Visible-light-induced reversible photomagnetism in rubidium manganese hexacyanoferrate

Hiroko Tokoro, Tomoyuki Matsuda, Tomohiro Nuida, Yutaka Moritomo, Kenji Ohoyama, Edgard Davy Loutete Dangui, Kamel Boukheddaden, Shin Ichi Ohkoshi

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91 Citations (Scopus)

Abstract

The photoreversibility of a photoinduced phase transition was investigated in a rubidium manganese hexacyanoferrate, Rb 0.88 Mn[Fe(CN) 6 ] 0.96 .0.5H 2 0. The present material shows a charge-transfer phase transition from the Mn II -Fe III [high-temperature (HT)] phase to the Mn III -Fe II [low-temperature (LT)] phase, and the LT phase shows ferromagnetism. Spectroscopic ellipsometry measurements of the dielectric constant suggest that the optical transitions in the LT and HT phases are a metal-to-metal charge transfer (Fe II -Mn III ) band at 420-540 nm and a ligand-to-metal charge transfer (CN - → Fe III ) band of [Fe III (CN) 6 ] at 410 nm, respectively. By irradiation with 532 nm light, the LT phase is transmitted to the photoinduced (PI) phase, which has a valence state similar to that of the HT phase, and photodemagnetization is observed. In contrast, irradiating the PI phase with 410 ±30 nm light causes the reverse phase transition. Neutron powder diffraction measurement of an analogue compound, Rb 0.58 Mn[Fe(CN) 6 ] 0.86 ·2.3H 2 O, which does not show a charge-transfer phase transition and maintains the Mn II -Fe III phase at a very low temperature, confirms that the PI phase is an antiferromagnet. Hence, the present visible-light-induced reversible photomagnetic effect is due to optical switching between the ferromagnetic LT phase and the antiferromagnetic PI phase.

Original languageEnglish
Pages (from-to)423-428
Number of pages6
JournalChemistry of Materials
Volume20
Issue number2
DOIs
Publication statusPublished - 2008 Jan 22

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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