Torsional oscillator magnetometer for high magnetic fields

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

doi:10.1063/1.1147562

Torsional oscillator magnetometer for high magnetic fields

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

Physics and Astronomy (Twin Cities)

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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 language	English (US)
Pages (from-to)	4161-4166
Number of pages	6
Journal	Review of Scientific Instruments
Volume	67
Issue number	12
DOIs	https://doi.org/10.1063/1.1147562
State	Published - Dec 1996

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title = "Torsional oscillator magnetometer for high magnetic fields",

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AU - Crowell, P. A.

AU - Madouri, A.

AU - Specht, M.

AU - Chaboussant, G.

AU - Mailly, D.

AU - Lévy, L. P.

PY - 1996/12

Y1 - 1996/12

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AB - 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.

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Torsional oscillator magnetometer for high magnetic fields

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