Photoinduced magnetization with a high curie temperature and a large coercive field in a cyano-bridged cobalt-tungstate bimetallic assembly.
Photoinduced magnetization with a high curie temperature and a large coercive field in a cyano-bridged cobalt-tungstate bimetallic assembly.
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DOI：
10.1021/ja060510e
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发表时间：
2006-03
影响因子：
15
通讯作者：
S. Ohkoshi;S. Ikeda;T. Hozumi;T. Kashiwagi;K. Hashimoto
中科院分区：
文献类型：
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作者：
S. Ohkoshi;S. Ikeda;T. Hozumi;T. Kashiwagi;K. Hashimoto
制备了三维磁性材料[{CoII(pyrimidine)(H2O)}2{CoII(H2O)2}{WV(CN)8}2](pyrimidine)2.2H2O。该化合物表现出电荷转移诱导的自旋转变和90K的大热滞回线，光照使低温相表现出居里温度为40K的自发磁化和12000G的矫顽场磁滞回线，这是已报道的光磁体的最高值。观察到的光致磁化是由于辐照使{CoIIhs(S=3/2)}{CoIIIls(S=0)}2-nc-{wiv(S=0)}2相向{CoIIhs(S=3/2)}3-nc-{wv(S=1/2)}2相的电荷转移相变。
A three-dimensional magnetic material [{CoII(pyrimidine)(H2O)}2{CoII(H2O)2}{WV(CN)8}2](pyrimidine)2. 2H2O is prepared. This compound exhibits a charge-transfer-induced spin transition with a large thermal hysteresis loop of 90 K. Irradiating with light causes the low-temperature phase to exhibit a spontaneous magnetization with a Curie temperature of 40 K and a magnetic hysteresis loop with a coercive field of 12 000 G, which is the highest value reported for a photomagnet. The observed photoinduced magnetization is due to the charge-transfer phase transition from the {CoIIhs(S = 3/2)}{CoIIIls(S = 0)}2-NC-{WIV(S = 0)}2 phase to the {CoIIhs(S = 3/2)}3-NC-{WV(S = 1/2)}2 phase by the irradiation.