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 Gd3Ga5O12 garnet (∼2 grams) used as a magnetic refrigerant, the routinely achievable lowest temperature is ∼0.56 K. The lower detection limit for a magnetization anomaly is ∼1×10−7 emu, estimated from fluctuation of the measured magnetization. The background level is ∼5×10−5 emu below 2 K at H=100 Oe, which is largely attributable to a contaminating paramagnetic signal from the magnetic refrigerant.
@article{arxiv.1612.01376,
title = {Tiny adiabatic-demagnetization refrigerator for a commercial superconducting quantum interference device magnetometer},
author = {Taku J Sato and Daisuke Okuyama and Hideo Kimura},
journal= {arXiv preprint arXiv:1612.01376},
year = {2017}
}
Comments
8 pages, 8 figures, accepted for publication in Rev. Sci. Inst