用修正偶极模型来理解磁铁的磁感应强度变化规律
Understanding Variations in Magnetic Induction Intensity of Magnets Using the Modified Dipole Model
魏陆军 1王增旭1
作者信息
- 1. 南京邮电大学 理学院,江苏 南京 210023
- 折叠
摘要
利用巨磁电阻传感器进行了磁电转换特性的测量,得到了输出电压与磁感应强度(UOUT-B)呈线性关系的区间.用此传感器分别测定了条形磁铁"N"极的中垂线上和马蹄形磁铁的蹄口中线方向上的磁感应强度.随后绘制并分析了B与x(位置)的曲线图,发现利用磁偶极子模型(B～x-3)不能对其进行很好地拟合.采用修正后的磁偶极子模型,即把磁铁看成若干个磁偶极子推导的方程,可以更好地拟合数据,并能合理的解释.
Abstract
Measurements of the magnetoelectric conversion characteristics were carried out using a giant magnetoresistive(GMR)sensor,and the interval of linear relation between the output voltage and the magnetic induction intensity(UOUT-B)was obtained.The magnetic induction intensity on the mid-plumb line of the N-pole of the bar magnet and in the direction of the midline of the hoof opening of the horseshoe magnet were determined using a GMR sensor.Subsequently,a plot of B versus x(position)was plotted and it was found that it could not be fitted well using the magnetic dipole model(B～x-3).Therefore,a modified magnetic dipole model,i.e.,an equation derived by considering the magnet as a number of magnetic dipoles,was used to fit the data better,and can be reasonably explained.
关键词
GMR传感器/磁电转换/磁铁/磁偶极子模型Key words
GMR sensor/magnetoelectric conversion/magnet/magnetic dipole model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据