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Title: Low-frequency noise in La0.7Sr0.3Mn1-xFexO3 thin films
Authors: Han, K.-H.
Huang, Q.
Ong, P.C.
Ong, C.K. 
Issue Date: 8-Jul-2002
Source: Han, K.-H.,Huang, Q.,Ong, P.C.,Ong, C.K. (2002-07-08). Low-frequency noise in La0.7Sr0.3Mn1-xFexO3 thin films. Journal of Physics Condensed Matter 14 (26) : 6619-6625. ScholarBank@NUS Repository.
Abstract: The low-frequency noise in epitaxial La0.7Sr0.3Mn1-xFexO3 thin films with x = 0, 0.08 and 0.12 has been studied as a function of magnetic field (up to 1500 G). At zero external magnetic field (B = 0 G), there is no appreciable peak in the normalized noise power spectral density (PSD) for x = 0 thin films; however, a peak does appear for x = 0.08 and 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 decreases with x. At a low external magnetic field of B < 1500 G, there is no or a small thermal hysteresis in the noise PSD for all three differently doped samples; however, at B = 1500 G there appears a large thermal hysteresis for all samples. The contribution of magnetic domain fluctuations is a possible origin for the noise PSD.
Source Title: Journal of Physics Condensed Matter
ISSN: 09538984
DOI: 26/302
Appears in Collections:Staff Publications

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