Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 30: Focus Session "Spin Currents in Magnetic Nanostructures", Organization: Mathias Kläui (Univ. Mainz)

MA 30.7: Vortrag

Mittwoch, 28. März 2012, 17:45–18:00, EB 301

Optimization of spin injection and detection in lateral nanostructures by geometrical means — •Ondřej Stejskal, Jaroslav Hamrle, and Jaromír Pištora — Department of Physics and Nanotechnology Centre, VSB - Technical University of Ostrava, Czech Republic

Lateral nanostructures are important branch of spintronic devices as they extend possibilities of simpler perpendicular devices. For efficient operation of lateral devices, it is important to maximize spin injection and spin detection efficiency. Several approaches were proposed, such as design of new injector/detector materials (e.g. half metals), or using spin-barried between spin injector/detector and spin conductor (such as MgO barrier).

Here, we suggest alternative optimization of spin injection and detection, by engineering the dimensions of the lateral device. For example, we show that spin injector efficiency can be increased by reduction of cross-sectional area of junction between injector and spin conductor or by increasing the cross-section of the spin-conductor. Furthermore, in lateral spin-valve structures, the detection is provided by second FM element (detector). Depending on purpose of the device, different quantities may need to be optimized, such as spin voltage on detector (in case the purpose is reading of the magnetic state of the detector) or spin current flowing into the detector (in case the spin-manipulation of the detector is important). We discuss how those quantities may be optimized by variation of the cross-sectional area, resistivity and polarization of the junction between detector and spin conductor.