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2018 | 133 | 3 | 501-504
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Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film

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The work is devoted to studies of ultrafast magnetization dynamics induced by femtosecond laser pulses in ferromagnetic Ni-Mn-Sn shape memory Heusler alloy. We studied epitaxial thin Ni_{54.3}Mn_{31.9}Sn_{13.8} film deposited on (001) MgO substrate. Spin precession in an external magnetic field was triggered and detected by the time-resolved magneto-optical Kerr effect (TRMOKE) using pump-probe technique in dual color scheme experiment. Measurements were performed as a function of magnetic field H and pulse power P. The measured TRMOKE signal is composed of oscillatory and background components, both decaying exponentially in a nanosecond time scale. The precession frequency was determined and found to be varying in the range of 1-10 GHz with H up to 3 kOe and decreasing linearly with P. The dependence of Gilbert damping parameter α on H was determined and discussed.
  • Faculty of Mathematics and Informatics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland
  • Faculty of Mathematics and Informatics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland
  • NanoBioMedical Centre, AMU, Umultowska 85, 61-614 Poznań, Poland
  • Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
  • Faculty of Mathematics and Informatics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland
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