Abstract
Laser-induced ultrafast demagnetization in ferrimagnetic GdFeCo thin films was studied experimentally as a function of Gd concentration (, 22, 24, 30%, and –10%), pump fluence, and sample temperature. The results showed that the conditions for full demagnetization at the ultrafast time scale in GdFeCo thin metal films are easily achieved below the magnetization compensation point () and, furthermore, when the ratio between Gd and Fe concentrations is not too large. Consequently, the ultrafast demagnetization strongly depends on the initial temperature of these alloys compared to their . These results provide further insight into the unconventional ultrafast dynamics of multisublattice metallic magnets.
2 More- Received 2 March 2012
DOI:https://doi.org/10.1103/PhysRevB.86.054442
©2012 American Physical Society