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In situ measurements of the coercive force of thin film discs-a comparison of different techniques
By: Pressesky, J.L.; Lee, S.Y.;
1990 / IEEE
This item was taken from the IEEE Periodical ' In situ measurements of the coercive force of thin film discs-a comparison of different techniques ' Three critical-current detection schemes are compared for demagnetization effects: DC erase, initial pattern: 75 fc/mm: DC erase, initial pattern: 450 fc/mm; reverse DC erase (noise amplitude vs. reverse DC erase current); and amplitude saturation (isolated-pulse amplitude vs. write current). An analysis of the error between the coercivity estimated by the critical current and the coercivity as measured by a vibrating sample magnetometer allows inferences to be made concerning the effect of demagnetizing fields in each of these critical-current detection methods. In most of the cases considered, the demagnetization effects appeared to be independent of the demagnetizating ratio, and may thus be represented by a constant offset term to an otherwise linear relationship between critical current and remanent coercivity. The results obtained with regard to the DC/noise technique are somewhat contradictory with respect to results published by other investigators, but this may be due to the intrinsically low media noise of the CoCrTa media presently used.<
Magnetic Disc Storage
Thin Film Discs
Vibrating Sample Magnetometer
Low Media Noise
Magnetic Field Measurement
Magnetic Thin Film Devices
Fields, Waves And Electromagnetics