Spin current generation by ultrafast laser pulses in ferromagnetic nickel films

Hurst, Jérôme; Hervieux, Paul-Antoine; Manfredi, Giovanni

doi:10.1103/physrevb.97.014424

Cited by 22 publications

(26 citation statements)

References 37 publications

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“…The corresponding semiclassical matrix spin Vlasov equation, coupled to Maxwell's equations, constitutes a viable mean-field model where the electron orbital motion is treated classically, while the spin is a fully quantum variable (Hurst et al 2014;Hurst, Hervieux & Manfredi 2017). This approach was recently used to study the generation of spin currents in ferromagnetic thin films (Hurst, Hervieux & Manfredi 2018).…”

Section: Introductionmentioning

confidence: 99%

Geometric particle-in-cell methods for the Vlasov–Maxwell equations with spin effects

Crouseilles

Hervieux

et al. 2021

J. Plasma Phys.

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We propose a numerical scheme to solve the semiclassical Vlasov–Maxwell equations for electrons with spin. The electron gas is described by a distribution function $f(t,{\boldsymbol x},{{{\boldsymbol p}}}, {\boldsymbol s})$ that evolves in an extended 9-dimensional phase space $({\boldsymbol x},{{{\boldsymbol p}}}, {\boldsymbol s})$ , where $\boldsymbol s$ represents the spin vector. Using suitable approximations and symmetries, the extended phase space can be reduced to five dimensions: $(x,{{p_x}}, {\boldsymbol s})$ . It can be shown that the spin Vlasov–Maxwell equations enjoy a Hamiltonian structure that motivates the use of the recently developed geometric particle-in-cell (PIC) methods. Here, the geometric PIC approach is generalized to the case of electrons with spin. Total energy conservation is very well satisfied, with a relative error below $0.05\,\%$ . As a relevant example, we study the stimulated Raman scattering of an electromagnetic wave interacting with an underdense plasma, where the electrons are partially or fully spin polarized. It is shown that the Raman instability is very effective in destroying the electron polarization.

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Section: Introductionmentioning

confidence: 99%

Geometric particle-in-cell methods for the Vlasov–Maxwell equations with spin effects

Crouseilles

Hervieux

et al. 2021

J. Plasma Phys.

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“…Furthermore, when calculating the ground-state solution, the values of the magnetic exchange coupling constants J and K are fixed by imposing the correct Curie temperature for nickel (T C = 631 K) and the correct ratio between the magnetization of the itinerant electrons (M e = 0.066 µ B /atom) 16 and that of the localized ions (M i = 0.54 µ B /atom). 12 In Fig. 1, we show the computed ground-state densities and corresponding confining potentials, for the spin-up and spin-down components of the electron population in a 8.4 nm nickel film (L = 100L F ) at room temperature.…”

Section: Ground State Propertiesmentioning

confidence: 99%

Ultrafast spin current generation in ferromagnetic thin films

2018

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Spin currents have been shown to play a key role in the ultrafast laser-driven demagnetization process in ferromagnetic thin films. Here, we show that an oscillating spin current can be generated in the film via the application of a femtosecond laser pulse in the visible range. In particular, we prove that the spin current is due to ballistic electrons traveling back and forth in the film. The dependence of the current intensity on the driving electric field is also investigated.

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“…The emission is dominated by the electric dipole emission driven by a time varying ISHE-type electric current [4,5]. Theoretically, the Boltzmann transport theory has been proven to be an adequate tool to simulate excited carrier dynamics in metallic structures on the nanoscale [4,[9][10][11][12], however, in this review, the theoretical approaches are out of the focus.…”

Section: Introductionmentioning

confidence: 99%

THz spintronic emitters: a review on achievements and future challenges

2020

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The field of THz spintronics is a novel direction in the research field of nanomagnetism and spintronics that combines magnetism with optical physics and ultrafast photonics. The experimental scheme of the field involves the use of femtosecond laser pulses to trigger ultrafast spin and charge dynamics in thin films composed of ferromagnetic and nonmagnetic thin layers, where the nonmagnetic layer features a strong spin–orbit coupling. The technological and scientific key challenges of THz spintronic emitters are to increase their intensity and to shape the frequency bandwidth. To achieve the control of the source of the radiation, namely the transport of the ultrafast spin current is required. In this review, we address the generation, detection, efficiency and the future perspectives of THz emitters. We present the state-of-the-art of efficient emission in terms of materials, geometrical stack, interface quality and patterning. The impressive so far results hold the promise for new generation of THz physics based on spintronic emitters.

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Spin current generation by ultrafast laser pulses in ferromagnetic nickel films

Cited by 22 publications

References 37 publications

Geometric particle-in-cell methods for the Vlasov–Maxwell equations with spin effects

Geometric particle-in-cell methods for the Vlasov–Maxwell equations with spin effects

Ultrafast spin current generation in ferromagnetic thin films

THz spintronic emitters: a review on achievements and future challenges

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