Molecular nanomagnets

D.N. Hendrickson, J. Yoo, E.M. Rumberger, S.M.J. Aubin, Z. Sun, G. Christou, E.K. Brechin, G. Aromi, H. Ishimoto, A. Yamaguchi

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum mechanical tunneling of the direction of magnetization is discussed for several examples of single-molecule magnets (SMM's). Magnetization tunneling is described for two crystallographically different forms of [Mn O (O CC H -p-Me) (H O) ] solvate. The two Mn complexes are isomers. The magnetization versus magnetic field hysteresis loops are quite different for the two isomeric Mn complexes. One Mn complex exhibits a magnetization hysteresis loop that is characteristic of considerably faster magnetization tunneling than in the other Mn isomer. The unusual orientation of Jahn-Teller elongation axes in one isomer leads to greater rhombic zero-field splitting that is the origin of the faster magnetization tunneling. In addition to data for Mn complexes, magnetization relaxation rate versus temperature responses of three mixed-valence Mn complexes are also reported. In all three cases the Arrhenius plot of the logarithm of the magnetization relaxation rate versus the inverse absolute temperature shows a temperature-independent region as well as a temperature-dependent region. The temperature-independent relaxation rate is definitive evidence of magnetization tunneling in the lowest-energy zero-field component of the ground state.
Original languageEnglish
Pages (from-to)301-313
Number of pages13
JournalMolecular Crystals and Liquid Crystals Science and Technology - Section A: Molecular Crystals and Liquid Crystals
Volume376
DOIs
Publication statusPublished - 1 Jan 2002

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