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本文报道了我们利用平面铌膜微桥与半圆柱面形铌箔互相扣合制成的组合式dcSQUID器件。铌桥的临界电流曾利用我们改进过的脉冲处理方法加以调整,使之达到所期望的数值。这种SQUID的现有磁场灵敏度为1.3×10~(-8)G/(Hz)~1/2,主要的限制在于电子线路而不在SQUID器件。器件的稳定性及寿命相当令人满意,其中一个器件在一年半的时间内经历过60多次的室温—液氦循环,性能未见明显变化。 相似文献
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为了方便地测试直流SQUID器件的I-V及V-H特性曲线,我们利用二只国产的FC54C线性组件,分别做积分器和加法器,装了一台线性扫描器。本文详细地介绍了线路的调试及用途,并附印刷线路扳布线图. 相似文献
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The oxygen and silicon ions have been obtained respectively from pulsed energetic dense oxygen plasma and silane plasma generated by electrodeless discharge. The oxygen ions have been injected into superconducting Nb films, and the Si ions into superconducting YBCO films in order to investigate the variation of their superconductivity with the ions injected into them. Auger profile data show that the injection depths range from 20 to 40nm in the films, depending on the injection condition and film material. The resistance-temperature relations (R-T curves) indicate that the superconductivity remains unchanged in the photoresist-masked part of the film, but is significantly changed in the exposed part. The evenness of the film surface remains unchanged after injection. This technique may serve as an alternative to the planar inhibiting fabrication technique in the fabrication of the multi-layer structure of superconducting films, and also possibly to the conventional plasma source ion implantation technique in material surface processing. 相似文献