Giant magneto-impedance effects in sintered La1−xCaxMnO3 oxides

Abstract We report on the study of high-frequency magneto-transport properties in the sintered La 1− x Ca x MnO 3 oxides. Experimental results have demonstrated a giant magneto-impedance (GMI) effect, much larger than the DC magneto-resistive effect, in these manganese oxides. The temperature and frequency dependence of the magneto-impedance is dependent on the ratio of Mn +3 /Mn +4 and the magnetic phase state in these compounds. Our result implies a possible sensitive probe of complex phase states at high frequency and the further technical GMI applications.