Title :

Characterizing most irregular small-scale structures in turbulence using local Hölder exponents

Author(s) :

Nguyen, F. [Auteur]
Université de Lille
Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet [LMFL]
Laval, Jean-Philippe [Auteur]
Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet [LMFL]
Dubrulle, B. [Auteur]
CEA- Saclay [CEA]
Centre National de la Recherche Scientifique [CNRS]
Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]

Journal title :

Physical Review E

Pages :

063105

Publisher :

American Physical Society (APS)

Publication date :

2020-12-11

ISSN :

2470-0045

HAL domain(s) :

Physique [physics]

English abstract : [en]

Abstract Non-collinear spin textures in ferromagnetic ultrathin films are attracting a renewed interest fueled by possible fine engineering of several magnetic interactions, notably the interfacial Dzyaloshinskii-Moriya ...
Show more >Abstract Non-collinear spin textures in ferromagnetic ultrathin films are attracting a renewed interest fueled by possible fine engineering of several magnetic interactions, notably the interfacial Dzyaloshinskii-Moriya interaction. This allows for the stabilization of complex chiral spin textures such as chiral magnetic domain walls (DWs), spin spirals, and magnetic skyrmions among others. We report here on the behavior of chiral DWs at ultrashort timescale after optical pumping in perpendicularly magnetized asymmetric multilayers. The magnetization dynamics is probed using time-resolved circular dichroism in x-ray resonant magnetic scattering (CD-XRMS). We observe a picosecond transient reduction of the CD-XRMS, which is attributed to the spin current-induced coherent and incoherent torques within the continuously varying spin texture of the DWs. We argue that a specific demagnetization of the inner structure of the DW induces a flow of spins from the interior of the neighboring magnetic domains. We identify this time-varying change of the DW texture shortly after the laser pulse as a distortion of the homochiral Néel shape toward a transient mixed Bloch-Néel-Bloch texture along a direction transverse to the DW.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Laboratoire de Mécanique des Fluides de Lille Kampé de Fériet (LMFL) - UMR 9014

Source :

Harvested from HAL