IBS Publications Repository: High Blocking Temperature of Magnetization and Giant Coercivity in the Azafullerene Tb 2 @C 79 N with a Single-Electron Terbium

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

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

Author(s): Velkos G.; Krylov D.S.; Kirkpatrick K.; Spree L.; Dubrovin V.; Büchner B.; Avdoshenko S.M.; Bezmelnitsyn V.; Davis S.; Faust P.; Duchamp J.; Dorn H.C.; Popov A.A.

Subject: endohedral fullerenes, ; exchange coupling, ; metal–metal bonds, ; single-molecule magnets, ; terbium

Journal: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.58, no.18, pp.5891 - 5896

Abstract: The azafullerene Tb 2 @C 79 N 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 79 N 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. © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA