Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al$_2$O$_3$

Details Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al$_2$O$_3$ Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al$_2$O$_3$

2004-06-24

arxiv.org/abs/cond-mat/0406590v2

Phys. Rev. B 70, 214432 (2004)

Physics

Condensed Matter

Disordered Systems and Neural Networks

8 pages, 6 figures

Scientific paper

10.1103/PhysRevB.70.214432

The magnetization and magnetic ac susceptibility, $\chi = \chi' - i \chi''$, of superferromagnetic systems are studied by numerical simulations. The Cole-Cole plot, $\chi''$ vs. $\chi'$, 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 Co$_{80}$Fe$_{20}$/Al$_{2}$O$_{3}$ 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.

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