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MA: Fachverband Magnetismus
MA 23: Micro- and Nanostructured Magnetic Materials
MA 23.9: Talk
Wednesday, April 2, 2014, 11:45–12:00, HSZ 403
Transport Measurements on Individual Ferromagnetic MnAs Nanocluster Arrangements — •Martin Fischer1, Matthias T. Elm1, Shinya Sakita2, Shinjiro Hara2, and Peter J. Klar1 — 1I. Physikalisches Institut, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen — 2Research Center for Integrated Quantum Electronics, Hokkaido University, North 13 West 8, Sapporo, Japan 060-8628
The ongoing progress in the development of nano-magnetoelectronic devices is strongly connected to the exploration of novel, nanostructured magnetic materials. This contribution reports on transport measurements on ferromagnetic manganese arsenide nanoclusters and nanocluster arrangements grown by Selective-Area Metal-Organic Vapor Phase Epitaxy (SA-MOVPE), which offer a wide choice of pattern designs combined with a convenient processability.
The results of the transport measurements, even in zero magnetic field, show jump-like changes of the resistance. These changes are caused by magnetoelectric effects in the nanoclusters. The relative angle between the magnetization directions of neighbored domains determines the resistance of their boundary. Furthermore, domain wall dynamic effects occur depending on the sample temperature, which results in changes of the resistance. The impact of external influences, such as an external magnetic field or the sample temperature on the transport characteristics will be discussed. In addition, possible ways towards a theoretical description of the experimental findings will be discussed.