Ultrafast and Distinct Spin Dynamics in Magnetic Alloys

RADU, I., STAMM, C., ESCHENLOHR, A., RADU, F., ABRUDAN, R., VAHAPLAR, K., KACHEL, T., PONTIUS, N., MITZNER, R., HOLLDACK, K., F\"HLISCH, A., OSTLER, Thomas, MENTINK, J. H., EVANS, R. F. L., CHANTRELL, R. W., TSUKAMOTO, A., ITOH, A., KIRILYUK, A., KIMEL, a. V. and RASING, Th. (2015). Ultrafast and Distinct Spin Dynamics in Magnetic Alloys. SPIN, 5 (3), p. 1550004.

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Official URL: http://www.worldscientific.com/doi/10.1142/S201032...
Link to published version:: https://doi.org/10.1142/S2010324715500046
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    Abstract

    Controlling magnetic order on ultrashort timescales is crucial for engineering the next-generation magnetic devices that combine ultrafast data processing with ultrahigh-density data storage. An appealing scenario in this context is the use of femtosecond (fs) laser pulses as an ultrafast, external stimulus to fully set the orientation and the magnetization magnitude of a spin ensemble. Achieving such control on ultrashort timescales, e.g., comparable to the excitation event itself, remains however a challenge due to the lack of understanding the dynamical behavior of the key parameters governing magnetism: The elemental magnetic moments and the exchange interaction. Here, we investigate the fs laser-induced spin dynamics in a variety of multi-component alloys and reveal a dissimilar dynamics of the constituent magnetic moments on ultrashort timescales. Moreover, we show that such distinct dynamics is a general phenomenon that can be exploited to engineer new magnetic media with tailor-made, optimized dynamic properties. Using phenomenological considerations, atomistic modeling and time-resolved X-ray magnetic circular dichroism (XMCD), we demonstrate demagnetization of the constituent sub-lattices on significantly different timescales that depend on their magnetic moments and the sign of the exchange interaction. These results can be used as a “recipe” for manipulation and control of magnetization dynamics in a large class of magnetic materials.

    Item Type: Article
    Departments - Does NOT include content added after October 2018: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
    Identification Number: https://doi.org/10.1142/S2010324715500046
    Page Range: p. 1550004
    Depositing User: Thomas Ostler
    Date Deposited: 31 Mar 2017 08:40
    Last Modified: 26 Jan 2018 23:54
    URI: http://shura.shu.ac.uk/id/eprint/15288

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