Ultrafast demagnetization of Co25Ni75∕Pt multilayers with perpendicular anisotropy at elevated temperatures

Wilks, Richard J.; Hicken, R. J.; Ali, M.; Hickey, B. J.

doi:10.1063/1.1847991

Cited by 9 publications

(1 citation statement)

References 16 publications

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“…For example, excitation by a femtosecond laser pulse of magnetically ordered metals results in subpicosecond increase of the electronic temperature which determines subsequent dynamics of other subsystem. [34][35][36] Therefore, in such media changes of the shape and magnetocrystalline anisotropies mostly result from the ultrafast heating 31,32 and related effects. 33 By contrast, magnetically ordered dielectrics subjected to femtosecond laser pulses demonstrate a variety of both thermal and nonthermal mechanisms leading to the anisotropy changes.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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Time‐resolved K err‐effect and Spin Dynamics in Itinerant Ferromagnets

Koopmans

2007

Handbook of Magnetism and Advanced Magnetic Materials

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The availability of femtosecond pulsed‐laser sources in combination with the development of time‐resolved and sensitive magneto‐optical schemes, have paved the way toward the exploration of the dynamics of spin systems at ultimate time scales. This chapter focuses on the exploration of subpicosecond processes in itinerant ferromagnet systems, which after a decade of research has now become an exciting and mature field of research. Both the potential and limitations of the experimental techniques, mostly concentrating on all‐optical approaches, and the subtle relation with processes being probed are being explained. The main part, though, is devoted to a review of experimental efforts and the physical insight that has emerged for the complementary spin‐dependent processes being investigated: populational dynamics (including state‐filling effects such as dichroic bleaching and direct transfer of angular momentum from the laser field), loss of magnetic order after laser heating, laser‐induced modification of anisotropy (including dynamics of exchange‐coupled systems)–triggering precessional phenomena, and the very recently discovered possibility to generate magnetic order at ultrafast timescales by driving metamagnetic phase transitions.

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