Article ID Journal Published Year Pages File Type
1801423 Journal of Magnetism and Magnetic Materials 2010 4 Pages PDF
Abstract

Slow fluctuations of the electrical resistance R have been systematically observed in three glass-ceramics containing aggregates of magnetite nanoparticles, in measurements where R was studied as a function of time at the magnetic remanence. These fluctuations are shown to be an intrinsic (i.e., not instrumental or spurious) feature of these materials. The associated electrical noise has been obtained by performing a numerical FFT transform of different segments of the R(t) curves after proper baseline subtraction. In this way, the spectral density has been investigated in the very low-frequency region (1×10−3

Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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