Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Spin-Dynamics/Switching I
MA 19.8: Vortrag
Mittwoch, 28. März 2007, 17:00–17:15, H23
Spin transfer torque studies using focused-ion-beam assisted nanostencil mask fabrication — •Nicolas Müsgens1, Mohamed Tarik1, Coen Smits1, Georg Richter1, Bernd Beschoten1, Gernot Güntherodt1, Alexander Schwedt2, and Joachim Mayer2 — 1II. Physikalisches Institut, RWTH Aachen, 52056 Aachen, and Virtual Institute of Spinelectronics (VISel), Jülich/Aachen — 2Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen, 52065 Aachen
The transfer of a spin torque of a spin-polarized current onto a macroscopic magnetization has been investigated in confined magnetic nanostructures. Focused-ion-beam (FIB) is used to fabricate nanostencil masks with lateral device dimensions below 100 nm. Afterwards the nanopillar stack (Co/Cu/Co) is deposited in theses templates. The current-induced switching is demonstated with a giant magneto-resistance effect up to 1.6 % at room temperature.
The systematic current-induced behavior of the junctions has been investigated by studying differential resistance versus bias-current characteristics at various external magnetic fields. In addition to a hysteretic switching behavior and the appearance of resistance peaks at high magnetic fields and current densities of j ∼ 108 A/cm2, we found pronounced dips, which shift to lower currents with increasing external magnetic fields.
Work supported by DFG through SPP 1133