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Europium Cyclooctatetraene Nanowire Carpets: A Low-Dimensional, Organometallic, and Ferromagnetic Insulator
II. Physikalisches Institut, Universität zu Köln, Köln, Germany.
Fakultät für Physik, Universität Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), German.
II. Physikalisches Institut, Universität zu Köln, Köln, Germany.
Fakultät für Physik, Universität Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), German.
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2019 (English)In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 10, no 5, p. 911-917Article in journal (Refereed) Published
Abstract [en]

We investigate the magnetic and electronic properties of europium cyclooctatetraene (EuCot) nanowires by means of low-temperature X-ray magnetic circular dichroism (XMCD) and scanning tunneling microscopy (STM) and spectroscopy (STS). The EuCot nanowires are prepared in situ on a graphene surface. STS measurements identify EuCot as an insulator with a minority band gap of 2.3 eV. By means of Eu M5,4 edge XMCD, orbital and spin magnetic moments of (-0.1 ± 0.3)μB and (+7.0 ± 0.6)μB, respectively, were determined. Field-dependent measurements of the XMCD signal at the Eu M5 edge show hysteresis for grazing X-ray incidence at 5 K, thus confirming EuCot as a ferromagnetic material. Our density functional theory calculations reproduce the experimentally observed minority band gap. Modeling the experimental results theoretically, we find that the effective interatomic exchange interaction between Eu atoms is on the order of millielectronvolts, that magnetocrystalline anisotropy energy is roughly half as big, and that dipolar energy is approximately ten times lower.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 10, no 5, p. 911-917
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-72793DOI: 10.1021/acs.jpclett.8b03711ISI: 000461271700003PubMedID: 30717591Scopus ID: 2-s2.0-85061921184OAI: oai:DiVA.org:oru-72793DiVA, id: diva2:1291793
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

Funding Agencies:

eSSENCE

KAW foundation  2013.0020  2012.0031

DFG  WE 2623/17-1  MI 581/23-1 

Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)  278162697 - SFB 1242 

Institutional Strategy of the University of Cologne within the German Excellence Initiative  

BMBF  05K13KEA 

CAPES  9469/13-3 

Available from: 2019-02-26 Created: 2019-02-26 Last updated: 2019-06-19Bibliographically approved

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Eriksson, Olle

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