Magnetic properties of 2D Ising mesoscopic ferromagnet Ni(OH)2 monolayer nanoclusters
Magnetic properties of 2D Ising mesoscopic ferromagnet Ni(OH)2 monolayer nanoclusters
复制标题
二维伊辛介观铁磁体 Ni(OH)2 单层纳米团簇的磁性能
DOI：
10.1016/s0304-8853(97)00970-0
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发表时间：
1998
影响因子：
2.7
通讯作者：
Y. Kimishima
中科院分区：
文献类型：
--
作者：
Y. Ichiyanagi;Y. Kimishima
采用NiCl 2·6 H2O和Na 2SiO 3·9 H2O混合水溶液的湿法制备了Ni（OH）2单层纳米团簇（Ni-MNC）。用Hartshorn电桥法测量了Ni-MNC在a-SiO2中在4 ~ 40 K、98 ~ 8 kHz范围内的交流磁化率。利用AC χ′和χ Mobi ′的Cole-Cole图，估算了静态χ、平均弛豫时间τ AV。从场冷磁化MFC的时间衰减导出的磁粘度S与1/τAV表现出类似的行为。铁磁转变温度Tc和量子介观隧穿温度tQ的接近值可能反映了二维伊辛铁磁介观系统的特征。
Ni(OH)2monolayer nanoclusters (Ni-MNC) in amorphous SiO2were prepared by the wet method by mixing of NiCl2· 6H2O and Na2SiO3· 9H2O aqueous solutions. The AC magnetic susceptibilities of Ni-MNC in a-SiO2were measured between 4 K and 40 K from 98 Hz to 8 kHz by Hartshorn bridge method. By the Cole-Cole plots for AC χ′ and χ′', the static χ, averaged relaxation time τAVwas estimated. The magnetic viscosity S, derived from time decay of field cooled magnetization MFC, showed similar behavior with 1/τAV. The close value of ferromagnetic transition temperature Tcand quantum mesoscopic tunneling temperature tQmight mean the characteristic of 2D Ising ferromagnetic mesoscopic system.