Coercive Fields Above 6 T in Two Cobalt(II)-Radical Chain Compounds

Xiaoqing Liu, Xiaowen Feng, Katie R. Meihaus, Xixi Meng, Yuan Zhang, Liang Li, Jun-Liang Liu, Kasper Steen Pedersen, Lukas Keller, Wei Shi, Yi-Quan Zhang, Peng Cheng, Jeffrey R. Long*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Lanthanide permanent magnets are widely used in applications ranging from nanotechnology to industrial engineering. However, limited access to the rare earths and rising costs associated with their extraction are spurring interest in the development of lanthanide-free hard magnets. Zero- and one-dimensional magnetic materials are intriguing alternatives due to their low densities, structural and chemical versatility, and the typically mild, bottom-up nature of their synthesis. Here, we present two one-dimensional cobalt(II) systems Co(hfac)2 (R-NapNIT) (R-NapNIT=2-(2'-(R-)naphthyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, R=MeO or EtO) supported by air-stable nitronyl nitroxide radicals. These compounds are single-chain magnets and exhibit wide, square magnetic hysteresis below 14 K, with giant coercive fields up to 65 or 102 kOe measured using static or pulsed high magnetic fields, respectively. Magnetic, spectroscopic, and computational studies suggest that the record coercivities derive not from three-dimensional ordering but from the interaction of adjacent chains that compose alternating magnetic sublattices generated by crystallographic symmetry.
Original languageEnglish
JournalAngewandte Chemie International Edition
Volume59
Pages (from-to)2-11
ISSN1433-7851
DOIs
Publication statusPublished - 2020

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