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Peters L, Ghosh S, Sanyal B, et al. Magnetism and exchange interaction of small rare-earth clusters; Tb as a representative. Sci Rep. 2016;6:19676doi: 10.1038/srep19676.
Peters, L., Ghosh, S., Sanyal, B., van Dijk, C., Bowlan, J., de Heer, W., Delin, A., Di Marco, I., Eriksson, O., Katsnelson, M. I., Johansson, B., & Kirilyuk, A. (2016). Magnetism and exchange interaction of small rare-earth clusters; Tb as a representative. Scientific reports, 619676. https://doi.org/10.1038/srep19676
Peters, Lars, et al. "Magnetism and exchange interaction of small rare-earth clusters; Tb as a representative." Scientific reports vol. 6 (2016): 19676. doi: https://doi.org/10.1038/srep19676
Peters L, Ghosh S, Sanyal B, van Dijk C, Bowlan J, de Heer W, Delin A, Di Marco I, Eriksson O, Katsnelson MI, Johansson B, Kirilyuk A. Magnetism and exchange interaction of small rare-earth clusters; Tb as a representative. Sci Rep. 2016 Jan 22;6:19676. doi: 10.1038/srep19676. PMID: 26795239; PMCID: PMC4726341.
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Sci Rep. 2016 Jan 22;6:19676. doi: 10.1038/srep19676.

Magnetism and exchange interaction of small rare-earth clusters; Tb as a representative.

Scientific reports

Lars Peters, Saurabh Ghosh, Biplab Sanyal, Chris van Dijk, John Bowlan, Walt de Heer, Anna Delin, Igor Di Marco, Olle Eriksson, Mikhail I Katsnelson, Börje Johansson, Andrei Kirilyuk

Affiliations

  1. Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.
  2. School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.
  3. Department of Physics and Astronomy, Uppsala University, Box 516, 751?20 Uppsala, Sweden.
  4. Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
  5. Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany.
  6. School of Physics, Georgia Institute of Technology, 837 State Str., Atlanta, Georgia 30332, USA.
  7. Department of Materials and Nanophysics, School of Information and Communication Technology, Electrum 229, Royal Institute of Technology (KTH), SE-16440 Kista, Sweden.
  8. SeRC (Swedish e-Science Research Center), KTH, SE-10044 Stockholm, Sweden.
  9. Department of Theoretical Physics and Applied Mathematics, Ural Federal University, 620002 Ekaterinburg, Russia.

PMID: 26795239 PMCID: PMC4726341 DOI: 10.1038/srep19676

Abstract

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.

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