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arXiv · 1612.01376

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

Taku J Sato·Daisuke Okuyama·Hideo Kimura
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Abstract

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.

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Taku J Sato, Daisuke Okuyama, Hideo Kimura. 2016-12-02. Tiny adiabatic-demagnetization refrigerator for a commercial superconducting quantum interference device magnetometer. https://doi.org/10.1063/1.4972249

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