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      High Blocking Temperature of Magnetization and Giant Coercivity in the Azafullerene Tb 2@C 79N with a Single‐Electron Terbium–Terbium Bond

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          Abstract

          The azafullerene Tb 2@C 79N is found to be a single‐molecule magnet with a high 100‐s blocking temperature of magnetization of 24 K and large coercivity. Tb magnetic moments with an easy‐axis single‐ion magnetic anisotropy are strongly coupled by the unpaired spin of the single‐electron Tb−Tb bond. Relaxation of magnetization in Tb 2@C 79N below 15 K proceeds via quantum tunneling of magnetization with the characteristic time τ QTM=16 462±1230 s. At higher temperature, relaxation follows the Orbach mechanism with a barrier of 757±4 K, corresponding to the excited states, in which one of the Tb spins is flipped.

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          Giant exchange interaction in mixed lanthanides

          Veacheslav Vieru, Naoya Iwahara, Liviu Ungur … (2015)
          Combining strong magnetic anisotropy with strong exchange interaction is a long standing goal in the design of quantum magnets. The lanthanide complexes, while exhibiting a very strong ionic anisotropy, usually display a weak exchange coupling, amounting to only a few wavenumbers. Recently, an isostructural series of mixed Ln$^{3+}$-N$_2^{3-}$-Ln$^{3+}$ (Ln $=$ Gd, Tb, Dy, Ho, Er) have been reported, in which the exchange splitting is estimated to reach hundreds wavenumbers. The microscopic mechanism governing the unusual exchange interaction in these compounds is revealed here by combining detailed modeling with density-functional theory and {\it ab initio} calculations. We find it to be basically kinetic and highly complex, involving non-negligible contributions up to seventh power of total angular momentum of each lanthanide site. The performed analysis also elucidates the origin of magnetization blocking in these compounds. Contrary to general expectations the latter is not always favored by strong exchange interaction.
          Article 0 comments Cited 15 times – based on 0 reviews     Review now
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            Author and article information

            Contributors
            Prof. Dr. Harry C. Dorn:
            ORCID: http://orcid.org/0000-0002-3150-5314
            hdorn@vt.edu
            Dr. Alexey A. Popov:
            ORCID: http://orcid.org/0000-0002-7596-0378
            a.popov@ifw-dresden.de
            Journal
            Journal ID (nlm-ta): Angew Chem Int Ed Engl
            Journal ID (iso-abbrev): Angew. Chem. Int. Ed. Engl
            Journal ID (doi): 10.1002/(ISSN)1521-3773
            Journal ID (publisher-id): ANIE
            Title: Angewandte Chemie (International Ed. in English)
            Publisher: John Wiley and Sons Inc. (Hoboken )
            ISSN (Print): 1433-7851
            ISSN (Electronic): 1521-3773
            Publication date (Electronic): 27 March 2019
            Publication date (Print): 23 April 2019
            Volume: 58
            Issue: 18 ( doiID: 10.1002/anie.v58.18 )
            Pages: 5891-5896
            Affiliations
            [ 1 ] Leibniz Institute for Solid State and Materials Research Helmholtzstrasse 20 01069 Dresden Germany
            [ 2 ] Center for Quantum Nanoscience Institute for Basic Science (IBS) Seoul Republic of Korea
            [ 3 ] Department of Chemistry Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 USA
            [ 4 ] Luna nanoWorks, a Division of Luna Innovation Inc. 521 Bridge St Danville Virginia USA
            Author information
            http://orcid.org/0000-0002-3886-2680
            http://orcid.org/0000-0001-5839-3079
            http://orcid.org/0000-0002-3150-5314
            http://orcid.org/0000-0002-7596-0378
            Article
            Publisher ID: ANIE201900943
            DOI: 10.1002/anie.201900943
            PMC ID: 6519270
            PubMed ID: 30786125
            SO-VID: a4af4256-704a-4883-8cb3-dadb934a99de
            Copyright © © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
            License:

            This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

            History
            Date received : 23 January 2019
            Date revision received : 19 February 2019
            Page count
            Figures: 6, Tables: 0, References: 64, Pages: 6, Words: 0
            Funding
            Funded by: H2020 European Research Council
            Award ID: 648295
            Funded by: Deutsche Forschungsgemeinschaft
            Award ID: 1602/4-1
            Award ID: 1602/5-1
            Funded by: H2020 Marie Skłodowska-Curie Actions
            Award ID: 748635
            Categories
            Subject: Communication
            Subject: Communications
            Subject: Single‐Molecule Magnets | Hot Paper
            Custom metadata
            source-schema-version-number 2.0
            component-id anie201900943
            cover-date April 23, 2019
            details-of-publishers-convertor Converter:WILEY_ML3GV2_TO_NLMPMC version:5.6.2.1 mode:remove_FC converted:15.05.2019

            ScienceOpen disciplines: Chemistry
            Keywords: endohedral fullerenes,exchange coupling,metal–metal bonds,single-molecule magnets,terbium
            Data availability:
            ScienceOpen disciplines: Chemistry
            Keywords: endohedral fullerenes, exchange coupling, metal–metal bonds, single-molecule magnets, terbium

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