Magnetization dynamics in epitaxial films induced by femtosecond optical pulses near the absorption edge

Savochkin, I. V.; Kozhaev, M. A.; Chernov, A. I.; Kuzmichev, A. N.; Zvezdin, A. K.; Belotelov, V. I.

doi:10.1134/s1063783417050262

Cited by 3 publications

(4 citation statements)

References 20 publications

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“…Similar deviation from monotonously increasing trend of the precession amplitude dependence on the pump pulse absorbtion was also observed in the Ref. 62, and was ascribed to generation of magnetostatic spin waves. We note also that, in our experiments optical transmission change also gradually increases with increase of absorption, except of the case of the highest absorption coefficient, indicating that some optical nonlinear effects may start to play a role in this absorption levels.…”

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confidence: 86%

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Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

et al. 2018

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We explore a thermal mechanism of changing the anisotropy by femtosecond laser pulses in dielectric ferrimagnetic garnets by taking a low symmetry (YBiPrLu)3(FeGa)5O12 film grown on the (210)-oriented Gd3Ga5O12 substrate as a model media. We demonstrate by means of spectral magneto-optical pump-probe technique and phenomenological analysis, that the magnetization precession in such a film is triggered by laser-induced changes of the growth-induced magnetic anisotropy along with the well-known ultrafast inverse Faraday effect. The change of magnetic anisotropy is mediated by the lattice heating induced by laser pulses of arbitrary polarization on a picosecond time scale. We show that the orientation of the external magnetic field with respect to the magnetization easy plane noticeably affects the precession excited via the anisotropy change. Importantly, the relative contributions from the ultrafast inverse Faraday effect and the change of different growth-induced anisotropy parameters can be controlled by varying the applied magnetic field strength and direction. As a result, the amplitude and the initial phase of the excited magnetization precession can be gradually tuned.

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confidence: 86%

“…51 This effect was already detected in garnet films. [59][60][61][62] It microscopically originates from the impulsive stimulated Raman scattering on magnons, 53,54 and can be described phenomenologically as a femtosecond pulse of an effective magnetic field induced by the circularly polarized laser pulse 51,63,64…”

Section: B Ultrafast Inverse Faraday Effectmentioning

confidence: 99%

Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

et al. 2018

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“…Ultrashort light pulses have emerged as an efficient tool to initiate and probe magnetization dynamics in iron garnets on the (sub)-picosecond time-scale [13][14][15][16]. The numerous studies on optically-induced magnetization dynamics in garnets have unraveled both dissipative [17,18] and non-dissipative [19,20] mechanisms to trigger magnetization precession, magnetization reversal [21] and spin wave propagation [22].…”

mentioning

confidence: 99%

“…The numerous studies on optically-induced magnetization dynamics in garnets have unraveled both dissipative [17,18] and non-dissipative [19,20] mechanisms to trigger magnetization precession, magnetization reversal [21] and spin wave propagation [22]. This impressive research effort has hitherto been mostly focused on relatively thick iron garnets (from 100 nm to few micrometers [16,22,23]), that provide large magneto-optical signals. The aforementioned experiments demonstrate that laser-induced heating in garnets is ubiquitous and it can either be the mechanism driving magnetization dynamics (change of magnetic anisotropy) or taking place simultaneously while other effects set spins in motion (opto-magnetic effects).…”

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confidence: 99%

Optically-induced frequency up-conversion of the ferromagnetic resonance in an ultrathin garnet

Soumah,

Bossini,

Anane

et al. 2020

Preprint

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We perform ultrafast pump-probe measurements on a nanometer-thick crystalline Bi-doped yttrium iron garnet film with perpendicular magnetic anisotropy. Tuning the photon energy of the pump laser pulses above and below the material's bandgap, we trigger ultrafast optical and spin dynamics via both one-and two-photon absorption. Contrary to the common scenario, the opticallyinduced heating of the system induces an increase up to 20% of the ferromagnetic resonance frequency. We explain this unexpected result in terms of a photo-induced modification of the magnetic anisotropy, i.e. of the effective field, identifying the necessary conditions to observe this effect. Our results disclose the possibility to optically increase the magnetic eigenfrequency in nanometer-thick magnets.

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Optical Frequency Up-Conversion of the Ferromagnetic Resonance in an Ultrathin Garnet Mediated by Magnetoelastic Coupling

Soumah

Bossini²,

Anane³

et al. 2021

Phys. Rev. Lett.

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Magnetization dynamics in epitaxial films induced by femtosecond optical pulses near the absorption edge

Cited by 3 publications

References 20 publications

Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

Ultrafast laser-induced changes of the magnetic anisotropy in a low-symmetry iron garnet film

Optically-induced frequency up-conversion of the ferromagnetic resonance in an ultrathin garnet

Optical Frequency Up-Conversion of the Ferromagnetic Resonance in an Ultrathin Garnet Mediated by Magnetoelastic Coupling

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