Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Spin Dynamics / Spin Torque I

MA 19.4: Vortrag

Mittwoch, 27. Februar 2008, 14:45–15:00, EB 301

Spin-current induced magnetic excitations in single magnetic layer nanopillars — •Marc Weidenbach¹, Eva Maynicke¹, Nicolas Müsgens¹, Coen Smits¹, Bernd Beschoten¹, Matthias Bückins², Joachim Mayer², and Gernot Güntherodt¹ — ¹II Physikalisches Institut A, RWTH Aachen, 52056 Aachen, and Virtual Institute for Spinelectronics (VISel) — ²Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen, 52065 Aachen

We investigate current-induced spin-wave excitations in Cu/Co/Cu single magnetic layer nanopillar devices with asymmetric Cu leads by means of transport and microwave probes at room temperature.

The thin film stack is deposited by MBE in prefabricated nanostencil masks with lateral dimensions below 100 nm. At high current densities we observe narrow excitations (bandwidth ∼ 100 MHz) and higher harmonics for magnetic fields perpendicular to the layers. The frequency increases with increasing current and magnetic field, which indicates an out-of plane precessional mode as found in bilayer systems (e.g., Kiselev et al., PRL 93, 036601(2004)).

Furthermore we observe frequency jumps as a function of both current and magnetic field, which might originate from transitions between different localized nonlinear spin-wave modes.

Work supported by DFG through SPP1133.