Tiny adiabatic-demagnetization refrigerator for a commercial superconducting quantum interference device magnetometer

A tiny adiabatic-demagnetization refrigerator (T-ADR) has been developed for a commercial superconducting quantum interference device magnetometer [Magnetic Property Measurement System (MPMS) from Quantum Design]. The whole T-ADR system is fit in a cylindrical space of the diameter \(8.5\) mm and th...

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Bibliographic Details
Published in:arXiv.org 2016-12
Main Authors: Sato, Taku J, Okuyama, Daisuke, Kimura, Hideo
Format: Article
Language:English
Subjects:
Adiabatic flow
Demagnetization
Gadolinium
Interference
Magnetic properties
Magnetism
Magnetization
Refrigerants
Superconducting quantum interference devices
Superconductivity
Variations
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Summary:A tiny adiabatic-demagnetization refrigerator (T-ADR) has been developed for a commercial superconducting quantum interference device magnetometer [Magnetic Property Measurement System (MPMS) from Quantum Design]. The whole T-ADR system is fit in a cylindrical space of the diameter \(8.5\) mm and the length \(250\) mm, and can be inserted into the narrow sample tube of MPMS. A sorption pump is self-contained in T-ADR, and hence no complex gas handling system is necessary. With the single crystalline Gd\(_3\)Ga\(_5\)O\(_{12}\) garnet (\(\sim 2\) grams) used as a magnetic refrigerant, the routinely achievable lowest temperature is \(\sim 0.56\) K. The lower detection limit for a magnetization anomaly is \(\sim 1 \times 10^{-7}\) emu, estimated from fluctuation of the measured magnetization. The background level is \(\sim 5 \times 10^{-5}\) emu below 2 K at \(H = 100\) Oe, which is largely attributable to a contaminating paramagnetic signal from the magnetic refrigerant.
ISSN:2331-8422
DOI:10.48550/arxiv.1612.01376