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The DC transport properties of and the radio-frequency (RF) wave absorption(at 1.33 MHz) in a ceramic sample of La_{0.5}Sr_{0.5}CoO_{3-\delta} aremeasured. The Curie temperature, T_{c}, of the sample is about 250 K. A giantnegative magnetoabsorption effect is found. In the vicinity of T_{c}, theabsolute value of the magnetoabsorption is about 38 % in the rather lowmagnetic field 2.1 kOe. This differs drastically from the measured DCmagnetoresistance (MR) \delta (H) =[R(0)-R(H)]/R(0) which is a mere 0.26 % nearT_{c}in the same field and increases to about 2.15 % in H=20 kOe. Thephenomenon can be understood taking into account that the magnetoabsorption isdetermined by influence of magnetic field on the conductivity and the magneticpermeability, while the MR is determined solely by the former. Themagnetoabsorption effect can be used to develop RF devices controlled bymagnetic field and temperature.Comment: 6 pages, 7 figures, submitted J. Appl. Phy

Giant radio-frequency magnetoabsorption effect in the cobaltite ceramic La0.5Sr0.5CoO3