Abstract
The low-frequency noise in epitaxial La0.7Sr0.3Mn1-xFexO3 thin films with x = 0, 0.08 and 0.12has been studied as a function of magnetic field (up to 1500 G). At zero external magneticfield (B = 0G), there is no appreciable peak in the normalized noise power spectral density (PSD)for x = 0thin films; however, a peak does appear for x = 0.08and 0.12 thin films near the metal–insulator transition temperature(Tp),which is below the Curie temperature. Unlike the resistivity,the noise PSD does not change with the doping level(x) at B = 0 G; however, at B = 1500 G the noise PSD decreaseswith x. At a low externalmagnetic field of B < 1500G, there is no or a small thermal hysteresis in the noisePSD for all three differently doped samples; however, at B = 1500G there appears a large thermal hysteresis for all samples. The contributionof magnetic domain fluctuations is a possible origin for the noise PSD.
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