Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO2 granular media
Influence of intergranular exchange coupling on the magnetization dynamics of CoCrPt:SiO2 granular media
Brandt, R.; Tibus, S.; Springer, F.; Fassbender, J.; Rohrmann, H.; Albrecht, M.; Schmidt, H.
We investigate the effect of Co+ irradiation on the magnetization dynamics of CoCrPt:SiO2 granular media. Increasing irradiation levels reduce the saturation magnetization and effective anisotropy, which decrease the intrinsic magnetization precession frequency. Furthermore, increasing intergranular exchange coupling results in a qualitative change in the behavior of the magnetic material from a collection of individual grains to a homogeneous thin film, as evidenced in both the switching behavior and dynamics. The frequency change cannot be explained by single crystal macrospin modeling, and can only be reproduced by the inclusion of the dipolar effects and anisotropy distribution inherent in a granular medium.
Keywords: ion irradiation; ion implantation; magnetism; magnetic storage
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 17876) publication
-
Journal of Applied Physics 112(2012), 033918
DOI: 10.1063/1.4745906
Cited 7 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-17876