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 (≈108μB) for single magnetic elements.
@article{arxiv.0911.2517,
title = {Nano-Torsional Resonator Torque Magnetometry},
author = {J. P. Davis and D. Vick and D. C. Fortin and J. A. J. Burgess and W. K. Hiebert and M. R. Freeman},
journal= {arXiv preprint arXiv:0911.2517},
year = {2010}
}
Comments
8 pages preprint, 4 figures, accepted to Appl. Phys. Letters