Journal Article

FZJ-2016-01602

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Absence of a spin-signature from a single Ho adatom as probed by spin-sensitive tunneling

Steinbrecher, M. (Corresponding author) ; Sonntag, A. ; dos Santos Dias, M.FZJ* ; Bouhassoune, M.FZJ* ; Lounis, S. (Corresponding author)FZJ* ; Wiebe, J. ; Wiesendanger, R. ; Khajetoorians, A. A.

2016
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/9863  doi:10.1038/ncomms10454

Abstract: Whether rare-earth materials can be used as single-atom magnetic memory is an ongoing debate in recent literature. Here we show, by inelastic and spin-resolved scanning tunnelling-based methods, that we observe a strong magnetic signal and excitation from Fe atoms adsorbed on Pt(111), but see no signatures of magnetic excitation or spin-based telegraph noise for Ho atoms. Moreover, we observe that the indirect exchange field produced by a single Ho atom is negligible, as sensed by nearby Fe atoms. We demonstrate, using ab initio methods, that this stems from a comparatively weak coupling of the Ho 4f electrons with both tunnelling electrons and substrate-derived itinerant electrons, making both magnetic coupling and detection very difficult when compared to 3d elements. We discuss these results in the context of ongoing disputes and clarify important controversies.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IAS-1)
2. Quanten-Theorie der Materialien (PGI-1)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 142 - Controlling Spin-Based Phenomena (POF3-142) (POF3-142)

Appears in the scientific report 2016

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