2004/06/30 by O. Petracic, Andreas Glatz, A. Glatz +1 · 2 citations
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.dis-nn
paper · pdf · doi:10.1103/physrevb.70.214432
published as Phys. Rev. B 70, 214432 (2004) · 8 pages, 6 figures
openalex publication_date 2004/12/30 · arxiv created 2005/01/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The magnetization and magnetic ac susceptibility, \ensuremathχ=\ensuremathχ^\ensuremath'\ensuremath-i\ensuremathχ^\ensuremath'', of superferromagnetic systems are studied by numerical simulations. The Cole-Cole plot, \ensuremathχ^\ensuremath'' versus \ensuremathχ^\ensuremath', is used as a tool for classifying magnetic systems by their dynamical behavior. The simulations of the magnetization hysteresis and the ac susceptibility are performed with two approaches for a driven domain wall in random media. The studies are motivated by recent experimental results on the interacting nanoparticle system Co80Fe20∕Al2O3 showing superferromagnetic behavior. Its Cole-Cole plot indicates domain-wall motion dynamics similarly to a disordered ferromagnet, including pinning and sliding motion. With our models, we can successfully reproduce the features found in the experimental Cole-Cole plots.