A three-dimensional measuring method for magnetic stray fields

Abstract

Reconstruction of three-dimensional microstray magnetic fields from a set of deflection data of electron probes deflected by the Lorentz force when passing through the object magnetic field is described. A novel reconstruction technique based on the ART (algebraic reconstruction technique) iterative method for electron beam tomography is proposed. In computer simulation, the algorithm was tested with a model example of a one-turn coil, and the achievable resolution is discussed. The algorithm was also checked experimentally with a one-turn oil and a commercial magnetic head. From these results, it is shown that the proposed method is applicable to high-intensity magnetic field reconstruction problems in electron beam tomography.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>