基于微磁学分析的缺陷微磁检测机理研究

Research on Micro-magnetic Detecting Mechanism of Defect Based on Micro-magnetics Analysis

缺陷对铁磁材料内部磁畴壁的钉扎使得缺陷附近出现不依赖于外部磁场变化的微磁固定结点。针对该现象,从微磁学理论计算出发,通过能量最小原理分析了缺陷附近内部能量的变化,得出了缺陷附近微磁固定结点内磁化场的奇异分布,根据其分布特征实现了缺陷检测。

The micro--magnetic fixed knot which did not depend on the outer magnetic field formed near the defects, because the domain wall in the ferro--magnets was pinned by the defects. The singular distribution of magnetizing field in the micro--magnetic fixed knot near the defects was calculated by the method of minimum energy form micro--magnetics analysis. Defect detection can be realized according to the distribution characteristics and what proposed herein provides a theoretical basis for defect micro--magnetic defection.