MicroSQUID Force Microscopy in a Dilution Refrigerator
 作者： D. J. Hykel,  Z. S. Wang,  P. Castellazzi,  T. Crozes,  G. Shaw,  K. Schuster,  K. Hasselbach 作者单位： 1CNRS, Institut Néel, Université Grenoble Alpes2Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science3Institut de Radioastronomie Millimétrique, Domaine Universitaire 刊名： Journal of Low Temperature Physics, 2014, Vol.175 (5-6), pp.861-867 来源数据库： Springer Journal DOI： 10.1007/s10909-014-1174-9 关键词： SQUID;  Scanning microscopy;  Superconductivty; 英文摘要： Abstract(#br)We present a new generation of a scanning microSQUID microscope operating in an inverted dilution refrigerator. The microSQUIDs have a size of 1.21 $$\ \upmu$$ μ m $$^{2}$$ 2 and a magnetic flux sensitivity of 120 $$\upmu \Phi _{0} / \sqrt{\text {Hz}}$$ μ Φ 0 / Hz and thus a field sensitivity of 550 $$\ \upmu \text {G}/ \sqrt{\text {Hz}}$$ μ G / Hz . The scan range at low temperatures is about 80 $$\upmu$$ μ m and a coarse displacement of 5 mm in x and y direction has been implemented. The microSQUID-to-sample distance is regulated using a tuning fork based force detection. A microSQUID-to-sample distance of 420 nm has been obtained. The reliable knowledge of this distance is necessary to obtain a trustworthy estimate of the... absolute value of the superconducting penetration depth. An outlook will be given on the ongoing direction of development.

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