权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of measuring method for the three-dimensional high frequency micro-magnetic stray fields extending beyond a magnetic head by reflection electron tomography

反射电子断层扫描磁头外三维高频微磁杂散场测量方法的研制

基本信息

批准号：
05555112
负责人：
MATSUDA Jinichi
金额：
$ 7.68万
依托单位：
NAGAOKA UNIVERSITY OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

A new method for measuring the three-dimensional high frequency micro-magnetic stray fields extending beyond a magnetic head by reflection electron tomography are developed. This method is based on tomographic technique, in which the magnetic fields are reconstructed from the deflection vectors of the electron beams deflected by the Lorentz force when traversing through magnetic fields. In this method, the electron beams are injected at right angles to the surface of a specimen, while scanning their injection positions regularly, and the resulting deflection vectors of the electron beams traversing through the magnetic fields and being reflected from the surface of the specimen are measured. From these data, the three-dimensional magnetic stray fields extending over in this region are iteratively reconstructed by an ART method (Algebraic Reconstruction Technique) using the BEM (Boundary Element Method) for calculating the magnetic field distribution. Our proposed method is tested with a known magnetic field model of one-turn coil by computer simulation.It is shown numerically that the field distribution just beyond the specimen can be evaluated three dimensional with an error of around 20 %. And from these experimental results, it is confirmed that our method can be applicable to the measurement of micro-magnetic stray fields just beyond the gap region.

提出了一种利用反射电子层析成像技术测量磁头外三维高频微磁杂散场的新方法。该方法是基于层析成像技术，其中的磁场重建由洛伦兹力偏转的电子束穿过磁场时的偏转矢量。在该方法中，电子束以直角注入到样品的表面，同时定期扫描它们的注入位置，并且测量穿过磁场并从样品的表面反射的电子束的所得偏转矢量。根据这些数据，通过使用BEM（边界元法）的ART方法（代数重建技术）迭代地重建在该区域中延伸的三维磁杂散场，以计算磁场分布。用一个已知的单匝线圈磁场模型进行了计算机模拟，结果表明，该方法可以计算出样品外的三维磁场分布，误差在20%左右。实验结果表明，该方法可用于测量差距以外的微小杂散磁场。