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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
Authors
Stanislav M. Avdoshenko
Valeriy Bezmelnitsyn
+11 more
Bernd Büchner
Sean Davis
Harry C. Dorn
Vasilii Dubrovin
James Duchamp
Paul Faust
Kyle Kirkpatrick
Denis S. Krylov
Alexey A. Popov
Lukas Spree
Georgios Velkos
Publication date
1 January 2019
Publisher
Weinheim : Wiley-VCH
Doi
Cite
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
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Last time updated on 23/07/2022