Magnetic properties and optical control of electrochemically prepared iron-chromium polycyanides

Shin Ichi Ohkoshi, Yasuaki Einaga, Akira Fujishima, Kazuhito Hashimoto

Research output: Contribution to journalConference article

65 Citations (Scopus)

Abstract

The magnetic properties and photo-magnetic effects of the electrochemically prepared metal polycyanide film, Fe1.5II[CrIII(CN)6]·7.5H2O, were investigated. Magnetization measurements showed that it was a ferromagnet (parallel spin ordering) having a Tc = 21 K. The spontaneous magnetization decreased optically by the photoexcitation of the intervalence transfer (IT) band between FeII and CrIII. This optically reduced magnetization persisted for a period of several days at 5 K after turning off the light. 57Fe Moessbauer experiments showed that the spin state of iron did not change but the strength of a ferromagnetic interaction between FeII and CrIII decreased after the irradiation, forming a paramagnetic metastable state. This metastable state returned to the original state above 40 K, showing that the magnetization of this compound can be controlled reversibly by the combination of optical and thermal methods.

Original languageEnglish
Pages (from-to)245-249
Number of pages5
JournalJournal of Electroanalytical Chemistry
Volume473
Issue number1
DOIs
Publication statusPublished - 1999 Sep 8
EventProceedings of the 1998 International Symposium on Electrochemistry of Ordered Interfaces - Sapporo, Jpn
Duration: 1998 Sep 111998 Sep 12

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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