Half-metallicity and magnetism of GeTe doped with transition metals V, Cr, and Mn: A theoretical study from the viewpoint of application in spintronics

Half-metallicity and magnetism of GeTe doped with transition metals V, Cr, and Mn: A theoretical study from the viewpoint of application in spintronics
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过渡金属V、Cr、Mn掺杂GeTe的半金属性和磁性:从自旋电子学应用角度进行理论研究

DOI:
10.1063/1.4750031
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发表时间:
2012-09
期刊:
J. Appl. Phys.
影响因子:
--
通讯作者:
刘永
刘永
中科院分区:
其他
文献类型:
--
作者:
刘永

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本文从自旋电子学潜在应用的角度出发,研究了三维过渡金属V、Cr、Mn掺杂的化合物GeTe的磁性。我们报道了这些三元化合物在岩盐和闪锌矿结构中的电子结构、磁性和内聚性的系统的密度泛函研究。在这两种情况下,都是Ge亚晶格掺杂了这三种过渡金属。其中一些化合物在其优化的晶胞体积下被发现是半金属的。对于这些特殊的情况,我们计算了交换相互作用和居里温度,以便为实验工作者提供一些理论指导,试图制备适合于自旋电子器件的材料。将我们的结果与现有的实验研究相联系的讨论将在适用和适当的时候提供。详细讨论了掺锰情况下实验观测结果与理论结果之间的明显差异,指出了掺锰过程中存在的问题。
This work presents results for the magnetic properties of the compound GeTe doped with 3d transition metals V, Cr, and Mn from the viewpoint of potential application in spintronics. We report a systematic density-functional study of the electronic structure, magnetic and cohesive properties of these ternary compounds in both rock salt and zinc blende structures. In both cases, it is the Ge sublattice that is doped with the three transition metals. Some of these compounds are found to be half-metallic at their optimized cell volumes. For these particular cases, we calculate both exchange interactions and the Curie temperatures in order to provide some theoretical guidance to experimentalists trying to fabricate materials suitable for spintronic devices. Discussions relating our results to the existing experimental studies are provided whenever applicable and appropriate. Apparent discrepancy between experimental observations and our theoretical result for the case of Mn-doping is discussed in detail, point...
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