Memory effects in interacting and non-interacting ion beam synthesized nanoparticle systems


Memory effects in interacting and non-interacting ion beam synthesized nanoparticle systems

Zhang, G.; Potzger, K.; Zhou, S.; Mücklich, A.; Ma, Y.; Fassbender, J.

The magnetic properties of both interacting and non-interacting iron nanoparticle systems were investigated by means of SQUID magnetometry. Both nanoparticle systems were produced by ion beam synthesis. For this purpose Fe+ was implanted into diamagnetic LaAlO3 substrates with a fluence of 6×1016 cm-2 at an energy of 120 keV at either 400°C or 800°C. It is observed that for the lower (higher) temperature a non-interacting (interacting) nanoparticle ensemble is created. The size distribution of the nanoparticles is studied by transmission electron microscopy. The memory effects in these systems were investigated by field-cooling and zero field-cooling magnetization measurements. Both analysis methods should help to settle the controversy whether the interaction between superparamagnetic particles or their size distribution is responsible for the memory effect [1, 2].

[1] Y. Sun et al., Phys. Rev. Lett. 91, 167206 (2003).
[2] R. K. Zheng et al., Phys. Rev. Lett. 93, 139702 (2004).

Keywords: magnetism; memory effects; nanoparticles; ion beam synthesis

  • Poster
    IBMM 2006, 18.-22.09.2006, Taormina, Italia

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Publ.-Id: 8426