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Light-induced spin-crossover magnet.

Shin-Ichi Ohkoshi1, Kenta Imoto, Yoshihide Tsunobuchi

  • 1Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. ohkoshi@chem.s.u-tokyo.ac.jp

Nature Chemistry
|June 24, 2011
PubMed
Summary

Researchers achieved long-range magnetic ordering in a metal-organic framework using light. This light-induced excited spin-state trapping effect in iron sites leads to spontaneous magnetization in the spin-crossover magnet.

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Area of Science:

  • Materials Science
  • Chemistry
  • Condensed Matter Physics

Background:

  • Light-induced spin-state transitions (low-spin/high-spin) in transition metals are key phenomena.
  • Previous light-induced magnetic ordering relied on intermetallic charge transfer mechanisms.
  • Spontaneous magnetization in extended systems requires magnetic ordering of high-spin sites.

Purpose of the Study:

  • To investigate light-induced long-range magnetic ordering in a metal-organic framework.
  • To explore an alternative mechanism for light-induced ordering: excited spin-state trapping.
  • To characterize the magnetic properties of the Fe-Nb-based spin-crossover magnet.

Main Methods:

  • Utilized a metal-organic framework containing Fe(II) sites.
  • Employed light irradiation to induce excited spin-state trapping.
  • Investigated magnetic ordering and phase transitions using magnetic measurements.

Main Results:

  • Achieved long-range magnetic ordering of extended Fe(II)(HS) sites via light-induced excited spin-state trapping.
  • Observed a strong superexchange interaction between photo-produced Fe(II)(HS) and neighboring Nb(IV) atoms through CN bridges.
  • Identified a magnetic phase transition at 20 K with a coercive field of 240 Oe.

Conclusions:

  • Demonstrated a novel mechanism for light-induced magnetic ordering in extended systems.
  • The Fe-Nb-based material functions as a spin-crossover magnet with photo-induced ordering.
  • This work opens new avenues for light-controllable magnetic materials.