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Magnetism and exchange interaction of small rare-earth clusters: Tb as a representative
Radboud Univ Nijmegen, Inst Mol & Mat, Heyendaalseweg 135, NL-6525 AJ Nijmegen, Netherlands..
Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Univ Amsterdam, Vant Hoff Inst Mol Sci, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands..
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 19676Article in journal (Refereed) Published
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Abstract [en]

Here we follow, both experimentally and theoretically, the development of magnetism in Tb clusters from the atomic limit, adding one atom at a time. The exchange interaction is, surprisingly, observed to drastically increase compared to that of bulk, and to exhibit irregular oscillations as a function of the interatomic distance. From electronic structure theory we find that the theoretical magnetic moments oscillate with cluster size in exact agreement with experimental data. Unlike the bulk, the oscillation is not caused by the RKKY mechanism. Instead, the inter-atomic exchange is shown to be driven by a competition between wave-function overlap of the 5d shell and the on-site exchange interaction, which leads to a competition between ferromagnetic double-exchange and antiferromagnetic super-exchange. This understanding opens up new ways to tune the magnetic properties of rare-earth based magnets with nano-sized building blocks.

Place, publisher, year, edition, pages
2016. Vol. 6, 19676
National Category
Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-277789DOI: 10.1038/srep19676ISI: 000368685800001PubMedID: 26795239OAI: oai:DiVA.org:uu-277789DiVA: diva2:905792
Funder
Swedish Research CouncilCarl Tryggers foundation Knut and Alice Wallenberg FoundationEU, European Research Council
Available from: 2016-02-23 Created: 2016-02-23 Last updated: 2017-11-30Bibliographically approved

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Sanyal, BiplabDelin, AnnaDi Marco, IgorEriksson, OlleJohansson, Börje

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