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Instruments / Technical Area	Publication Details	Published	Actions
	Ultrafast time-evolution of chiral Néel magnetic domain walls probed by circular dichroism in x-ray resonant magnetic scattering Cyril Leveille , Erick Burgos-Parra , Yanis Sassi , Fernando Ajejas , Valentin Chardonnet , Emanuele Pedersoli , Flavio Capotondi , Giovanni De Ninno , Francesco Maccherozzi , Sarnjeet Dhesi , David M. Burn , Gerrit Van Der Laan , Oliver S. Latcham , Andrey V. Shytov , Volodymyr V. Kruglyak , Emmanuelle Jal , Vincent Cros , Jean-Yves Chauleau , Nicolas Reyren , Michel Viret , Nicolas Jaouen Nature Communications 13 DOI: 10.1038/s41467-022-28899-0 Open Access Show Abstract ▼ 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.	Mar 2022
I10-Beamline for Advanced Dichroism - scattering	Robust perpendicular skyrmions and their surface confinement Shilei Zhang , David M. Burn , Nicolas Jaouen , Jean-Yves Chauleau , Amir A. Haghighirad , Yizhou Liu , Weiwei Wang , Gerrit Van Der Laan , Thorsten Hesjedal Nano Letters DOI: 10.1021/acs.nanolett.9b05141 Diamond Proposal Number(s): [17612] Open Access Show Abstract ▼ Abstract: Magnetic skyrmions are two-dimensional magnetization swirls that stack in the form of tubes in the third dimension and which are proposed as prospective information carriers for nonvolatile memory devices due to their unique topological properties. From resonant elastic X-ray scattering measurements on Cu2OSeO3 with an in-plane magnetic field, we find that a state of perpendicularly ordered skyrmions forms, in stark contrast to the well-studied bulk state. The surface state is stable over a wide temperature range, unlike the bulk state in out-of-plane fields which is confined to a narrow region of the temperature-field phase diagram. In contrast to ordinary skyrmions found in the bulk, the surface state skyrmions result from the presence of magnetic interactions unique to the surface which stabilize them against external perturbations. The surface guiding makes the robust state particular interesting for racetracklike devices, ultimately allowing for much higher storage densities due to the smaller lateral footprint of the perpendicular skyrmions.	Jan 2020

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