ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have studied the dynamics of magnetization reversal processes in magneto-optic recording CoPt samples with perpendicular anisotropy. Thin films of subatomic layered Co25Pt75 alloys as well as Co/Pt multilayers with total thicknesses up to 300 A(ring) were investigated. By means of polar Kerr microscopy we were able to obtain the magnetic domain pattern. High temporal resolution was achieved by using a rapid scanning CCD camera system. Depending on film parameters, we found wall motion dominated and nucleation dominated magnetic reversal processes. Detailed analysis of the domain topography shows evidence for a correlation of the fractal dimension of the domain shape to the macroscopic coercivity measured with a VSM and conventional Kerr hysteresis loops. In particular, we investigated the dynamics of magnetization reversal and observed magnetic aftereffect phenomena. The time constant of the relaxation of the magnetization is strongly affected by the film structure and by the film thickness. We discuss our results in terms of the theoretical relaxation model of Fatuzzo and recent computer simulations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.356714
