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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Ukleev V., Tarnavich V., Tartakovskaya E., Lott D., Kapaklis V., Oleshkevych A., Gargiani P., Valvidares M., White J. S., Grigoriev S. V.,
Project Discovery and Nanoengineering of Novel Skyrmion-hosting Materials
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 100(13)
Page(s) 134417 - 134417
Title of proceedings Physical Review B
DOI 10.1103/physrevb.100.134417

Abstract

Magnetic rare-earth/nonmagnetic metal superlattices are well-known to display chiral spin helices in the rare-earth layers that propagate coherently across the nonmagnetic layers. However, the underlying mechanism that preserves the magnetic phase and chirality coherence across the nonmagnetic layers has remained elusive. In this paper, 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 Å and a newly observed charge density wave with periodicity 16 Å that propagates through both the Ho and nonmagnetic Y layer. With x-ray circular magnetic dichroism measurements ruling out the existence of a magnetic proximity effect induced moment in the nonmagnetic 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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