Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film |
| A. Bondaa, S. Ubaa, K. Załęskib, J. Dubowikc and L. Ubaa
aFaculty of Mathematics and Informatics, University of Białystok, K. Ciołkowskiego 1M, 15-245 Białystok, Poland bNanoBioMedical Centre, AMU, Umultowska 85, 61-614 Poznań, Poland cInstitute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland |
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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 Ni54.3Mn31.9Sn13.8 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. |
DOI: 10.12693/APhysPolA.133.501 PACS numbers: 75.78.Jp, 75.50.-y, 78.47.J-, 75.30.-m, 06.60.Jn, 75.40.Gb |