A Simple Approach for the Magnetic Relaxation in Systems of Weakly-Interacting, Dispersive Nanoparticles in Applied Magnetic Field

作者：Miu Dana; Sima Cornelia; Jinga S I; Vasile B S; Miu L^*

来源：Journal of Superconductivity and Novel Magnetism, 2014, 27(3): 781-785.

DOI：10.1007/s10948-013-2345-7

• Fe/Al2O3 nanocomposites
• Superparamagnetism
• Fe nanoparticle dispersion
• Magnetic relaxation

We investigated the magnetic relaxation of weakly interacting, dispersive, single domain Fe nanoparticles in Fe/Al2O3 composites prepared by sequential pulsed laser deposition on (100) Si substrates. The external magnetic field was oriented parallel to the substrate and applied in zero-field cooling conditions. It was found that the relaxation of the irreversible magnetic moment m (irr) is similar to the well-known vortex-creep process in disordered superconductors with poor supercurrent redistribution across the sample, leading to a power-law dependence of m (irr)(t), with a well-defined time t exponent.

• 出版日期2014-3