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

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

doi:10.1016/S0022-0728(99)00173-4

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

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

Research output: Contribution to journal › Conference article › peer-review

76 Citations (Scopus)

Abstract

The magnetic properties and photo-magnetic effects of the electrochemically prepared metal polycyanide film, Fe_1.5^II[Cr^III(CN)₆]·7.5H₂O, were investigated. Magnetization measurements showed that it was a ferromagnet (parallel spin ordering) having a T_c = 21 K. The spontaneous magnetization decreased optically by the photoexcitation of the intervalence transfer (IT) band between Fe^II and Cr^III. 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 Fe^II and Cr^III 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 language	English
Pages (from-to)	245-249
Number of pages	5
Journal	Journal of Electroanalytical Chemistry
Volume	473
Issue number	1
DOIs	https://doi.org/10.1016/S0022-0728(99)00173-4
Publication status	Published - 1999 Sept 8
Externally published	Yes
Event	Proceedings of the 1998 International Symposium on Electrochemistry of Ordered Interfaces - Sapporo, Jpn Duration: 1998 Sept 11 → 1998 Sept 12

ASJC Scopus subject areas

Analytical Chemistry
Chemical Engineering(all)
Electrochemistry

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title = "Magnetic properties and optical control of electrochemically prepared iron-chromium polycyanides",

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.",

author = "Ohkoshi, {Shin Ichi} and Yasuaki Einaga and Akira Fujishima and Kazuhito Hashimoto",

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AU - Ohkoshi, Shin Ichi

AU - Einaga, Yasuaki

AU - Fujishima, Akira

AU - Hashimoto, Kazuhito

PY - 1999/9/8

Y1 - 1999/9/8

N2 - 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.

AB - 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.

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ER -

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

Abstract

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