Electrode position optimization in magnetoelectric sensors based on magnetostrictive-piezoelectric bilayers on cantilever substrates

Bala, Uzzal Binit; Krantz, Matthias C.; Gerken, Martina

doi:10.1109/tuffc.2014.2924

Cited by 5 publications

(3 citation statements)

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“…Due to the resonant bending, highest potentials are induced close to the clamped end of the cantilever and vanishing at the tip. The electric potential is averaged because of the electrode's conductivity and thus highest ME coefficients occur for small electrode lengths located close to the clamping with large piezoelectric layer thicknesses [9]. The corresponding short-circuit ME coefficient in Figure 3 (b) shows completely different behaviour with highest ME coefficients for largest electrode length and vanishing piezoelectric layer thickness.…”

Section: Finite Element Methods Resultsmentioning

confidence: 98%

“…It has been shown that the output signal can be enhanced by using magnetic flux concentrators [3]- [5], preventing air damping [6] and the use of optimized layer thicknesses and sequences [7], [8]. Furthermore, we have shown that the use of pick-up regions can further increase the electric potential [9]. However, beside the ME sensor's output signal the intrinsic noise level and lownoise amplifiers are of prime importance to measure small AC magnetic fields, for example in biomedical applications [10]- [12].…”

Section: Introductionmentioning

confidence: 87%

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Signal-to-Noise Ratio in Cantilever Magnetoelectric Sensors

et al. 2016

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The signal-to-noise ratio (SNR) is investigated for compound magnetoelectric (ME) sensors on cantilever substrates for detection of low-level magnetic fields. Operated at the mechanical resonance, the magnetic field deforming the magnetostrictive (MS) layer causes a resonant bending mode response in the ME cantilever. The deformation of the piezoelectric (PE) layer allows for extraction of a voltage or charge signal. Here, the influence of the piezoelectric layer thickness and electrode length on the SNR is evaluated in a theoretical study. The signal levels are calculated using the finite element method (FEM). Noise voltages are calculated including the intrinsic electric noise of the ME sensor and amplifier noise for the case of a voltage amplifier and a charge amplifier. AlN and PZT are considered as piezoelectric materials. For a cantilever geometry with 10 mm length, 10 mm width, 300 µm thick silicon substrate, and a Metglas magnetostrictive layer of 2 µm thickness a limit of detection (LOD) in the pT-range is predicted for 2 µm thick AlN layers, while the LOD of PZT ME sensors is approximately one order of magnitude worse. A doubling of the SNR is obtained for choosing an upper electrode covering only the fixed side of the cantilever. Operation with a charge amplifier shows at least ∼50 % better SNR values compared to piezoelectric voltage amplification.Index Terms-Finite element method, magnetoelectric (ME) sensors, magnetic field measurement, magnetostrictive device, noise.

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Section: Finite Element Methods Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 87%

Signal-to-Noise Ratio in Cantilever Magnetoelectric Sensors

et al. 2016

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“…This suggests that electrodes should only be deposited at the positions with higher ME response. 15,16 Nevertheless, few studies have reported circuit optimization of the electrodes on a single laminate. Based on these facts, PZT/Ni cylindrical layered ME composites with quartering electroplated Ni arc layers, which also serve as the positive electrodes, were designed.…”

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confidence: 99%

Multi-electrode Pb(Zr,TiO)3/Ni cylindrical layered magnetoelectric composite

Pan

Zuo

et al. 2015

Applied Physics Letters

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Resonance magnetoelectric effect in Ni/Pb(Zr,Ti)O3/Terfenol-D trilayered composites with different mechanical boundary conditions Appl. Phys. Lett. 104, 252411 (2014); 10.1063/1.4885515 Giant magnetoelectric effect in mechanically mediated composite structure of TbFe2 alloy and Pb(Zr,Ti)O3 ceramicsMulti-electrode Pb(Zr,TiO) 3 /Ni cylindrical layered magnetoelectric (ME) composites were made by electroplating. The electroplated Ni layers were arrayed as four arcs on the inner PZT cylinder surface. The axial ME voltage coefficient of the composites was studied. Due to the cylinder symmetry, each of the four units of the PZT/Ni cylinder showed the same ME voltage response as the whole cylindrical ME composite, or when connected in parallel. When the four units were connected in series, the ME voltage was improved about three times than the single unit. This optimization is promising for the miniaturized ME devices design. V C 2015 AIP Publishing LLC.

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