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    Theory of laser-induced demagnetization at high temperatures

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    PhysRevB.85.064408.pdf
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    Type
    Article
    Authors
    Manchon, Aurelien cc
    Li, Q.
    Xu, L.
    Zhang, S.
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Spintronics Theory Group
    Date
    2012-02-17
    Preprint Posting Date
    2011-12-12
    Permanent link to this record
    http://hdl.handle.net/10754/552989
    
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    Abstract
    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 B
    Publisher
    American Physical Society (APS)
    Journal
    Physical Review B
    DOI
    10.1103/PhysRevB.85.064408
    arXiv
    1112.2428
    Additional Links
    http://link.aps.org/doi/10.1103/PhysRevB.85.064408
    http://arxiv.org/abs/1112.2428
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevB.85.064408
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Spintronics Theory Group; Material Science and Engineering Program

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