TY - JOUR
T1 - Visible-light-induced reversible photomagnetism in rubidium manganese hexacyanoferrate
AU - Tokoro, Hiroko
AU - Matsuda, Tomoyuki
AU - Nuida, Tomohiro
AU - Moritomo, Yutaka
AU - Ohoyama, Kenji
AU - Dangui, Edgard Davy Loutete
AU - Boukheddaden, Kamel
AU - Ohkoshi, Shin Ichi
PY - 2008/1/22
Y1 - 2008/1/22
N2 -
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.
AB -
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.
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U2 - 10.1021/cm701873s
DO - 10.1021/cm701873s
M3 - Article
AN - SCOPUS:38949166748
VL - 20
SP - 423
EP - 428
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 2
ER -