Ultrafast chiral dynamic probed by time-resolved X-ray resonant magnetic scattering

Cyril Leveille; Nicolas Jaouen; Erick Burgos-Parra; Yanis Sassi; Nicolas Reyren; Vincent Cros; Michel Viret; Jean-Yves Chauleau

doi:10.1117/12.2622276

30 May 2022 Ultrafast chiral dynamic probed by time-resolved X-ray resonant magnetic scattering

Cyril Leveille, Nicolas Jaouen, Erick Burgos-Parra, Yanis Sassi, Nicolas Reyren, Vincent Cros, Michel Viret, Jean-Yves Chauleau

Author Affiliations +

Proceedings Volume 12132, Advances in Ultrafast Condensed Phase Physics III; 1213208 (2022) https://doi.org/10.1117/12.2622276
Event: SPIE Photonics Europe, 2022, Strasbourg, France

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 the stabilization of complex chiral spin textures such as chiral magnetic domain walls (DWs), spin spirals, and magnetic skyrmions among others. The presentation will focus 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). In the first 2 picosecond, a transient reduction of the CD-XRMS asymmetry ratio is attributed to the spin current-induced coherent and incoherent torques within the continuously dependent spin texture of the DWs. On the one hand, this time-varying change of the DW texture shortly after the laser pulse is identified as a distortion of the homochiral Néel shape toward a transient mixed Bloch-Néel-Bloch texture along a direction transverse to the DW due to the coherent torque. On the other hand, the overall effect of the spin current incoherent torque results in an average loss of angular momentum that induces an increase of the spin relaxation processes within the DW at the ps timescale. It leads to a faster remagnetization inside the DWs compared to domains.

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Citation Download Citation

Cyril Leveille, Nicolas Jaouen, Erick Burgos-Parra, Yanis Sassi, Nicolas Reyren, Vincent Cros, Michel Viret, and Jean-Yves Chauleau "Ultrafast chiral dynamic probed by time-resolved X-ray resonant magnetic scattering", Proc. SPIE 12132, Advances in Ultrafast Condensed Phase Physics III, 1213208 (30 May 2022); https://doi.org/10.1117/12.2622276

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KEYWORDS

Magnetism

Scattering

X-rays

Ultrafast phenomena

Electrons

Picosecond phenomena

Ferromagnetics

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