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Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy

Abstract : Femtosecond-laser-induced ultrafast magnetization dynamics have been studied in multisublattice Co x Dy 1−x alloys. By performing element-and time-resolved x-ray spectroscopy, we distinguish the ultrafast quenching of Co 3d and Dy 4f magnetic order when the initial temperatures are below (T = 150 K) or above (T = 270 K), the temperature of magnetic compensation (T comp). In accordance with former element-resolved investigations and theoretical calculations, we observe different dynamics for Co 3d and Dy 4f spins. In addition, we observe that for a given laser fluence, the demagnetization amplitudes and demagnetization times are not affected by the existence of a temperature of magnetic compensation. However, our experiment reveals a twofold increase of the ultrafast demagnetization rates for the Dy sublattice at low temperature. In parallel, we measure a constant demagnetization rate of the Co 3d sublattice above and below T comp. This intriguing difference between the Dy 4f and Co 3d sublattices calls for further theoretical and experimental investigations.
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Tom Ferté, Nicolas Bergeard, L. Le Guyader, Michel Hehn, G. Malinowski, et al.. Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 96 (13), pp.134303 - 134303. ⟨10.1103/PhysRevB.96.134303⟩. ⟨hal-01624257⟩



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