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arXiv · 1909.12372

Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering

V. Ukleev·V. Tarnavich·E. Tartakovskaya·D. Lott·V. Kapaklis·A. Oleshkevych·P. Gargiani·M. Valvidares·J. S. White·S. V. Grigoriev
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Abstract

Magnetic rare-earth / non-magnetic metal superlattices are well-known to display chiral spin helices in the rare-earth layers that propagate coherently across the non-magnetic layers. However, the underlying mechanism that preserves the magnetic phase and chirality coherence across the non-magnetic layers has remained elusive. In this Letter, we use resonant and element-specific x-ray scattering to evidence directly the formation of two fundamentally different long-range modulations in a Holmium/Yttrium (Ho/Y) multilayer: the known Ho chiral spin helix with periodicity 25 {\AA}, and a newly observed charge density wave with periodicity 16 {\AA} that propagates through both the Ho and non-magnetic Y layer. With x-ray circular magnetic dichroism measurements ruling out the existence of a magnetic proximity effect induced moment in the non-magnetic Y layers, we propose that the charge density wave is also chiral, thus providing the means for the transmittance of magnetic chirality coherence between Ho layers.

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V. Ukleev, V. Tarnavich, E. Tartakovskaya, D. Lott, V. Kapaklis, A. Oleshkevych, P. Gargiani, M. Valvidares, J. S. White, S. V. Grigoriev. 2019-09-26. Coherent charge and magnetic ordering in Ho/Y superlattice revealed by element-selective x-ray scattering. https://doi.org/10.1103/physrevb.100.134417

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