Parametric dependence of hot electron relaxation timescales on electron-electron and electron-phonon interaction strengths

Wilson, R. B.; Coh, Sinisa

doi:10.1038/s42005-020-00442-x

Cited by 31 publications

(43 citation statements)

References 62 publications

(165 reference statements)

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“…This value is roughly 10 times lower than the energy transfer coefficient between Au electrons and Au phonons. The electron-phonon energy transfer coefficient in Au is proportional to the rate of spontaneous phonon emission by a hot electron [45]. Therefore, we estimate the rate of REIG magnon emission by hot electrons in proximity to the interface is roughly one order of magnitude lower than the rate of Au phonon emission.…”

Section: Discussionmentioning

confidence: 82%

Ultrafast measurements of the interfacial spin Seebeck effect in Au and rare-earth iron-garnet bilayers

Ortiz

Gomez

Liu

et al. 2021

Phys. Rev. Materials

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We investigate picosecond spin currents across Au/iron-garnet interfaces in response to ultrafast laser heating of the electrons in the Au film. In the picoseconds after optical heating, interfacial spin currents occur due to an interfacial temperature difference between electrons in the metal and magnons in the insulator. We report measurements of this interfacial longitudinal spin Seebeck effect between Au and rare-earth iron-garnet insulators, i.e., RE 3 Fe 5 O 12 , where RE is Y, Eu, Tb, Tm. By systematically varying the rare-earth element, we modify the total magnetic moment of the iron garnet. We use time-domain thermoreflectance measurements to characterize the thermal response of the bilayer to ultrafast optical heating. We use time-resolved magneto-optic Kerr effect measurements of the Au layer to measure the time evolution of spin accumulation in the Au film. Replacing Y with other rare earths enhances the electron-magnon conductance G e−m at the Au iron-garnet interface by as much as a factor of 3. The electron-magnon conductance does not follow the trend of either the total magnetization of the iron garnet or the magnetic moment of the rare earth.

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Section: Discussionmentioning

confidence: 82%

Ultrafast measurements of the interfacial spin Seebeck effect in Au and rare-earth iron-garnet bilayers

Ortiz

Gomez

Liu

et al. 2021

Phys. Rev. Materials

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“…Here, we focus on momentum changes and the net effect of the scattering between electrons and nuclei by assuming a constant characteristic time τ el . We will analyse the dynamics for two values: τ el = 25 fs taken from [29], which was used to study spin transport and spin dynamics in [9,30], and τ el = 12 fs from [31,32]. We will not take into account the loss of energy due to recoil for this simulation but focus solely on the change of the direction of flight.…”

Section: Elastic Scattering: Electron-nucleus Interactionmentioning

confidence: 99%

Monte Carlo simulation of ultrafast nonequilibrium spin and charge transport in iron

Briones

Schneider²,

Rethfeld³

2022

J. Phys. Commun.

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Spin transport and spin dynamics after femtosecond laser pulse irradiation of iron (Fe) are studied using a kinetic Monte Carlo model. This model simulates spin dependent dynamics by taking into account two interaction processes during nonequilibrium: Elastic electron--lattice scattering, where only the direction of the excited electrons changes, and inelastic electron--electron scattering processes, where secondary electrons are generated. An analysis of the spin dependent particle kinetics inside the material shows that a smaller elastic scattering time leads to a larger spatial spread of electrons in the material, whereas generation of secondary electrons extends the time span for superdiffusive transport and increases the spin current density.

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“…[29] and τ el = 12 fs from Ref. [30]. We will not take into account the loss of energy due to recoil for this simulation.…”

Section: Elastic Scattering: Electron -Nucleus Interactionmentioning

confidence: 99%

Monte Carlo simulation of ultrafast nonequilibrium spin and charge transport in iron

Briones¹,

Schneider²,

Rethfeld³

2021

Preprint

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Spin transport and spin dynamics after femtosecond laser pulse irradiation of iron (Fe) are studied using a kinetic Monte Carlo model. This model simulates spin dependent dynamics by taking into account two interaction processes during nonequilibrium: Elastic electron -lattice scattering, where only the direction of the excited electrons changes neglecting the energy loss, and inelastic electron -electron interaction, where secondary electrons are generated. An analysis of the particle kinetics inside the material shows that a smaller elastic scattering time affects the spin dynamics by leading to a larger spatial spread of electrons in the material, whereas generation of secondary electrons affects the spin transport with a larger time of propagation of homogeneous spin polarization.

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Parametric dependence of hot electron relaxation timescales on electron-electron and electron-phonon interaction strengths

Cited by 31 publications

References 62 publications

Ultrafast measurements of the interfacial spin Seebeck effect in Au and rare-earth iron-garnet bilayers

Ultrafast measurements of the interfacial spin Seebeck effect in Au and rare-earth iron-garnet bilayers

Monte Carlo simulation of ultrafast nonequilibrium spin and charge transport in iron

Monte Carlo simulation of ultrafast nonequilibrium spin and charge transport in iron

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