Spin polarization of magnetoresistive materials by point contact spectroscopy
Spin polarization of magnetoresistive materials by point contact spectroscopy
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DOI：
10.1103/physrevb.68.024403
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发表时间：
2003-07
影响因子：
3.7
通讯作者：
N. Auth;G. Jakob;T. Block;C. Felser
中科院分区：
文献类型：
--
作者：
N. Auth;G. Jakob;T. Block;C. Felser
在寻求一种直接确定自旋极化的方法的过程中，对点接触结中Andreev反射过程的分析引起了人们极大的兴趣。然而，在这个方案中的运输自旋极化anevaluation的先决条件是弹性（弹道或扩散）运输的存在，这是不能假定的先验。因此，我们还包括非弹性过程在我们的分析和计算，热效应可以有显着的影响数据评估。作为具有预测的半金属行为和低电导率的铁磁样品，我们使用了双钙钛矿Sr2 FeMoO6薄膜和Heusler化合物Co2 Cr 0的体材料。6 Fe 0 . 4 Al。
In the strive to find a straightforward method for determining the spin polarization, the analysis of the Andreev reflection process in point contact junctions has attracted much interest. However, the prerequisite for anevaluation of the transport spin polarization in this scheme is the existence of elastic (ballistic or diffusive) transport, which cannot be assumed a priori. We therefore also include inelastic processes in our analysis and exemplify that thermal effects can have a significant effect on data evaluation. As ferromagnetic samples with a predicted half metallic behavior and comparably low conductivity we used thin films of the double perovskite Sr 2 FeMoO 6 and bulk material of the Heusler compound Co 2 Cr 0 . 6 Fe 0 . 4 Al.