Ageing effects of metal evaporated tapes

Author

Fischer, G. ; Richter, H.J. ; Schildberg, H.P. ; Hibst, H.

Author_Institution

BASF AG, Ludwigshafen, Germany

Volume

29

Issue

6

fYear

1993

fDate

11/1/1993 12:00:00 AM

Firstpage

3757

Lastpage

3759

Abstract

The ageing effects of metal evaporated (ME) tapes stored under different temperature and humidity conditions are investigated. The observed increase of the longitudinal coercivity measured parallel to the running direction of the tape with a vibrating sample magnetometer can in all cases be described by an exponential law. Whereas the extent of the H_c-increase is mainly determined by the storage humidity, the speed of the ageing is dominated by the storage temperature. The output level of the ME tape measured with a video ring head is not deteriorated by the climate storage. As the ageing behavior is not at all influenced even by very thick (100 nm) C or Cr protective layers it is concluded that the physical process causing the ageing consists in the oxidizing influence of evaporants from the PET substrate foil on the magnetic material

Keywords

ageing; coercive force; environmental degradation; magnetic recording; magnetic tapes; oxidation; evaporants; longitudinal coercivity; magnetic recording characteristics; metal evaporated tapes; output level; oxidizing influence; polyethylene terephthalate substrate; storage humidity; storage temperature; Aging; Chromium; Coercive force; Humidity; Magnetic heads; Magnetometers; Positron emission tomography; Protection; Temperature; Vibration measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.281293

Filename

281293