<i>Ab initio</i>
 theory of magnetization induced by light absorption in ferromagnets

Scheid, P.; Malinowski, Grégory; Mangin, Stéphane; Lebègue, Sébastien

doi:10.1103/physrevb.100.214402

Cited by 9 publications

(13 citation statements)

References 26 publications

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“…This past analysis has been done assuming that the magnetic response of the system is dominated by linear order in perturbation. Even though, as mentioned above, our work also includes a nonlinear effect, in order to comment on the relative importance of these contributions, we perform the following analysis: according to Battiato et al 11,12 M HD (t) is composed of a transient signal, oscillating parts, the absorptive contribution which leads to MILA, 14 and the zeroth harmonic which leads to the IFE. 10−13 To remove the oscillatory and transient contributions which together time average to 0, we perform a convolution of M HD with a Gaussian having a root-mean-square of 2 fs.…”

Section: Nano Letters Pubsacsorg/nanolettmentioning

confidence: 99%

Ab Initio Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime

et al. 2021

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Section: Nano Letters Pubsacsorg/nanolettmentioning

confidence: 99%

Ab Initio Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime

et al. 2021

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“…The inverse Faraday effect has been investigated using different theoretical approaches. − This effect was also studied for different bulk materials using density functional theory (DFT), and the effect of spin–orbit coupling was also recently explored . The plasmonic properties of the inverse Faraday effect in metal nanoparticles were also investigated by several groups. , In a recent work, some of the authors of the present study used a quantum hydrodynamic (QHD) model − to describe the interaction between the surface plasmons in gold nanoparticles and circularly polarized light.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…14 The inverse Faraday effect has been investigated using different theoretical approaches. [15][16][17][18] This effect was also studied for different bulk materials using density functional theory (DFT), 19 and the effect of spin-orbit coupling was also recently explored. 17 The plasmonic properties of the inverse Faraday effect in metal nanoparticles were also investigated by several groups.…”

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confidence: 99%

Driving Orbital Magnetism in Metallic Nanoparticles through Circularly Polarized Light: A Real-Time TDDFT Study

et al. 2020

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Transfer of angular momentum from helicity-controlled laser fields to non-magnetic electronic system can lead to the creation of magnetization. The underlying mechanism in metallic nanoparticles have been studied using different theoretical approaches. However, an understanding of the dynamics using orbital-based quantum-mechanical method within the many-body theoretical framework is still due. To this end, the realtime formulation of time-dependent density-functional theory is used to study induced orbital magnetism in metallic nanoparticles (clusters) excited by circularly polarized light. The nanoparticles are described by a spherical jellium model on a real-space 1 grid. The polarized laser field gives rise to an angular momentum, and hence a magnetic moment, which is maximum at the surface plasmon frequency of the nanoparticle, revealing that this is a resonant plasmonic effect. The primary contribution to the magnetic moment comes from surface currents generated by the plasmonic field, although some bulk contributions due to the quantum-mechanical nature of the system (Friedel oscillations) still persist. We compare several nanoparticles of K, Na, and Au having the same size and excited at their respective plasmon frequencies and show that the generated magnetic moment per energy pumped into the system is maximum for K and minimum for Au. A similar trend is observed for nanoparticles of the same chemical species but different sizes.

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“…Under the incoherent approximation, we can reduce the number of unknowns from 8N to 4N, only including the population P z and the magnetization vector M. This reduces the amount of memory and operations required to solve the system numerically. Moreover, in the incoherent approximation, the optical excitation is represented by an effective pumping G between |2 and |3 , which can be calculated from first principles [46]. The value of the optical pumping G can be obtained by using the Fermi golden rule:…”

Section: Incoherent Excitation Approximationmentioning

confidence: 99%

A phenomenological theory of the optical magnetization reversal

Menarini,

Lomakin

2020

Preprint

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All-optical switching of the magnetization in magnetic nanostructures by femtosecond circularly polarized laser pulses has been demonstrated in several systems. We present a Landau-Lifshitz-Lambda (LLL) model which describes the magnetization dynamics using three density states: two ferromagnetic grounds states and an excited optical state. One of the ferromagnetic ground states is optically excited by circularly polarized light to a spin reversed state, which is then "Coulomb collapsed" to the magnetization reversed ground state. The time evolution of the optically excited states is described by a Lindblad master equation, in which the optical excitation is introduced via the Hamiltonian. Dissipation terms are introduced via Lindblad operators. The LLL model combines the precessional motion of the magnetization described by the Landau-Lifshitz theory, with the response of the three level Λ system. The optical excitation lasts for the duration of the laser pulse and the system relaxes at a fast rate due to the electron-electron interaction. We study the solution of the eigenvalues problem of the optical equation of motion for the magnetization and identify a coherent and incoherent regimes and derive an LLL model that can be integrated with existing micromagnetic codes to describe optical excitation of magnetic materials.

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Ab initio theory of magnetization induced by light absorption in ferromagnets

Cited by 9 publications

References 26 publications

Ab Initio Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime

Ab Initio Study of Helicity-Dependent Light-Induced Demagnetization: From the Optical Regime to the Extreme Ultraviolet Regime

Driving Orbital Magnetism in Metallic Nanoparticles through Circularly Polarized Light: A Real-Time TDDFT Study

A phenomenological theory of the optical magnetization reversal

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