Demagnetization of Co-Cr films induced by stress and heat

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 with stress, however, decreases as perpendicular magnetic anisotropy field or film thickness increases. can also be reduced by using double layer medium with soft magnetic layer. These results suggest that the higher 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.