Structural characterization and transport properties of ferromagnetic-semiconducting nano-wire hybrid structures for nano-spintronic device applications

该项目旨在研究具有明确簇性质的MnAs/GaAs和MnAs/InAs混合纳米线结构的结构，磁性和电学性质。采用选择性面积金属有机气相外延（SA-MOVPE）法制备了InAs或GaAs纳米线的杂化结构。在第二生长步骤中，铁磁性MnAs纳米团簇是在纳米线表面的内源性过程中形成的，而团簇的性质可以通过改变生长条件来系统地调节。利用磁输运和塞贝克测量研究了纳米团簇和共掺杂对杂化纳米线电学性能的影响，结果与纳米团簇的结构和磁性能相关。该项目的主要目标是对纳米团簇对潜在介观输运过程的影响有一个基本的了解，并评估这种杂化体未来在纳米磁电子和纳米自旋电子学领域的应用潜力。

The project aims at the investigation of structural, magnetic and electric properties of MnAs/GaAs and MnAs/InAs hybrid nanowire structures with well-defined cluster properties. The hybrid structures are fabricated by selective-area metal organic vapor phase epitaxy (SA-MOVPE) of InAs or GaAs nanowires. In a second growth step the ferromagnetic MnAs nanoclusters are formed during an endotaxy process on the facets of the nanowires, whereas the cluster properties can be tuned systematically by varying the growth conditions. The influence of the nanoclusters as well as of co-doping on the electrical properties of the hybrid nanowires is investigated using magnetotransport and Seebeck measurements and the results are correlated with the structural and magnetic properties of the MnAs nanoclusters. Major goal of the project is to obtain a fundamental understanding of the influence of the nanoclusters on the underlying mesoscopic transport processes and to evaluate the potential of such hybrids for future application in the field of nano-magnetoelectronics and nano-spintronics.