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A computer‐controlled system for measuring M‐Hhysteresis loops of soft magnetic materials is described. It overcomes many of the problems associated with these kinds of measurements of low coercivity materials. The combination of ‘‘low drift’’ hardware and measurement procedure makes software correction unnecessary. At every field step, the homemade integrator is reset in order to minimize the drift and to provide a way of separating the sample contribution to the signal from the field contribution and, consequently, to allow M‐H plots. Furthermore, to avoid the residual drift of the hardware, the method of ‘‘two‐way measurement’’ is applied, giving drifts of 0.01% per hour. Results obtained for a FINEMET alloy filmannealed at different temperatures are presented, illustrating the ability of the system to measure soft magnetic materials.This work was supported by the CICYT of the Spanish Government (Project MAT95-961-CO2-01) and the PAI of the Regional Government of Andalucía. V. Franco wishes to thank the "Fundación Cámara" of the University of Sevilla for the fellowship.Peer reviewe

Autocalibrating quasistatic M-H hysteresis loop tracer with negligible drift