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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Ultrafast demagnetization by hot electrons: Diffusion or super-diffusion?

G Salvatella1, R Gort1, K Bühlmann1

  • 1Laboratory for Solid State Physics , ETH Zurich, 8093 Zurich, Switzerland.

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This summary is machine-generated.

Ultrafast demagnetization in nickel was achieved using electronic heating from a laser-pumped absorber layer. Varying absorber thickness revealed distinct electron contributions and confirmed heat transport models for demagnetization dynamics.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Ultrafast demagnetization of ferromagnetic materials is crucial for magnetic storage technologies.
  • Electronic heating via laser absorption offers a pathway for rapid demagnetization.

Purpose of the Study:

  • To investigate ultrafast demagnetization in nickel induced by electronic heating.
  • To differentiate the roles of thermalized and non-thermal electrons in the demagnetization process.
  • To model the demagnetization amplitude and time dependence on absorber layer thickness.

Main Methods:

  • Fabrication of nickel samples with varying non-magnetic absorber layer thicknesses.
  • Pump-probe spectroscopy to induce and measure ultrafast demagnetization.
  • Analysis of demagnetization dynamics as a function of absorber thickness.

Main Results:

  • Demagnetization was observed and linked to electronic heating in the absorber layer.
  • The study distinguished contributions from thermalized and non-thermal electrons.
  • An analytical model accurately described demagnetization amplitude versus absorber thickness.
  • Observed changes in demagnetization time were consistent with diffusive heat transport.

Conclusions:

  • Electronic heating provides an effective route for ultrafast demagnetization of nickel.
  • The interplay between thermalized and non-thermal electrons influences demagnetization.
  • Diffusive heat transport governs the temporal dynamics of laser-induced demagnetization.