Abstract
In this paper, a simple and easy-to-install low magnetic field extension of the SQUID magnetometer Quantum Design MPMS-7 is described. This has been accomplished by complementing the MPMS-7 magnet control system with a laboratory current supply for the low magnetic field region (B ⩽ 200 G). This hardware and software upgrade provides a significant gain in the magnetic field accuracy up to an order of magnitude compared with the standard instrument’s setup and is improving the resolution to better than 0.01 G below 40 G. The field control has been integrated into the Quantum Design MultiVu software for transparent and user-friendly operation of this extension. The improvements achieved are especially useful when low magnetic field strengths (B < 1 G) are required at high precision. The specific advantages of this application are illustrated by sophisticated magnetic characterization of low-dimensional superconductors like Sc3CoC4 and SnSe2{Co(η-C5 H5)2}x.
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