Gilbert damping in NiFeGd compounds: Ferromagnetic resonance versus time-resolved spectroscopy

Salikhov, Ruslan; Alekhin, Alexandr; Parpiiev, T.; Pézeril, Thomas; Makarov, Denys; Abrudan, R.; Meckenstock, R.; Radu, F.; Farle, Michael; Zabel, H.; Temnov, Vasily V.

doi:10.1103/physrevb.99.104412

Cited by 20 publications

(20 citation statements)

References 40 publications

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“…During the last decades, these techniques have been advanced in the context of ultrafast demagnetization dynamics [11,12] that paved the way for the description of new physics at the sub-picosecond regime. High-frequency resonant modes of exchange magnons have been measured with ultrafast time-resolved optical techniques [8,10,13]. Therefore, the validity of the LLG equations has been confirmed down to the picosecond time scale and below.…”

Section: Introductionmentioning

confidence: 90%

“…Figure 5 highlights the remarkable role of exchange stiffness to achieve the dispersion crossing between nutation magnons and longitudinal acoustic phonons. Doping Py thin films with Gadolinium has been shown to gradually reduce the exchange stiffness upon Gd-concentration from 300 to 100 [meV• Å2 ] [13]. For a fixed value of inertial parameter β=0.276 ps, nutation magnons for pure Py samples do not display any crossing with acoustic phonons within the displayed range of k-vectors but the Gd-doped Py with 13% Gd concentration does.…”

Section: Excitation Mechanisms Of Inertial Exchange Magnonsmentioning

confidence: 99%

“…1). Section V discusses the conditions for phase-matched excitation the nutation magnons by co-propagating longitudinal acoustic phonons, illustrated by the material parameters for Gd-doped Permalloy thin films [13].…”

Section: Introductionmentioning

confidence: 99%

“…Magneto-elastic coupling with inertial mangon is efficient when the dashed line lies within the pink tinted area. Material parameters are taken from Ref [13]. and β=0.276 ps.…”

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confidence: 99%

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Anatomy of inertial magnons in ferromagnets

Lomonosov,

Temnov,

Wegrowe

2021

Preprint

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We analyze dispersion relations of magnons in ferromagnetic nanostructures with uniaxial anisotropy taking into account inertial terms, i.e. magnetic nutation. Inertial effects are parametrized by damping-independent parameter β, which allows for an unambiguous discrimination of inertial effects from Gilbert damping parameter α. The analysis of magnon dispersion relation shows its two branches are modified by the inertial effect, albeit in different ways. The upper nutation branch starts at ω = 1/β, the lower branch coincides with FMR in the long-wavelength limit and deviates from the zero-inertia parabolic dependence ≃ ωF M R + Dk 2 of the exchange magnon. Taking a realistic experimental geometry of magnetic thin films, nanowires and nanodiscs, magnon eigenfrequencies, eigenvectors and Q-factors are found to depend on the shape anisotropy. The possibility of phase-matched magneto-elastic excitation of nutation magnons is discussed and the condition was found to depend on β, exchange stiffness D and the acoustic velocity.

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Section: Introductionmentioning

confidence: 90%

Section: Excitation Mechanisms Of Inertial Exchange Magnonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Magneto-elastic coupling with inertial mangon is efficient when the dashed line lies within the pink tinted area. Material parameters are taken from Ref [13]. and β=0.276 ps.…”

mentioning

confidence: 99%

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Anatomy of inertial magnons in ferromagnets

Lomonosov,

Temnov,

Wegrowe

2021

Preprint

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“…We report a numerical study of exchange magnons in a 30-nm nickel film excited by picosecond acoustic pulses. Typical experimental configuration for magneto-acoustic [19][20][21] and magnonic [37] measurements is presented in Fig. 1 (a).…”

Section: Experimental Geometry and Main Equationsmentioning

confidence: 99%

Generation of exchange magnons in thin ferromagnetic films by ultrashort acoustic pulses

Besse

Golov

Vlasov

et al. 2020

Journal of Magnetism and Magnetic Materials

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We investigate generation of exchange magnons by ultrashort, picosecond acoustic pulses propagating through ferromagnetic thin films. Using the Landau-Lifshitz-Gilbert equations we derive the dispersion relation for exchange magnons for an external magnetic field tilted with respect to the film normal. Decomposing the solution in a series of standing spin wave modes, we derive a system of ordinary differential equations and driven harmonic oscillator equations describing the dynamics of individual magnon mode. The external magnetoelastic driving force is given by the time-dependent spatial Fourier components of acoustic strain pulses inside the layer. Dependencies of the magnon excitation efficiencies on the duration of the acoustic pulses and the external magnetic field highlight the role of acoustic bandwidth and phonon-magnon phase matching. Our simulations for ferromagnetic nickel evidence the possibility of ultrafast magneto-acoustic excitation of exchange magnons within the bandwidth of acoustic pulses in thin samples under conditions readily obtained in femtosecond pump-probe experiments.

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