An NCN-pincer ligand dysprosium single-ion magnet showing magnetic relaxation via the second excited state

Yun Nan Guo; Liviu Ungur; Garrett E. Granroth; Annie K. Powell; Chunji Wu; Stephen E. Nagler; Jinkui Tang; Liviu F. Chibotaru; Dongmei Cui

doi:10.1038/srep05471

An NCN-pincer ligand dysprosium single-ion magnet showing magnetic relaxation via the second excited state

Yun Nan Guo, Liviu Ungur, Garrett E. Granroth, Annie K. Powell, Chunji Wu, Stephen E. Nagler, Jinkui Tang, Liviu F. Chibotaru, Dongmei Cui

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137 Scopus citations

Abstract

Single-molecule magnets are compounds that exhibit magnetic bistability purely of molecular origin. The control of anisotropy and suppression of quantum tunneling to obtain a comprehensive picture of the relaxation pathway manifold, is of utmost importance with the ultimate goal of slowing the relaxation dynamics within single-molecule magnets to facilitate their potential applications. Combined ab initio calculations and detailed magnetization dynamics studies reveal the unprecedented relaxation mediated via the second excited state within a new DyNCN system comprising a valence-localized carbon coordinated to a single dysprosium(III) ion. The essentially C_2v symmetry of the Dy^III ion results in a new relaxation mechanism, hitherto unknown for mononuclear Dy^III complexes, opening new perspectives for means of enhancing the anisotropy contribution to the spin-relaxation barrier.

Original language	English
Article number	5471
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep05471
State	Published - Jun 27 2014

Funding

This work was supported by the National Natural Science Foundation of China (21221061, 21301136, 21371166 and 21331003). Work at the ORNL Spallation Neutron Source is supported by the US Department of Energy Basic Energy Sciences Scientific User Facilities Division. L.U. is a postdoc of the FWO–Vlaanderen (Flemish Science Foundation). INPAC and Methusalem projects of the KU Leuven are also gratefully acknowledged. We also thank Dr. Yupeng Pan, Dr. Yang Wang and Dr. Wei Zhao for the help in preparation of sample and fruitful discussions.

Funders	Funder number
US Department of Energy Basic Energy Sciences Scientific User Facilities Division
Oak Ridge National Laboratory
National Natural Science Foundation of China	21301136, 21371166, 21331003, 21221061

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title = "An NCN-pincer ligand dysprosium single-ion magnet showing magnetic relaxation via the second excited state",

abstract = "Single-molecule magnets are compounds that exhibit magnetic bistability purely of molecular origin. The control of anisotropy and suppression of quantum tunneling to obtain a comprehensive picture of the relaxation pathway manifold, is of utmost importance with the ultimate goal of slowing the relaxation dynamics within single-molecule magnets to facilitate their potential applications. Combined ab initio calculations and detailed magnetization dynamics studies reveal the unprecedented relaxation mediated via the second excited state within a new DyNCN system comprising a valence-localized carbon coordinated to a single dysprosium(III) ion. The essentially C2v symmetry of the DyIII ion results in a new relaxation mechanism, hitherto unknown for mononuclear DyIII complexes, opening new perspectives for means of enhancing the anisotropy contribution to the spin-relaxation barrier.",

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AU - Guo, Yun Nan

AU - Ungur, Liviu

AU - Granroth, Garrett E.

AU - Powell, Annie K.

AU - Wu, Chunji

AU - Nagler, Stephen E.

AU - Tang, Jinkui

AU - Chibotaru, Liviu F.

AU - Cui, Dongmei

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AB - Single-molecule magnets are compounds that exhibit magnetic bistability purely of molecular origin. The control of anisotropy and suppression of quantum tunneling to obtain a comprehensive picture of the relaxation pathway manifold, is of utmost importance with the ultimate goal of slowing the relaxation dynamics within single-molecule magnets to facilitate their potential applications. Combined ab initio calculations and detailed magnetization dynamics studies reveal the unprecedented relaxation mediated via the second excited state within a new DyNCN system comprising a valence-localized carbon coordinated to a single dysprosium(III) ion. The essentially C2v symmetry of the DyIII ion results in a new relaxation mechanism, hitherto unknown for mononuclear DyIII complexes, opening new perspectives for means of enhancing the anisotropy contribution to the spin-relaxation barrier.

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An NCN-pincer ligand dysprosium single-ion magnet showing magnetic relaxation via the second excited state

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