A lanthanum-strontium manganite: HF absorption features in the 2-30 MHz frequency range

The RF magnetic response of a La0.8Sr0.2MnO3 single crystal was studied in a frequency range from 2 to 30 MHz. The main contribution to the RF absorption in this range is related to the hysteresis losses. A new frequency-dependent anomaly in the HF absorption spectrum was observed and interpreted as being due to relaxation with a characteristic time above 10(-7) s. The HF absorption measured as function of the field strength exhibits a sharp drop on approaching the saturation field, which makes the manganite studied a convenient material for the field and temperature sensors. (C) 2001 MAIK "Nauka/Interperiodica".