Penetration of the electromagnetic waves through doped lanthanum manganites

Penetration of the electromagnetic field through plate-shaped bulk polycrystalline sintered Pb and Y–Ba doped manganite samples is studied in the frequency range from 20 kHz to 30 MHz. Strong magnetic-field dependence of the transmission coefficient is observed. The penetration data are compared with the other magnetic-field dependent parameters: the magnetic permeability, magnetoresistance, and magnetoimpedance. Unusual frequency dependence of the penetration depth is observed.