The advantages of the thin magnetic layer of a metal particulate tape

Author

Inaba, Hiroo ; Ejiri, Kiyomi ; Abe, Naoto ; Masaki, Kouichi ; Araki, Hiroaki

Author_Institution

Fuji Photo Film Co. Ltd., Kanagawa, Japan

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3607

Lastpage

3612

Abstract

A very thin and smooth magnetic coating of metal particulate (MP) tape is made possible by the dual coating method. This MP tape consists of a magnetic upper layer and a nonmagnetic underlayer composed of very fine (TiO₂) powder. The anticipated advantages of decreasing the thickness of the magnetic layer were observed. The Hc, Hr, and squareness increased as the thickness of the magnetic layer decreased. Thinning the layer to thicknesses below 0.3 μm increased the reproduced output by 1.5 dB and achieved the same value as the Hi-8 metal evaporated (ME) tape. The loss of the magnetic moment density under conditions of 60°C 90% RH is independent of the thickness of the magnetic layer. Although the thickness of this thin MP layer was the same as that of the HI-8 ME, the electromagnetic characteristics were different from those of the ME

Keywords

iron compounds; magnetic moments; magnetic properties of fine particles; magnetic recording; magnetic tapes; powders; titanium compounds; 0.3 micron; 60 degC; Fe₂O₃; TiO₂; dual coating method; electromagnetic characteristics; magnetic moment density; magnetic upper layer; metal particulate tape; nonmagnetic underlayer; powder; recording; smooth magnetic coating; thin magnetic layer; Chromium; Coatings; Demagnetization; Digital recording; Iron; Magnetic properties; Powders; Research and development; Rough surfaces; Surface roughness;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281245

Filename

281245