PENETRATION OF RF ELECTROMAGNETIC FIELD THROUGH THIN FILMS OF La_(0.67)Ca_(0.33)MnO_3 MANGANITE

摘要

Peculiarities of penetration of electromagnetic waves through the bulk and thin film samples of the La_(0.67)Ca_(0.33)MnO_3 manganite were investigated for the frequency range from 50 kHz to 20 MHz. Strong variations of penetration coefficient in the applied dc magnetic field were observed both for ferromagnetic and paramagnetic states. Local dynamic magnetic ordering in the paramagnetic temperature range was observed. The experimental data reveal weak dependence of electromagnetic properties on microstructure of the films. The upper frequency limit of the dynamic polaron correlations in the paramagnetic phase was estimated.