Broadband nuclear magnetic resonance using DC SQUID amplifiers

Lusher, C. P.; Li, Junyun; Digby, M; Reed, R. P.; Cowan, Brian; Saunders, J.; Drung, D.; Schurig, T.

doi:10.1016/s0964-1807(99)00016-2

Cited by 11 publications

(1 citation statement)

References 15 publications

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“…In the preceding decades, Superconducting-Quantum Interference Devices (SQUIDs) became a new path to achieving highest signal-to noise ratios (SNRs) by virtual noiseless amplification of current signals 18,19 , outperforming the hitherto known amplifiers and LTTs. As a result, SQUIDs have been introduced to many low temperature applications such as resistance measurements [20][21][22] , SQUID NMR 23,24 , MRI 25 , ESR 26 , microcalorimetry [27][28][29] and Johnson noise thermometry 30,31 obtaining unprecedented precision. However, thus far, most of these techniques were restricted to zero or low magnetic fields, as SQUIDs are notoriously difficult to use in high magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Application of SQUIDs to low temperature and high magnetic field measurements—Ultra low noise torque magnetometry

Arnold

Naumann

Lühmann

et al. 2018

Review of Scientific Instruments

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Torque magnetometry is a key method to measure the magnetic anisotropy and quantum oscillations in metals. In order to resolve quantum oscillations in sub-millimeter sized samples, piezo-electric micro-cantilevers were introduced. In the case of strongly correlated metals with large Fermi surfaces and high cyclotron masses, magnetic torque resolving powers in excess of 10 4 are required at temperatures well below 1 K and magnetic fields beyond 10 T. Here, we present a new broadband read-out scheme for piezo-electric micro-cantilevers via Wheatstone-type resistance measurements in magnetic fields up to 15 T and temperatures down to 200 mK. By using a two-stage SQUID as null detector of a cold Wheatstone bridge, we were able to achieve a magnetic moment resolution of ∆m = 4×10 −15 J/T at maximal field and 700 mK, outperforming conventional magnetometers by at least one order of magnitude in this temperature and magnetic field range. Exemplary de Haas-van Alphen measurement of a newly grown delafossite, PdRhO 2 , were used to show the superior performance of our setup.

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