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An automated and versatile ultra-low temperature SQUID magnetometer

A. Morello, W. G. J. Angenent, G. Frossati, L. J. de Jongh

physics.ins-detarXiv:physics/0406098

Abstract

We present the design and construction of a SQUID-based magnetometer for operation down to temperatures T = 10 mK, while retaining the compatibility with the sample holders typically used in commercial SQUID magnetometers. The system is based on a dc-SQUID coupled to a second-order gradiometer. The sample is placed inside the plastic mixing chamber of a dilution refrigerator and is thermalized directly by the 3He flow. The movement though the pickup coils is obtained by lifting the whole dilution refrigerator insert. A home-developed software provides full automation and an easy user interface.

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