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Laser induced ultrafast 3d and 4f spin dynamics in CoDy ferrimagnetic alloys as a function of temperature

We report on an element- and time-resolved investigation of femtosecond laser induced ultrafast dynamics of 3d and 4f spins in a ferrimagnetic Co80Dy20 alloy as a function of temperature. We observe an increase of the Co3d characteristic demagnetization time and a decrease of the Dy4f demagnetization time when the temperature is approaching the Curie temperature. It suggests that the critical slowing down regime, which affects the laser induced ultrafast dynamics in pure 3d transition metals and 4f rare-earth ferromagnetic layers, vanishes for the Dy sublattice in the CoDy alloy, in line with the theoretical predictions of the Landau-Lifshitz-Bloch model.

preprint2020arXivOpen access
Tom FertéGrégory MalinowskiErwan TerrierValérie HaltéLoïc Le GuyaderKarsten HolldackMichel HehnChristine BoeglinNicolas Bergeard
cond-mat.mtrl-sci
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Tom FertéGrégory MalinowskiErwan TerrierValérie HaltéLoïc Le GuyaderKarsten HolldackMichel HehnChristine BoeglinNicolas Bergeard

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