Large non-saturating shift of the torsional resonance in a doubly clamped magnetoelastic resonator
Abstract
The magnetic field dependence of the resonance frequencies of Co1−xFex thin film microfabricated resonators was examined for fields applied in the plane of the film. Remarkably, the observed resonance frequency shift with an applied magnetic field did not saturate even up to fields of nearly 2 T. A minimized mechanical and magnetic free energy model of clamped–clamped resonators revealed that for a two-dimensional structure, both bending and torsional modes are allowed, but would have have very different resonance shift behavior with the applied field. A post-anneal of the structure confirms this case by increasing the stress-induced anisotropy of CoFe, which selectively enhances the contribution of the torsional mode and creates the non-saturating field-induced frequency shift. By using the resonance shift in this device in a potential magnetic field sensing paradigm, such a non-saturating torsional mode may be useful for applications such as nuclear magnetic resonance or MRI, which specifically requires sensitive detection of small fluctuations in high magnetic fields.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 08, 2020
- Source ID
- 10.1063/5.0010975
Entities
People
- Bernard R Matis
- Jeffrey W. Baldwin
- K. Bussmann
- Margo Staruch
- Olaf van 't Erve
- Peter Finkel
- Samuel E. Lofland
- Steven P. Bennett
Organizations
- Office of Naval Research
- Rowan University
- United States Naval Research Laboratory