J. Phys. IV France 08 (1998) Pr2-665-Pr2-668
An automated system for measuring the complex impedance and its relaxation in soft magnetic materialsJ.P. Sinnecker1, M. Knobel2, M.L. Sartorelli2, J. Schonmaker2 and F.C.S. Silva2
1 Permanent address : Instituto de Magnetismo Aplicado, UCM-RENFE, Apartado de Correos 155, 28230 Las Rozas, Madrid, Spain
2 Instituto de Física Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), C.P. 6165, Campinas 13.083-970 S.P., Brazil
A fulfy automated system, designed to measure both components of the impedance as functions of applied field (up to 130 Oe), current intensity (up to 20 mA) and frequency (up to 1 MHz), is presented. Also, this apparatus allows impedance relaxation to be recorded. High sensitivity is achieved by using lock-in technique, and weak relative changes of the impedance, down to an order of 0.1%, can be observed.
© EDP Sciences 1998