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Coercive Fields Above 6 T in Two Cobalt(II)-Radical Chain Compounds
Xiaoqing Liu1, Xiaowen Feng2, Katie R Meihaus2
1Key Laboratory of Advanced Energy Materials Chemistry (MOE), Renewable Energy Conversion and Storage Center, College of Chemistry, Nankai University, Tianjin, 300071, China.
Researchers developed novel one-dimensional cobalt(II) systems as potential lanthanide-free hard magnets. These single-chain magnets exhibit record high coercive fields, offering a promising alternative for magnetic applications.
Area of Science:
- Materials Science
- Solid State Physics
- Chemistry
Background:
- Lanthanide-based magnets face supply chain and cost challenges.
- Lanthanide-free magnetic materials are actively sought.
- One-dimensional magnetic materials offer unique properties and synthesis routes.
Purpose of the Study:
- To synthesize and characterize novel one-dimensional cobalt(II) systems.
- To investigate their potential as lanthanide-free hard magnets.
- To understand the origin of their magnetic properties, particularly coercivity.
Main Methods:
- Synthesis of cobalt(II) systems with nitronyl nitroxide radicals.
- Magnetic measurements including hysteresis loops.
- Spectroscopic and computational studies.
Main Results:
- Two one-dimensional cobalt(II) systems, Co(hfac)2(R-NapNIT), were successfully synthesized.
- These compounds function as single-chain magnets below 14 K.
- Record high coercive fields (up to 102 kOe) were observed, attributed to inter-chain interactions.
Conclusions:
- The synthesized materials demonstrate potential as high-performance, lanthanide-free hard magnets.
- Inter-chain interactions, not 3D ordering, are key to the observed giant coercivities.
- These findings open new avenues for designing advanced magnetic materials.
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