Ultrafast magnetization dynamics in the half-metallic Heusler alloy
Open Access
- 14 September 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 104 (10), L100408
- https://doi.org/10.1103/physrevb.104.l100408
Abstract
We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy , probed by time-resolved magneto-optical Kerr effect. Experimental results are compared to results from electronic structure theory and atomistic spin-dynamics simulations. Experimentally, we find that the demagnetization time () in films of is almost independent of varying structural order, and that it is similar to that in elemental ferromagnets. In contrast, the slower process of magnetization recovery, specified by , is found to occur on picosecond time scales, and is demonstrated to correlate strongly with the Gilbert damping parameter (). Based on these results we argue that for the remagnetization process is dominated by magnon dynamics, something which might have general applicability.
Funding Information
- Vetenskapsrådet (2020-00681, 2019-03666, 2017-03799, 2016-04524, 2013-08316)
- Stiftelsen för Strategisk Forskning (EM16-0039)
- Knut och Alice Wallenbergs Stiftelse
- Swedish National Infrastructure for Computing
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