Effect of reduced lateral dimensions on the optical and magnetic properties of dilute magnetic and antiferromagnetic nanowires

该项目的目标是合成扩展的、高度有序的磁性和非磁性半导体纳米线阵列。该项目是设在吉昂的贾斯图斯-利比希大学化学系的申请者小组(项目的A部分)和菲利普斯-马尔堡大学物理系的申请者小组(项目的B部分)之间的密切合作。基于(Ga，Mn)As和(Ga，Mn)P化合物的磁性纳米线薄膜将在Gieçen中合成。磁学、电磁场和磁光光谱研究将在马尔堡进行。磁性和非磁性半导体线阵列将通过将(Ga，Mn)As和(Ga，Mn)P掺杂到具有平行排列的管状孔或立方网状管状孔的介孔二氧化硅模板薄膜中来制备。孔径可以通过改变合成条件来调节。根据孔排列的类型，在掺入半导体后将获得非相互作用线或相互作用线。模板薄膜将在硅和玻璃衬底上合成。将通过磁光光谱和磁传输技术来研究金属丝系统的电、光和磁性质。在该项目的第一阶段，特征描述将具有旨在优化线阵的伴随特征。在优化之后，我们将致力于研究金属丝结构中的约束效应。从长远来看，我们希望把重点放在(Ga，Mn)As和(Ga，Mn)P丰富的磁性相图的修改上，这是由于尺寸的降低以及在磁电子和自旋电子器件中的可能应用。

It is the aim of the project to synthesise extended, highly ordered arrays of magnetic and nonmagnetic semiconductor nanowires. The project is a close cooperation between the group of the applicant at the Department of Chemistry of the Justus-Liebig University in Gießen (part A of the project) and the group of the applicants at the Department of Physics of the Philipps-University of Marburg (part B of the project). The films of magnetic nanowires based on (Ga,Mn)As and (Ga,Mn)P compounds will be synthesised in Gießen. The magnetic, galvanomagnetic and magneto-optical spectroscopic studies will be carried out in Marburg. The magnetic and nonmagnetic semiconductor wire arrays will be prepared by incorporating (Ga,Mn)As and (Ga,Mn)P into mesoporous SiO2 template films with either a parallel arrangement of tube-like pores or a cubic grid of tube-like pores. The pore diameter can be adjusted by varying the synthesis conditions. Depending on the type of pore arrangement either non-interacting wires or interacting wires will be obtained after incorporation of the semiconductor. The template films will be synthesised on Si as well as on glass substrates. The electronic, optical and magnetic properties of the wire systems will be studied by magneto-optical spectroscopy and magneto-transport techniques. At the first stage of the project the characterisation will have accompanying character aiming at optimising the wire arrays. After the optimisation, we will aim at studying confinement effects in the wire structures. In the long run we want to focus on modifications of the rich magnetic phase diagrams of (Ga,Mn)As and (Ga,Mn)P due to reduced dimensions and possible applications in magneto-electronic and spintronic devices.