Abstract
We investigated the magnetoelectric properties of a new laminate composite material based on y + 140°-cut congruent lithium niobate piezoelectric plates with an antiparallel polarized “head-to-head” bidomain structure and metglas used as a magnetostrictive layer. A series of bidomain lithium niobate crystals were prepared by annealing under conditions of Li2O outdiffusion from LiNbO3 with a resultant growth of an inversion domain. The measured quasi-static magnetoelectric coupling coefficient achieved |αE31| = 1.9 V·(cm Oe)−1. At a bending resonance frequency of 6862 Hz, we found a giant |αE31| value up to 1704 V·(cm Oe)−1. Furthermore, the equivalent magnetic noise spectral density of the investigated composite material was only 92 fT/Hz1/2, a record value for such a low operation frequency. The magnetic-field detection limit of the laminated composite was found to be as low as 200 fT in direct measurements without any additional shielding from external noises.
Highlights
Composite magnetoelectric (ME) materials have gained great interest in recent years because of their possible applications in ultra-sensitive magnetic sensors, energy harvesters, low power consumption memory devices, microwave phase shifters, gyrators, etc. [1,2,3,4,5,6]
In our research we are focused on low-frequency, ultra-sensitive magnetic field sensors with the aim of using them in biomedicine, e.g., in magnetoencephalography and magnetocardiography [2,7,8]
Magnetic field sensors based on composite multiferroics cannot fully replace SQUIDs capable of detecting single magnetic flux quanta
Summary
Composite magnetoelectric (ME) materials have gained great interest in recent years because of their possible applications in ultra-sensitive magnetic sensors, energy harvesters, low power consumption memory devices, microwave phase shifters, gyrators, etc. [1,2,3,4,5,6]. The best equivalent magnetic noise spectral density (EMND) value for ME sensors based on simple ME 2-2 laminate composites containing mechanically coupled magnetostrictive (MS) and piezoelectric (PE) layers [9] reported in the literature are of the order of 1 pT/Hz1/2 for an operation frequency of 10 Hz [10,11,12].
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