Soft x-ray (coherent) scattering for magnetic studies

by Nicolas Jaouen (SEXTANTS beamline, Synchrotron SOLEIL, France When Apr 18, 2018 from 12:00 PM to 01:00 PM (Europe/Madrid / UTC200) Where Marie Curie Briefing Room Contact Name Inma Hernández Contact Phone 935924389 Attendees NOTE: If you are interested in attending, please contact Inma Hernández with your Identity Card number and name to obtain the ALBA access. Add event to calendar iCal ABSTRAC)

Wednesday, 18 April 2018 from to (UTC)
at ALBA Synchrotron ( Marie Curie Briefing room )
Carrer de la Llum 2-26 08290 Cerdanyola del Vallès (Barcelona)


Many current forthcoming applications of magnetic materials involve heterostructures or alloys containing magnetic and non-magnetic elements. X-ray Resonant (Coherent) Scattering is the technique of choice to probe such phenomena thanks to its element-selectivity and spatial sensitivity.

            In this presentation I will introduce the experimental set-up that we developed at SOLEIL and illustrate their capabilities. SEXTANTS [1] is a beamline of the SOLEIL synchrotron, covering the 50-1700eV energy range dedicated to soft x-ray scattering. The resolving power exceeds 104 and maximum flux on the sample ranges from 1×1014 (100 eV) to 2×1013 (1000 eV) ph./s/0.1% bw. The beamline main objective is the investigation of the electronic and magnetic properties of solids using three scattering techniques: resonant inelastic x-ray scattering (RIXS), x-ray resonant magnetic scattering (XRMS) and coherent x-ray scattering (CXS), the last one including also imaging via Fourier transform holography (FTH) [2].

In the second part, several recent results obtained at SEXTANTS beamline will be presented, and in particular I will show that XRMS is the tool to study magnetic chirality as illustrated with two systems: on one hand, Pt/Co multilayers in which Dzyaloshinskii-Morya interaction (DMI) is a induced by the inversion symmetry breaking at the Pt/Co interfaces [3,4] and on the other hand, an investigation we have done of BiFeO3 thin epitaxial layers [4,5] in which the “bulk” DMI plays a major role in its magnetic configuration and in particular in the stabilization of the antiferromagnetic cycloid.

In the last part I will present the latest development of resonant scattering and in particular how the use of the x-ray coherence available at modern light source allow nowadays to image the sample with a spatial resolution of few tens of nanometers and a time resolution ranging from ns down to fs timescale.


[1] M. Sacchi et al., Journal of Physics: Conference Series 425 (2013) 072018

[2] S. Eisebitt et al., Nature, 432, 885 (2004).

[3] J.Y. Chauleau, et al., Phys. Rev. Lett. 120, 037202 (2018).

[4] W. Legrand et al., submitted and https://arxiv.org/abs/1712.05978

[5] I. Gross et al., Nature 549, 252 (2017)