La0.7Sr0.3MnO3 Thin Films for Magnetic and Temperature Sensors at Room Temperature

Abstract

In this paper, the potentialities of the manganese oxide La0.7Sr0.3MnO3 (LSMO) for the realization of sensitive room temperature thermometers and magnetic sensors are discussed. LSMO exhibits both a large change of the resistance versus temperature at its metal-to-insulator transition (about 330 K) and low field magnetoresistive effects at room temperature. The sensor performances are described in terms of signal-to-noise ratio in the 1 Hz - 100 kHz frequency range. It is shown that due to the very low 1/f noise level, LSMO based sensors can exhibit competitive performances at room temperature.

Keywords

• Low frequency noise
• Magnetoresistance sensors
• Thermometers