Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.48: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Spin precession and modulation in ballistic cylindrical nanowires due to Rashba effect — Andreas Bringer¹ and •Thomas Schaepers² — ¹Institute of Solid State Research and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — ²Institute of Bio- and Nanosystems (IBN-1) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

The spin precession in a cylindrical semiconductor nanowire due toRashba spin-orbit coupling is theoretically investigated. We employed an InAs nanowire containing a surface two-dimensional electron gas as a model system. By solving the Schrödinger equation in a cylindrical symmetry the corresponding eigenstates, the energy-momentum dispersion, and the energy-magnetic field dispersion relation are determined. The combination of states with the same total angular momentum but opposite spin orientation results in a periodic modulation of the axial spin component along the wire axis. Spin-precession about the wires axis is achieved by interference of two states with different total angular momentum. Due to the fact that at zero magnetic field a superposition state with exact opposite spin precession exists an oscillation of the spin orientation can be obtained. In case that an axially oriented magnetic field is applied the spin gains a precessing component in addition.

Various injection and detection methods are studied to demonstrate the functionality of these modes in spin electronic devices.