物理学报2024，Vol.73Issue(14)：228-238,11.DOI:10.7498/aps.73.20240615
谐振型自偏置磁电换能器的建模与性能研究
Modeling and performance analysis of resonant self-biased magnetoelectric transducers
摘要
Abstract
Compared with single-phase multiferroic materials,magnetoelectric(ME)composites composed of piezoelectric and magnetostrictive materials have great ME coupling,and have received widespread attention in various application fields.The application of ME devices in wireless power transfer(WPT)is attractive due to their compactness and ability to operate at lower frequencies than conventional coils.However,traditional ME composites rely on permanent magnets or electromagnets to provide biased magnetic fields,thus leading to problems such as high noise,large size,and high cost,which significantly hinder the advancement of miniaturized and high-performance ME devices.To solve this problem,a self-biased ME laminated structure based on the magnetization grading effect is proposed in this work.Using the equivalent magnetization and nonlinear magnetostrictive constitutive relationship,a finite element simulation model for a self-biased ME transducer operating in L-T mode is constructed.The ME coupling performances without DC bias in bending vibration mode and stretching vibration mode are studied.Based on the model,the corresponding experimental samples are prepared for measurement.The measurement results are in agreement with the simulation data,thereby validating the accuracy and effectiveness of the model.The measured results show that the Metglas/Galfenol/PZT-5A structure can exhibit more significant self-biased ME effect under the stretching resonance mode than under bending resonance mode.Its ME coefficient attains a notable value of 10.7 V·cm-1·Oe-1 at 99.4 kHz,while ME power coefficient reaches 5.01 μW·Oe-2 at 97.9 kHz.Its on-load ME power coefficient can reach up to 4.62 μW·Oe-2 at 99.3 kHz without impedance matching.When an external bias magnetic field of 25 Oe is applied,these performance indexes increase significantly to 47.06 V·cm-1·Oe-1 at 99.4 kHz and 82.13 μW·Oe-2 at 99.0 kHz,respectively.The simulation results further show that the performance of the self-biased ME transducer can be significantly improved by increasing the thickness of the high permeability layer.For example,by increasing the Metglas layer thickness from 30 pm to 90 pm,both the ME coefficient and ME power coefficient increase rapidly by 2.47 times and 6.96 times the original values,respectively.Self-biased ME transducers effectively reduce the dependence on external bias magnetic field,thereby providing a good approach for applying and developing ME composites in low-frequency WPT systems.关键词
磁电换能器/自偏置磁电效应/高磁导率层/磁电功率系数Key words
magnetoelectric transducer/self-biased magnetoelectric effect/high permeability layer/magnetoelectric power coefficient引用本文复制引用
谢冰鸿,徐国凯,雷保新,肖绍球,喻忠军,朱大立..谐振型自偏置磁电换能器的建模与性能研究[J].物理学报,2024,73(14):228-238,11.基金项目
国家重点研究计划(批准号:2021YFA0716500)和国家自然科学基金(批准号:62171487)资助的课题. Project supported by the National Key Research and Development Program of China(Grant No.2021YFA0716500)and the National Natural Science Foundation of China(Grant No.62171487). （批准号:2021YFA0716500）
