Nano-Torsional Resonator Torque Magnetometry

Details Nano-Torsional Resonator Torque Magnetometry Nano-Torsional Resonator Torque Magnetometry

2009-11-13

arxiv.org/abs/0911.2517v2

Appl. Phys. Lett. 96, 072513 (2010).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages preprint, 4 figures, accepted to Appl. Phys. Letters

Scientific paper

10.1063/1.3319502

Magnetic torque is used to actuate nano-torsional resonators, which are fabricated by focused-ion-beam milling of permalloy coated silicon nitride membranes. Optical interferometry is used to measure the mechanical response of two torsion modes at resonance, which is proportional to the magnetization vector of the nanomagnetic volume. By varying the bias magnetic field, the magnetic behavior can be measured with excellent sensitivity ($\approx 10^8 \mu_B$) for single magnetic elements.

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