Type
ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Spintronics Theory Group
Date
2012-02-17Preprint Posting Date
2011-12-12Permanent link to this record
http://hdl.handle.net/10754/552989
Metadata
Show full item recordAbstract
Laser-induced demagnetization is theoretically studied by explicitly taking into account interactions among electrons, spins, and lattice. Assuming that the demagnetization processes take place during the thermalization of the subsystems, the temperature dynamics is given by the energy transfer between the thermalized interacting baths. These energy transfers are accounted for explicitly through electron-magnon and electron-phonon interactions, which govern the demagnetization time scale. By properly treating the spin system in a self-consistent random phase approximation, we derive magnetization dynamic equations for a broad range of temperature. The dependence of demagnetization on the temperature and pumping laser intensity is calculated in detail. In particular, we show several salient features for understanding magnetization dynamics near the Curie temperature. While the critical slowdown in dynamics occurs, we find that an external magnetic field can restore the fast dynamics. We discuss the implication of the fast dynamics in the application of heat-assisted magnetic recording.Citation
Theory of laser-induced demagnetization at high temperatures 2012, 85 (6) Physical Review BPublisher
American Physical Society (APS)Journal
Physical Review BarXiv
1112.2428ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevB.85.064408