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Metal-organic magnets with large coercivity and ordering temperatures up to 242 degrees C

Perlepe, Panagiota; Oyarzabal, Itziar; Mailman, Aaron; Yquel, Morgane; Platunov, Mikhail; Dovgaliuk, Iurii; Rouzieres, Mathieu; Negrier, Philippe; Mondieig, Denise; Suturina, Elizaveta A.; Dourges, Marie-Anne; Bonhommeau, Sebastien; Musgrave, Rebecca A.; P

SCIENCE
2020
VL / 370 - BP / 587 - EP / 591
abstract
Magnets derived from inorganic materials (e.g., oxides, rare-earth-based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242 degrees C and a 7500-oersted room-temperature coercivity.

AccesS level

Green published, Green submitted, Green accepted

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