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Cobalt(II) Single-Chain Magnet With Strong Anisotropy and Ferromagnetic IntraChain Coupling
Yongbing Shen1, Mengxing Cui2, Hiroyoshi Ohtsu3
1Department of Chemistry, School of Science, The University of Tokyo, Tokyo, Japan.
Abstract:
Co(II)-based coordination polymer is reported as a new benchmark single-chain magnet (SCM), exhibiting an energy barrier (Ueff) of 560 K and a blocking temperature (TB) of 21.5 K‒both the highest values observed for SCM systems. The magnetic behavior originates from the synergistic balance between strong axial anisotropy (DCo = -83 cm-1) and moderate ferromagnetic exchange (JCo-Co = +17.7 K), promoting long-range spin correlation over thousands of magnetic ions. Detailed analysis of the correlation length and domain-wall energy reveals a wide SCM regime and a 1D-to-3D magnetic crossover at low temperature. Unlike previously reported radical-bridged SCMs, this work demonstrates a clean, intrinsic design strategy for realizing extreme single-chain magnetism, offering new principles for developing robust molecular spin materials.
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