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

O. Petracic, A. Glatz, W. Kleemann

The magnetization and magnetic ac susceptibility, $\chi ={\chi }^{\prime }-i{\chi }^{\prime \prime }$, of superferromagnetic systems are studied by numerical simulations. The Cole-Cole plot, ${\chi }^{\prime \prime }$ vs. ${\chi }^{\prime }$, is used a…