A perpendicular orientation of a coated particulate medium by an AC-demagnetization process

Author

Ohtsubo, A. ; Satoh, Y. ; Masuko, T. ; Hirama, M. ; Abe, E. ; Masuko, T. ; Hirama, M. ; Abe, Eisuke

Author_Institution

Yamagata University, Yonezawa, Yamagata, Japan

Volume

20

Issue

5

fYear

1984

fDate

9/1/1984 12:00:00 AM

Firstpage

751

Lastpage

753

Abstract

A new perpendicular magnetic orientation method for coated particulate medium has been studied in order to resolve two problems : "self-demagnetization accompanying re-disorientation" of particles and "surface roughening" in conventional DC orientation method applied to coating a particulate medium in a low viscous state. These two phenomena are discussed in terms of a stabilization of magnetization energy in a perpendicular demagnetization field. AC demagnetization is used to erase residual magnetization just after AC magnetic orientation. For these two purposes a magnet is used which has a pair of pole pieces with graded edges and is operated at 50 Hz. CrO2particles in coated medium were perpendicularly oriented by this method. Achievement of the orientation is evident from magnetic measurements : $Hc\\perp =700$ Oe, $Hc // = 600$ Oe, $O. R. \\perp =3.22$ , $O. R. \\parallel$ =0.71, and from high

Keywords

Anisotropic magnetoresistance; Coatings; Demagnetization; Magnetic anisotropy; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Rough surfaces; Saturation magnetization; Shape; Surface roughness;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1984.1063395

Filename

1063395