Structure and random anisotropy in single-phase Ni nanocrystals

Structure and random anisotropy in single-phase Ni nanocrystals
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单相镍纳米晶的结构和随机各向异性

DOI:
10.1063/1.2188597
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发表时间:
2006
影响因子:
4
通讯作者:
N. Ikeda
N. Ikeda
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
E. Kita;N. Tsukuhara;Hidenori Sato;K. Ota;Hideto Yangaihara;H. Tanimoto;N. Ikeda

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我们采用气体冷凝和沉积方法制备了高纯度无氧单相镍纳米晶体,以检查随机各向异性模型(RAM)。所制备样品的晶粒尺寸估计为 8-10nm。热退火将晶粒尺寸 (D) 增大至 22 nm。对于在塑料和 KBr 单晶基底上制备的样品,获得了矫顽力与小于 13 nm 晶粒尺寸的明显 D6 依赖性。对于较大的晶粒尺寸,Hc 随着 D−1 的增加而降低,这些结果明显符合单元素纳米晶体系统中的 RAM。根据 D6 关系的斜率和 D=13nm 处的 Hc 峰值估计局部各向异性常数。
We prepared high-purity oxygen-free and single-phase Ni nanocrystals using the gas condensation and deposition method in order to examine the random anisotropy model (RAM). The grain size of an as-prepared sample was estimated to be 8–10nm. Thermal annealing increased grain sizes (D) up to 22nm. Clear D6 dependence of the coercive force on a grain size smaller than 13 nm was obtained for samples prepared on both plastic and KBr single-crystal substrates. For larger grain sizes, Hc decreased with D−1 and these results clearly conform to the RAM in single-element nanocrystal systems. A local anisotropy constant was estimated from the slope of the D6 relation and the peak of Hc at D=13nm.
DOI: --
发表时间: 2002
期刊: Phys.Rev.B 66
影响因子: --
作者:
S.Saksi;H.Tanimoto;E.Kita;H.Mizubayashi
通讯作者: H.Mizubayashi