Highly ordered, half-metallic Co2FeSi single crystals
Highly ordered, half-metallic Co2FeSi single crystals
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DOI：
10.1063/1.3242370
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发表时间：
2009-10-19
影响因子：
4
通讯作者：
Swagten, H. J. M.
中科院分区：
文献类型：
--
作者：
Blum, C. G. F.;Jenkins, C. A.;Swagten, H. J. M.
在赫斯勒化合物中发现了多种性质，例如半金属性。为了分离内在和外在性质，需要高质量的单晶。在这里，我们报告了半金属铁磁体 Co2FeSi 的不同生长晶体。所有晶体均表现出优异的有序性，从而具有出色的电气性能、低残余电阻率和高残余电阻率比。所有 Co2FeSi 晶体的电阻率均低于 50 K，这可能表明具有半金属铁磁性。在 50 K 左右从这种不寻常的传输到更传统的传输（T-2 依赖性）的交叉表明自旋翻转散射的开始，因此对于理解 Co2FeSi 隧道磁阻器件的强温度依赖性是必不可少的。 (C) 2009 年美国物理研究所。 [号码：10.1063/1.3242370]
A wide variety of properties such as half-metallicity is found among Heusler compounds. In order to separate intrinsic and extrinsic properties, high quality single crystals are required. Here, we report on differently grown crystals of the half-metallic ferromagnet Co2FeSi. All crystals show excellent ordering, resulting in outstanding electrical behavior with low residual resistivity and high residual-resistivity-ratio. All Co2FeSi crystals show a plateau in the resistivity below 50 K, which might point to half-metallic ferromagnetism. The cross-over from this unusual to more conventional transport (T-2 dependence) around 50 K indicates the onset of spin flip scattering and thus is indispensable for understanding the strong temperature dependence of Co2FeSi tunneling magnetoresistance-devices. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3242370]