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Magnetoelastic Effects in Doubly Clamped Electroplated Co77Fe23 Microbeam Resonators

Physical Review Applied

Staruch, M.; Bennett, S.P.; Matis, B.R.; Baldwin, J.W.; Bussmann, K.; Gopman, D.B.; Kabanov, Y.; Lau, J.W.; Shull, R.D.; Langlois, Eric; Arrington, Christian L.; Pillars, Jamin R.; Finkel, P.

Magnetostrictive Co77Fe23 films are fully suspended to produce free-standing, clamped-clamped, microbeam resonators. A negative or positive shift in the resonant frequency is observed for magnetic fields applied parallel or perpendicular to the length of the beam, respectively, confirming the magnetoelastic nature of the shift. Notably, the resonance shifts linearly with higher-bias fields oriented perpendicular to the beam's length. Domain imaging elucidates the distinction in the reversal processes along the easy and hard axes. Together, these results suggest that through modification of the magnetic anisotropy, the frequency shift and angular dependence can be tuned, producing highly magnetic-field-sensitive resonators.

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TYPE Journal Article YEAR 2019
DOIOSTIScopus

Magnetic Smart Tags (MaST) for Arms Control and Treaty Verification

Langlois, Eric; Pillars, Jamin R.; Monson, Todd; Arrington, Christian L.; Finnegan, Patrick S.; St John, Christopher; Smartt, Heidi A.

The ability to track nuclear material is a challenge for resiliency of complex systems, e.g., harsh environments. RF tags, frequently used in national security applications, cannot be used for technological, operational, or safety reasons. Magnetic Smart Tags (MaST) is a novel tag technology based on magnetoelastic sensing that circumvents these issues. This technology is enabled by a new, cost-effective, batch manufacturing electrochemical deposition (ECD) process. This new advancement in fabrication enables multi-frequency tags capable of providing millions of possible codes for tag identification unlike existing theft deterrent tags that can convey only a single bit of information. Magnetostrictive 70% Co: 30% Fe was developed as the base alloy comprising the magnetoelastic resonator transduction element. Saturation magnetostriction, λS, has been externally measured by the Naval Research Laboratory to be as high as 78 ppm. Description of a novel MEMS variable capacitive test structure is described for future measurements of this parameter.

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TYPE SAND Report YEAR 2016
DOIOSTI
Results 26–50 of 68
Results 26–50 of 68
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