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Antonio, D.; Dolz, M.I.; Pastoriza, H. |
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Title |
Micromechanical magnetometer using an all-silicon nonlinear torsional resonator |
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Journal Article |
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Year |
2009 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
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Volume |
95 |
Issue |
13 |
Pages |
133505-3 |
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Keywords |
damping; eddy currents; elemental semiconductors; magnetometers; micromechanical devices; nonlinear dynamical systems; oscillations; Q-factor; resonators; silicon |
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Abstract |
In this work, a micromagnetometer employing a nonlinear torsional resonator with a high quality factor Q is presented experimentally. Oscillatory rotation of a conducting plate in the sensed magnetic field H induces eddy currents that dissipate energy. Due to the nonlinear response of the oscillator, the resulting mechanical damping originates frequency shifts in the resonance curve that depend on H. Nonlinearity results from the electrostatic detection, which introduces high order electrical spring constants. The device is fabricated with a standard silicon process and does not incorporate ferromagnetic materials. An analytical nonlinear model that correctly describes the device is also introduced. |
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AIP |
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BT @ hernan @ |
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564 |
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Author |
Luzuriaga, J. |
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Title |
Measurements in the laminar and turbulent regime of superfluid4He by means of an oscillating sphere |
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Journal Article |
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Year |
1997 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
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108 |
Issue |
3-4 |
Pages |
267-277 |
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Keywords |
Calculations; Laminar flow; Oscillations; Spheres; Turbulence; Turbulent flow; Vibrations (mechanical); Oscillating sphere; Translational oscillation; Superfluid helium |
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Abstract |
The translational oscillations of a sphere in liquid helium have been measured as a way of studying superfluid turbulence. Experiments were carried out in the laminar flow regime for reference purposes, and good agreement found between measured and calculated quantities. In the turbulent region, the dissipation is found to be proportional to the square of the velocity of the sphere, as found previously by other workers. For high vibration amplitudes there is an increase in the hydrodynamic mass. This seems to scale with the superfluid fraction in a way that strongly suggests that the superfluid component plays an important role in the turbulent regime. |
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Comisi |
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00222291 (ISSN) |
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Cited By (since 1996): 2; Export Date: 28 April 2009; Source: Scopus; CODEN: JLTPA; Language of Original Document: English; Correspondence Address: Luzuriaga, J.; Comisi |
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BT @ luzuriag @ |
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518 |
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