Sato TJ, Okuyama D, Kimura H. Tiny adiabatic-demagnetization refrigerator for a commercial superconducting quantum interference device magnetometer.
THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016;
87:123905. [PMID:
28040960 DOI:
10.1063/1.4972249]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 12/01/2016] [Indexed: 06/06/2023]
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 diameter 8.5 mm and 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 g) 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.
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