Translational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 x 1 Surface at 9 K

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TitreTranslational Manipulation of Magnetic Cobalt Adatoms on the Si(100)-2 x 1 Surface at 9 K
Type de publicationJournal Article
Year of Publication2019
AuteursYengui M, Duyerger E, Sonnet P, Riedel D
JournalJOURNAL OF PHYSICAL CHEMISTRY C
Volume123
Pagination26415-26423
Date PublishedOCT 31
Type of ArticleArticle
ISSN1932-7447
Résumé

The controlled motion of magnetic impurities on semiconductor (SC) surfaces is of crucial importance for atomic scale magnetic devices. Still challenging because of their strong reactivity with SCs, magnetic impurities are usually studied in bulk SCs, thus preventing their manipulation. Here, we show that a single Co adatom can be steadied on the bare Si(100)-2 X 1 surface in a pedestal configuration at low temperature, 9 K, and moved along the reconstructed silicon dimer rows via the use of a scanning tunneling microscope. The electronic characteristics of the Co adatom and its surroundings are investigated via topography and dI/dV measurements. Our findings reveal that the Si Co bonding involves hybridization between the Si-p and the Co-p(x)p(y) orbitals. This configuration indicates that the Co-d orbitals remain weakly hybridized with the silicon atoms. These results are supported by density functional theory calculations where the role of the As dopant is discussed as well as the surface reconstruction. Therefore, we show that the motion direction of the Co adatom can be influenced by the surrounding c(4 X 2) or p(2 X 2) surface reconstruction phases, thus opening future interesting magnetic applications.

DOI10.1021/acs.jpcc.9b07951