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带材非对称巨磁阻抗效应的建模及数值计算

ISSN号：1000-565X
期刊名称：《华南理工大学学报：自然科学版》
时间：0
分类：O484.43[理学—固体物理;理学—物理] O241[理学—计算数学;理学—数学]
作者机构：[1]华南理工大学材料科学与工程学院,广东广州510640, [2]华南理工大学机械与汽车工程学院,广东广州510640
相关基金：基金项目：国家自然科学基金资助项目（U0734001,50874050）;广东省科技计划项目（2004810301009,2006A11002001,20078010600007,20078010600043）;广东省自然科学基金资助项目（05300306）;广州市科技计划项目（200523-D2061,200622-130131,200622一D0121）

作者：柴秀丽[1], 曾德长[1], 刘桂雄[2], 余红雅[1], 钟喜春[1], 刘文洁[1]

关键词：非对称巨磁阻抗效应, 对角电压, 非对角电压, Landau—Lifshitz动力学方程, 传感建模, asymmetrical giant magneto-impedance effect, diagonal voltage, off-diagonal voltage, Landau-Lifshitz kinetic equation, sensing modeling

中文摘要：

非对称巨磁阻抗效应具有高灵敏度的磁场响应．对于具有内部非晶软磁层和表面结晶层的带材，其非对称巨磁阻抗效应的传感建模是个复杂问题．文中针对这一问题，采用有效偏置场描述表层和内层之间的耦合作用，通过求解Landau．Lifshitz动力学方程和线性Maxwell方程得到器件的对角和非对角电压，并计算结晶层厚度变化时的磁场特性正反向工作区间和灵敏度．计算结果与实验基本相符，表明所建模型是可靠有效的．

英文摘要：

Although the asymmetric giant magneto-impedance effect （AGMIE） is of high-sensitivity magnetic re- sponse, its sensing modeling in a ribbon with inner amorphous and outer crystalline layers still remains a complicated issue. To solve the problem, this paper establishes a model of AGMIE. In this model, the coupling between the crystalline and amorphous layers is described using the effective bias field, the diagonal and off-diagonal voltages are calculated by simultaneously solving Landau-Lifshitz kinetic equations and linear Maxwell equations, and the positive and negative working spaces of the magnetic field as well as the sensitivity of the sensor at various crystal- line layer thicknesses are thus deduced. The calculated results basically accord with the experimental ones, indica- ting that the proposed model is credible and effective.

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