Calculation of eddy-current loss in multilayer magnetic films considering displacement current

At high frequency, displacement current in dielectric layers of multilayer magnetic thin films becomes significant, and eddy-current loss can be much worse than would be predicted without considering displacement current. Two-dimensional finite-element method simulations were used to study the behavior of eddy-current loss in multilayer thin films from 1 kHz to 1 GHz. A closed-form expression for accurate loss prediction with error less than 10% was developed, and its consistency with experimental measurements on Co-Zr-O/ZrO2 multilayer films was checked. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3074134]