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Magnetoelastic Effects in Doubly Clamped Electroplated Co77Fe23 Microbeam Resonators
M Staruch1, S P Bennett1, B R Matis1
1U.S. Naval Research Laboratory, Washington, D.C. 20375, USA.
Physical Review Applied
|November 27, 2020
Summary
Researchers developed novel magnetostrictive resonators from cobalt-iron films. These devices exhibit tunable frequency shifts in response to magnetic fields, enabling highly sensitive magnetic field detection.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Magnetostrictive materials offer unique magnetomechanical coupling properties.
- Micro-resonators are sensitive devices for various sensing applications.
- Controlling magnetic anisotropy is key to tuning material response.
Purpose of the Study:
- To fabricate and characterize free-standing magnetostrictive microbeam resonators.
- To investigate the magnetoelastic effect on resonant frequency shifts.
- To explore the tunability of magnetic anisotropy for enhanced magnetic field sensitivity.
Main Methods:
- Fabrication of free-standing, clamped-clamped magnetostrictive cobalt-iron (Co77Fe23) microbeam resonators.
- Application of external magnetic fields parallel and perpendicular to the beam length.
- Resonant frequency measurement and analysis.
- Magnetic domain imaging using advanced microscopy techniques.
Main Results:
- Observed distinct resonant frequency shifts (negative/positive) based on magnetic field orientation.
- Demonstrated a linear relationship between resonance shift and perpendicular bias magnetic fields.
- Elucidated differences in magnetic reversal processes along easy and hard axes via domain imaging.
Conclusions:
- The magnetoelastic nature of the frequency shift was confirmed.
- Modification of magnetic anisotropy allows tuning of frequency shift and angular dependence.
- These resonators show potential for highly sensitive magnetic field sensing applications.
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