Examination of Precise Measurement of DC Magnetic Properties of Permalloy Under Low Flux Density More Than a Few mT

Author

Mimura, M. ; Takahashi, N. ; Nakano, M. ; Ujigawa, S. ; Shinnoh, T. ; Miyagi, D.

Author_Institution

Dept. Electr. & Electron. Eng., Okayama Univ., Okayama, Japan

Volume

48

Issue

11

fYear

2012

Firstpage

3614

Lastpage

3617

Abstract

Permalloy is used in a magnetically shielded room to inhibit the penetration of external magnetic field, etc. The flux density in permalloy used in the shielded room is of the order of a few mT or lower. In order to examine the performance of such a shielded room, the dc magnetic properties at low flux density is necessary. In this paper, we developed a measurement method of dc (5 mHz) magnetic properties of permalloy under such a low flux density. It is shown that the dc magnetic properties could be measured more than 4 mT by paying the attention to the degaussing of specimen and applying the correction of drift and offset of measurement system.

Keywords

Permalloy; magnetic field effects; magnetic field measurement; magnetic flux; magnetic shielding; DC magnetic properties; external magnetic field; low flux density; magnetically shielded room; permalloy; precise measurement; specimen degaussing; Current measurement; Density measurement; Frequency measurement; Magnetic flux; Magnetic hysteresis; Magnetic noise; Magnetic shielding; DC magnetic property; low flux density; permalloy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2012.2199471

Filename

6332951