测量磁电和磁压电效应

J. Evans, S. Chapman, S. Smith, B. Howard, A. Gallegos
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引用次数: 2

摘要

作者开发了一种测试程序和电路,用于表征磁场刺激下磁电装置的电荷产生。磁电效应有两种物理形式。第一种是铁材料,如氧化铋铁(BFO),其磁性和铁电性之间表现出内部耦合。第二种是由磁性材料与压电材料机械耦合而成的复合器件。施加在复合器件上的磁场在磁性材料中产生应力,并将应力传递给压电材料。测量磁电效应的传统方法是用磁场刺激样品,同时测量样品上产生的电压。这些电压非常小,需要一个锁相放大器将信号从环境噪声中拉出来。在相同情况下的电荷测量产生更大的信号,并且可以与使用材料[1]的介电常数的电压响应相关。电荷测试与传统的电滞后测试完全类似,不同之处在于测试仪器对样品施加磁场而不是电场。主讲人将描述目前使用的测试程序,并概述未来的目标,以提高结果的准确性和灵敏度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measuring magnetoelectric and magnetopiezoelectric effects
The authors have developed a test procedure and circuits for characterizing the charge generation of a magnetoelectric device when stimulated with a magnetic field. The magnetoelectric effect comes in two physical forms. The first is from a ferroic material such as Bismuth Iron Oxide (BFO) which exhibits internal coupling between its magnetic properties and its ferroelectric properties. The second is from composite devices which are constructed by mechanically coupling a magnetic material to a piezoelectric material. A magnetic field applied to a composite device creates stress in the magnetic material which transfers the stress to the piezoelectric material. The traditional method for measuring magnetoelectric effect is to stimulate the sample with a magnetic field while measuring the voltage generated across the sample. These voltages can be so small that a lock-in amplifier is required to pull the signal out of ambient noise. Charge measurement under the same circumstances produces a much larger signal and can be related to the voltage response using the dielectric constant of the material [1]. The charge test is an exact analog to the traditional electrical hysteresis test with the exception that the test instrument applies a magnetic field to the sample instead of an electric field. The presenter will describe the test procedure as presently used and outline future objectives for improving the accuracy and sensitivity of the results.
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