Torsional oscillator magnetometer for high magnetic fields

P. A. Crowell, A. Madouri, M. Specht, G. Chaboussant, D. Mailly, L. P. Lévy

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We have designed and constructed a torsional oscillator magnetometer for use in magnetic fields up to 25 T. The anisotropic component of the magnetization is detected by measuring the shift in the resonant frequency of the oscillator, which is fabricated from a single-crystal silicon wafer using micromachining techniques. The frequencies for the oscillators described here are between 100 Hz and 1 kHz and can be measured with a resolution of order 1 part in 108 in a 10 s averaging time, allowing for the detection of magnetic moments of 2×10-11 J/T at 1 T. Our oscillators are optimized for experiments on GaAs-AlGaAs heterostructures, but the method is suitable for any sample with an anisotropic susceptibility. We have applied the technique to two systems, a quasi-one-dimensional spin chain and a two-dimensional electron gas.

Original languageEnglish (US)
Pages (from-to)4161-4166
Number of pages6
JournalReview of Scientific Instruments
Volume67
Issue number12
DOIs
StatePublished - Dec 1996

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