Magneto-electric interactions at bending resonance in an asymmetric multiferroic composite: Theory and experiment on the influence of electrode position

Sreenivasulu, G.; Qu, Peng; Петров, В. М.; Qu, Hongwei; Srinivasan, G.

doi:10.1063/1.4919818

Cited by 13 publications

(12 citation statements)

References 22 publications

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“…With a further increase in f, the MEVC decreases rapidly and levels off at ~10 V/cm·Oe for f > 47 Hz. The peak in MEVC is associated with the bending resonance in the bimorph with the proof mass [ 20 ]. Similar resonances in MEVC are reported for bending modes and longitudinal and thickness acoustic resonance in ferromagnetic-piezoelectric composites [ 7 , 8 , 9 , 10 ].…”

Section: Resultsmentioning

confidence: 99%

“…The interaction between the AC magnetic field along direction 1 and remnant magnetization of the magnet along direction 3 gives rise to a piezoelectric strain in PZT. Based on equations of bending vibrations [ 20 , 25 ], the general expression for displacement w in z direction perpendicular to the sample plane can written as: u=C 1 sinh(kx)+C 2 cosh(kx)+C 3 sin(kx)+C 4 cos(kx) …”

Section: Theory and Discussionmentioning

confidence: 99%

“…The ME voltage generated across the thickness of the bimorph was measured with a signal analyzer (Stanford Research Systems, model SR780). Since the ME voltage across PZT is non-uniform along the length of the bimorph, we measured the ME voltage V close to the clamped end where one expects maximum value [ 20 ]. The ME sensitivity S = V/H and the ME voltage coefficient MEVC = S/t ( t is the PZT thickness) were measured as a function of frequency and at room temperature.…”

Section: Methodsmentioning

confidence: 99%

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Sensitivity Enhancement in Magnetic Sensors Based on Ferroelectric-Bimorphs and Multiferroic Composites

Sreenivasulu

Петров

et al. 2016

Sensors

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Multiferroic composites with ferromagnetic and ferroelectric phases have been studied in recent years for use as sensors of AC and DC magnetic fields. Their operation is based on magneto-electric (ME) coupling between the electric and magnetic subsystems and is mediated by mechanical strain. Such sensors for AC magnetic fields require a bias magnetic field to achieve pT-sensitivity. Novel magnetic sensors with a permanent magnet proof mass, either on a ferroelectric bimorph or a ferromagnetic-ferroelectric composite, are discussed. In both types, the interaction between the applied AC magnetic field and remnant magnetization of the magnet results in a mechanical strain and a voltage response in the ferroelectric. Our studies have been performed on sensors with a Nd-Fe-B permanent magnet proof mass on (i) a bimorph of oppositely-poled lead zirconate titanate (PZT) platelets and (ii) a layered multiferroic composite of PZT-Metglas-Ni. The sensors have been characterized in terms of sensitivity and equivalent magnetic noise N. Noise N in both type of sensors is on the order of 200 pT/√Hz at 1 Hz, a factor of 10 improvement compared to multiferroic sensors without a proof mass. When the AC magnetic field is applied at the bending resonance for the bimorph, the measured N ≈ 700 pT/√Hz. We discuss models based on magneto-electro-mechanical coupling at low frequency and bending resonance in the sensors and theoretical estimates of ME voltage coefficients are in very good agreement with the data.

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Section: Resultsmentioning

confidence: 99%

Section: Theory and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Sensitivity Enhancement in Magnetic Sensors Based on Ferroelectric-Bimorphs and Multiferroic Composites

Sreenivasulu

Петров

et al. 2016

Sensors

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“…The ME voltage generated across the thickness of the bimorph was measured with a signal analyzer (Stanford Research Systems, model SR780). Since the ME voltage across PZT is nonuniform along the length of the bimorph, we measured the ME voltage V close to the clamped end where one expects maximum value [8]. The ME sensitivity S = V/H and the ME voltage coefficient MEVC = S/t (t is the bimorph thickness) were measured as a function of frequency and at room temperature.…”

Section: Methodsmentioning

confidence: 99%

A pico-Tesla magnetic sensor with PZT bimorph and permanent magnet proof mass

Srinivasan¹,

Sreenivasulu²,

et al. 2015

2015 9th International Conference on Sensing Technology (ICST)

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Abstract-Ferromagnetic-ferroelectric composites have attracted interests in recent years for use as magnetic field sensors. The sensing is based on magneto-electric (ME) coupling between the electric and magnetic subsystems and is mediated by mechanical strain. Such sensors for ac magnetic fields require a bias magnetic field to achieve pT-sensitivity. Here we discuss measurements and theory for a novel ac magnetic sensor that does not require a bias magnetic field and is based on a PZT bimorph with a permanent magnet proof mass. Mechanical strain on the PZT bimorph in this case is produced by interaction between the applied ac magnetic field and remnant magnetization of the permanent magnet, resulting in an induced voltage across PZT. Our studies have been performed on sensors with a bimorph of oppositely poled PZT platelets and a NdFeB permanent magnet proof mass. Magnetic floor noise N on the order of 100 pT/√Hz and 10 nT/√Hz are measured at 1 Hz and 10 Hz, respectively. When the ac magnetic field is applied at the bending resonance of ~ 40 Hz for the bimorph, the measured N ~ 700 pT/√Hz. We also discuss a theory for the magneto-electromechanical coupling at low frequency and bending resonance in the sensor and theoretical estimates of ME voltage coefficients are in very good agreement with the data.

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“…5 To improve the performance of multiferroic materials in these applications, researchers have been making efforts to increase the ME coefficient in both single phase and composite multiferroics. [6][7][8][9] Recently, a relatively high ME coefficient of 20 kV/(cm Oe) was reported by Kirchhof et al for a device based on FeBSiC/AlN heterostructure that was operated at a resonance frequency of 152 Hz. 10 For resonant ME devices, it is often desirable to obtain a high mechanical quality factor, as this enhances the ME coefficient.…”

mentioning

confidence: 97%