻转电流密度和翻转时间上都有体现.
关键词:
CoFeB/MgO
,
磁隧道结
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微磁
,
各向异性
,
电流密度
范爱玲
,
丁艳凤
,
张姗
,
马捷
,
魏建忠
稀有金属材料与工程
为了实现钨螺旋线表面镀金薄膜质量可控,研究了无氰电镀过程中工艺参数如电流密度、镀液温度和沉积时间对镀金层质量的影响规律.利用扫描电子显微镜对镀金层形貌进行观察分析.结果表明:电流密度影响镀金薄膜的表面平整度及晶粒大小;镀液温度影响无氰镀液稳定性,从而影响薄膜的表面光泽度及平整度;电沉积时间对镀层覆盖效果影响较大.沉积时间过短,镀层覆盖效果差;时间过长,边角效应严重.沉积时间宜控制在1.5 h内.
关键词:
钨螺旋线
,
镀金
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电流密度
,
镀液温度
,
沉积时间
