Year: 2021
Type: article
Abstract: We report on optically induced, ultrafast magnetization dynamics in the Heusler alloy ${\mathrm{Co}}_{2}\mathrm{FeAl}$, 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 (${\ensuremath{\tau}}_{M}$) in films of ${\mathrm{Co}}_{2}\mathrm{FeAl}$ is almost independent of varying structural order, and that it is similar to that in elemental $3d$ ferromagnets. In contrast, the slower process of magnetization recovery, specified by ${\ensuremath{\tau}}_{R}$, is found to occur on picosecond time scales, and is demonstrated to correlate strongly with the Gilbert damping parameter ($\ensuremath{\alpha}$). Based on these results we argue that for ${\mathrm{Co}}_{2}\mathrm{FeAl}$ the remagnetization process is dominated by magnon dynamics, something which might have general applicability.
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: Interplay between spin and lattice degree-of-freedom in ultrafast dynamics, Ultrafast dynamics in functional materials, Magnetiska material för grön energiteknologi, Spin currents and interface effects in magnetic heterostructures, Dynamics of Materials, Ferroelectric and 2D Material Heterostructures: A New Route for the Electrical Control of Magnetism
OpenAlex ID: W3200027848