Driving ferromagnets into a critical region of a magnetic phase diagram

Abstract

Exciting a ferromagnetic sample with an ultrashort laser pulse leads to a quenching of the magne- tization on a subpicosecond timescale. On the basis of the equilibration of intensive thermodynamic variables we establish a powerful model to describe the demagnetization dynamics. We demonstrate that the magnetization dynamics is mainly driven by the equilibration of chemical potentials. The minimum of magnetization is revealed as a transient electronic equilibrium state. Our method iden- tifies the slowing down of ultrafast magnetization dynamics by a critical region within a magnetic phase diagram.

References in corpus (3)

• Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
• Dynamic approach for micromagnetics close to the Curie temperature
• Influence of laser-excited electron distributions on the x-ray magnetic circular dichroism spectra: Implications for femtosecond demagnetization in Ni

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• Ultrafast demagnetization in ferromagnetic materials: Origins and progress
• Implementation of the electronic non-equilibrium in the two-temperature model
• Ultrafast magnetization reversal in ferromagnetic spin-valves: an s-d model perspective
• Tuning the laser-induced ultrafast demagnetization of transition metals
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• Non-thermal electrons open the non-equilibrium pathway of the phase transition in FeRh
• Ultrafast demagnetization of iron induced by optical vs terahertz pulses
• Electronic mechanism of sub-100-fs demagnetization induced by a femtosecond light pulse