Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al$_2$O$_3$
| dc.creator | Petracic, O. | |
| dc.creator | Glatz, A. | |
| dc.creator | Kleemann, W. | |
| dc.date | 2004-06-24 | |
| dc.date | 2005-01-13 | |
| dc.date.accessioned | 2026-07-07T02:58:49Z | |
| dc.date.available | 2026-07-07T02:58:49Z | |
| dc.description | The magnetization and magnetic ac susceptibility, $χ= χ' - i χ''$, of superferromagnetic systems are studied by numerical simulations. The Cole-Cole plot, $χ''$ vs. $χ'$, 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. | |
| dc.description | 8 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0406590 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0406590 | |
| dc.identifier | Phys. Rev. B 70, 214432 (2004) | |
| dc.identifier | doi:10.1103/PhysRevB.70.214432 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/24265 | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Models for the magnetic ac susceptibility of granular superferromagnetic CoFe/Al$_2$O$_3$ | |
| dc.type | text |