Reconstruction of magnetic fields by reflection electron beam tomography

Author

Nomizu, S. ; Yin, J. ; Nakano, Y. ; Ogawa, Koichi ; Matsuda, J.

Author_Institution

Fac. of Eng., Nagaoka Univ. of Technol., Niigata, Japan

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4926

Lastpage

4928

Abstract

A new method for measuring the three-dimensional magnetic stray fields extending beyond a magnetic head is presented. The electron beams are injected to the head surface, and the positions of the reflected electron beams are measured at the detecting plane placed above, and in parallel with, the head surface. The three-dimensional magnetic fields are reconstructed using an algebraic reconstruction technique (ART) algorithm from the deflection vectors of the reflection electron beams which are deflected by the magnetic fields. Our measurement system was applied to the measurement of the field distribution of an erasing head for a video cassette recorder. From these results, the applicability of our method for measuring magnetic stray field distribution near the head surface is clarified

Keywords

computerised tomography; electron beam applications; magnetic field measurement; magnetic heads; tomography; video tape recorders; algebraic reconstruction technique algorithm; electron beam injection; erasing head field distribution; head surface fields; magnetic field reconstruction; magnetic head; reflection electron beam deflection vectors; reflection electron beam tomography; three-dimensional magnetic stray field measurement; video cassette recorder; Control systems; Digital control; Electron beams; Magnetic field measurement; Magnetic fields; Magnetic heads; Optical reflection; Scanning electron microscopy; Surface reconstruction; Tomography;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539290

Filename

539290