Demagnetization of Co-Cr films induced by stress and heat

Author

Hoshi, Y. ; Matsuoka, M. ; Naoe, M. ; Yamanaka, S.

Author_Institution

Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan.

Volume

20

Issue

5

fYear

1984

fDate

9/1/1984 12:00:00 AM

Firstpage

797

Lastpage

799

Abstract

Stress and heat induced demagnetization of Co-Cr films with perpendicular magnetic anisotropy deposited on 50 μm thick polyimide base films has been studied. The loss in remanent magnetization Mrwas detected with a vibrating sample magnetometer VSM after the film had been stressed or heated. Mrdecreases monotonically to about half, as stress increases to 4 × 10⁹dyn/cm². Such loss in ramanence $\\delta M_{r}$ with stress, however, decreases as perpendicular magnetic anisotropy field $H_{k\\perp }$ or film thickness increases. $\\delta M_{r}$ can also be reduced by using double layer medium with soft magnetic layer. These results suggest that the higher $H_{k\\perp }$ and better orientation of the magnetic vector to the c-axis lead to the smaller demagnetization. Heating the films in its remanent state also leads a decrease in the remanence. Mrreduces below 85 % by heating to a temperature of 150°C. This loss in Mr is mainly due to the decrease in perpendicular magnetic anisotropy energy.

Keywords

Magnetic anisotropy; Magnetic recording/recording materials; Magnetic thermal factors; Mechanical factors; Demagnetization; Heating; Magnetic anisotropy; Magnetic films; Magnetic losses; Magnetization; Perpendicular magnetic anisotropy; Polyimides; Soft magnetic materials; Stress;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1984.1063360

Filename

1063360