Low damping resonant magnetoelectric sensors

Abstract

The signal of magnetic sensors based on resonant cantilevers comprised of elastically coupled piezoelectric and magnetostrictive materials increases as the damping decreases. Here, we demonstrate that air damping which normally is suppressed by evacuation can also be substantially reduced by lowering the resonance frequency. We show that a Si-cantilever structured to include a seismic mass features a resonant magnetoelectric coupling coefficient of 1.8 kV/cmOe at 330 Hz in air

Giant magnetoelectric coupling interaction in BaTiO3/BiFeO3/BaTiO3 trilayer multiferroic heterostructures

“…The maximum ME coupling interaction has been achieved in multiferroic heterostructures with alternate ferroelectric/ferromagnetic layers. 3,4 Multiferroic material Bismuth Ferrite (BFO) exhibits simultaneous existence of room temperature antiferromagnetism (T N ¼ 643 K) and ferroelectricity (T C ¼ 1103 K). 5 It has been very well explored that solid solutions of BFO with ferroelectric perovskite material BaTiO 3 (BTO) result in improved ferroelectric and magnetic properties.…”

Theory of magnetoelectric effect in multilayer nanocomposites on a substrate: Resonant bending-mode response

“…In all calculations the FeCoBSi-AlN-Si system is used, which has been extensively investigated experimentally. [10][11][12]39 If the stoichiometry of the amorphous MS-phase is kept constant, thickness independent piezomagnetic properties are expected down to 2 nm, where magnetic interface effects set in. 40 The piezoelectric coefficients of hexagonal wurtzite structure AlN layers were found to decrease below about 500 nm layer thickness.…”

“…We focus on device structure and geometry dependent magnetoelectric effects in an effort to separate them from thin film material properties, which may advance with processing techniques. As , β 33 = 1.2710 10 V m As , ρ = 3268 kg m 3 ), 10,11,42 and Si as the substrate material (s s = 5.8810 −12 Pa −1 , ρ = 2328 kg m 3 ). Please note that although the results presented below were calculated for 5 μm thick ME nanocomposites and substrates up to 20 μm.…”

“…1). [9][10][11][12][13] The magnetoelectric effect in a nanocomposite of magnetostrictive (MS) and piezoelectric (PE) materials results (in macroscopic models) as a product of the individual material properties via stress-mediated coupling. [14][15][16][17][18] Layered composites, particles, and columns in a matrix approaches with different field orientations as excitation modes have been pursued as static or dynamic ME-sensors.…”

“…3 Particularly high sensitivities are achieved for dynamic sensors operated at resonance and enhanced by the quality factor. 15,17 Exciting recent advances besides the giant sensitivity enhancements by new materials 10,11 include in-situ exchange biasing of the magnetostrictive layers 19 and MEMS compatible manufacturing techniques on substrates (Sub). 13 In this rapidly evolving field further advances are expected by multilayer a makr@tf.uni-kiel.de Layered magnetoelectric (ME) nanocomposite of alternating magnetostrictive (MS) and piezoelectric (PE) layers on a substrate (Sub) excited in bending mode.…”