Stress reconfigurable tunable magnetoelectric resonators as magnetic sensors

Abstract

We report a magnetoelastic effect in doubly clamped ferromagnetic magnetostrictive Metglas resonators with electrically and magnetically reconfigurable frequency response. The field-induced resonance frequency shift is due to magnetostrictive strain, which is shown to have a strong dependence on uniaxial stress. Here, we demonstrate that this magnetic field induced behavior can be used as the basis for a simple, tunable, magnetoelectric magnetic field sensor. The effect of tension on the field dependent magnetostrictive constant and the sensor sensitivity is examined, and the equivalent magnetic noise floor of such a sensor is estimated.

Giant magnetoelectric effect in nonlinear Metglas/PIN-PMN-PT multiferroic heterostructure

“…Metglas is an attractive choice for the magnetic phase component due to its high piezomagnetic coefficient d 33,m at low magnetic bias fields. 11 Very high a ME values up to 22 V/cm Oe have been obtained in composites of Metglas and PZT. 12 Furthermore, nonlinearity in d 33,m in Metglas is thought to give rise to a large nonlinear ME effect that has also been shown to be an extremely promising approach to further reduce the low-frequency noise floor of magnetic sensors, as measured using a modulation-demodulation technique.…”

“…The saturation magnetostriction of a Metglas ribbon was determined to be $24 ppm using a capacitance probe (data not shown), which is consistent with the previous reports. 11 magnetometer (VSM, Lakeshore 750). Electric field dependent magnetization (M-E) measurements were performed using a VSM and a high-voltage amplifier (Trek 20/20C-HS) at a bias magnetic field of 25 Oe.…”

Magnetostrictive stress reconfigurable thin film resonators for near direct current magnetoelectric sensors

“…However, this method does not allow for synthesis of freestanding bridges with clamped ends to be used as stress reconfigurable magnetostrictive resonators, the approach potential for passive low frequency field detection. 17 In this work we have fabricated and investigated mesoscopic scale thin film magnetoelastic sub-mm length ME fixed-fixed FeCo resonators. In the approach presented here, a shift of the fundamental bending mode frequency in these resonators was measured as a function of magnetic field and direction demonstrating high sensitivity at low frequency or near dc field.…”

“…4(b), the 1-mm beam sensitivity is $10 kHz/T, which is at least 2000Â better as compared to macroscopic ME sensors. 17 Based on experimental results and the low magnetostriction factor, we assume that the intrinsic magnetic noise b n (T/ͱHz) of the bridge is ultimately determined by the spectral density of the white noise stress level r n (Pa/ͱHz) in the vicinity of the resonant frequency f r and given by …”

Sensor Applications of Soft Magnetic Materials Based on Magneto-Impedance, Magneto-Elastic Resonance and Magneto-Electricity

“…Applications based on the ME effect are as widespread as magnetic field sensors [46,47], current sensors [48], transformers [49], microwave devices [50] and FMR resonators and filters [51,52]. The highest ME response has been reported for laminated magnetostrictive/piezoelectric polymer composites.…”