Novel Magnetic Field Modulation Concept Using Multiferroic Heterostructure for Magnetoresistive Sensors

Abstract

The low frequency magnetic field detection ability of magnetoresistive (MR)sensor is seriously affected by 1/f noise. At present, the method to suppress the influence of low frequency noise is mainly to modulate the measured magnetic field by mechanical resonance. In this paper, a novel modulation concept employing a magnetoelectric coupling effect is proposed. A design method of modulation structure based on an equivalent magnetic circuit model (EMCM) and a single domain model of in-plane moment was established. An EMCM was established to examine the relationship between the permeability of flux modulation film (FMF) and modulation efficiency, which was further verified through a finite element simulation model (FESM). Then, the permeability modulated by the voltage of a ferroelectric/ferromagnetic (FE/FM) multiferroic heterostructure was theoretically studied. Combining these studies, the modulation structure and the material were further optimized, and a FeSiBPC/PMN-PT sample was prepared. Experimental results show that the actual magnetic susceptibility modulation ability of FeSiBPC/PMN-PT reached 150 times, and is in good agreement with the theoretical prediction. A theoretical modulation efficiency higher than 73% driven by a voltage of 10 V in FeSiBPC/PMN-PT can be obtained. These studies show a new concept for magnetoelectric coupling application, and establish a new method for magnetic field modulation with a multiferroic heterostructure.

Design and Optimization of a BAW Magnetic Sensor Based on Magnetoelectric Coupling

“…Martos et al proposed a circuit simulation model of a novel miniaturized magnetoelectric antenna which is applied in low-power sensing [20]. However, there is little systematic research on the material, structure, and device simulation and performance optimization of the micro-magnetic sensor based on BAW actuation yet [21][22][23].…”

High Resolution Magnetoelectric Sensor and Low-frequency Measurement using Frequency up-conversion Technique

“…The frequency shifts from the main peak are ± , respectively, and the peak height was proportional to the measured magnetic field. After magnetic field calibration, the magnitude of the measured low frequency weak magnetic field signal can be obtained via measuring the height of the shoulder peaks [30][31][32][33]. In general, the limit of detection (LOD) depends on the dimension of ME sensor and the operating frequency, and the LOD for the thin-film sensor is better than that of bulk one, and the LOD for AC field is smaller than that for DC one as well.…”

Ferroelectricity and Ferromagnetism Achieved via Adjusting Dimensionality in BiFeO3/BiMnO3 Superlattices

“…Recently, multiferroic materials exhibit a wide range of potential applications in multifunctional devices, such as memory devices, 1,2 sensors, 3,4 and so forth. However, regarding all the important ABO 3 perovskite oxide families, a single-phase material that presents strong polarization and magnetization simultaneously at room temperature (RT) is rare.…”

“…Recently, multiferroic materials exhibit a wide range of potential applications in multifunctional devices, such as memory devices, , sensors, , and so forth. However, regarding all the important ABO 3 perovskite oxide families, a single-phase material that presents strong polarization and magnetization simultaneously at room temperature (RT) is rare. , Fortunately, artificial oxide superlattices (SLs) present intriguing opportunities for integrating multifunction in a system, especially in ferroelectricity and ferromagnetism. − Moreover, the potential coupling of spontaneous polarization and magnetic moment at the interfaces of ferroelectric layers and FM layers in such a superlattice system tends to be fascinating. , As the robust RT multiferroics, BiFeO 3 (BFO) is actually AFM, which limits its applications. − Among the other most promising materials, it is worth noting that BiMnO 3 (BMO) exhibits a magnetic moment of about 3.6 μB/Mn with a FM transition temperature T C of about 105 K. , Interestingly, epitaxial BMO films sometimes are believed to be weak ferroelectricity, although its paraelectric character in bulk with the C 2/ c space group is accepted. − …”