1. MicroSQUID Force Microscopy in a Dilution Refrigerator
- Author
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Danny Hykel, Thierry Crozes, Klaus Hasselbach, Zhaosheng Wang, Gorky Shaw, K. F. Schuster, Pauline Castellazzi, beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Chinese Academy of Sciences [Changchun Branch] (CAS), Nanofab (Nanofab), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Magnétisme et Supraconductivité (MagSup), Institut de RadioAstronomie Millimétrique (IRAM), Centre National de la Recherche Scientifique (CNRS), Ministère des Affaires Etrangères, ANR-09-BLAN-0211,TETRAFER(2009), European Project, Nanofabrication (NEEL - Nanofab), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), and Magnétisme et Supraconductivité (NEEL - MagSup)
- Subjects
Physics ,Superconductivity ,Field (physics) ,Condensed matter physics ,Condensed Matter - Superconductivity ,FOS: Physical sciences ,Absolute value ,SQUID ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Magnetic flux ,law.invention ,Superconductivity (cond-mat.supr-con) ,[PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] ,Scanning Microscopy ,law ,General Materials Science ,Sensitivity (control systems) ,Dilution refrigerator ,Tuning fork ,Penetration depth - Abstract
We present a new generation of a scanning MicroSQUID microscope operating in an inverted dilution refrigerator. The MicroSQUIDs have a size of 1.21$ \ \mu$m\textsuperscript{2} and a magnetic flux sensitivity of 120 $\mu\Phi_{0} / \sqrt{\textrm{Hz}}$ and thus a field sensitivity of %$550^{-6} \ \Phi_{0} / \sqrt{\textrm{Hz}}$ 550$ \ \mu \textrm{G}/ \sqrt{\textrm{Hz}}$. The scan range at low temperatures is about 80 $\mu$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.
- Published
- 2014