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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
Author(s) -
Velkos Georgios,
Krylov Denis S.,
Kirkpatrick Kyle,
Spree Lukas,
Dubrovin Vasilii,
Büchner Bernd,
Avdoshenko Stanislav M.,
Bezmelnitsyn Valeriy,
Davis Sean,
Faust Paul,
Duchamp James,
Dorn Harry C.,
Popov Alexey A.
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201900943
Subject(s) - terbium , magnetization , condensed matter physics , coercivity , magnetic anisotropy , relaxation (psychology) , materials science , quantum tunnelling , remanence , chemistry , nuclear magnetic resonance , ion , physics , magnetic field , organic chemistry , quantum mechanics , social psychology , psychology
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.