Time- and frequency-domain investigations of spin-transfer-driven nanomagnet dynamics

• Applicant: Dr. Bernd Beschoten
• Subject Area: Experimental Condensed Matter Physics
• Term: from 2006 to 2009
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 27890237

We propose to study coherent precessional switching and damping phenomena in magnetic nanostructures as induced by spin-polarized electrical currents in both the frequency- and time-domain. Samples will be prepared by a novel patterning process based on an undercut mask technique. This approach enables to create large arrays of templates, which allow to quickly modify and optimize both material combinations and growth conditions. Furthermore, this method is suitable for utilizing and probing intrinsic properties of magnetic nanostructures for both in-plane and out-of-plane current configurations. We suggest to address the role of coherent uniform vs. incoherent non-uniform spin wave excitations for current-induced switching. Our investigations will focus on dynamic studies in asymmetric single layer junctions and bilayer junctions with both in- and out-of-plane anisotropies. In particular, we want to explore the crossover regime from incoherent to coherent spin wave excitations as induced and controlled by pulsed electrical spin currents.

• DFG Programme: Priority Programmes
• Subproject of: SPP 1133: Ultrafast magnetization processes
• Participating Person: Professor Dr. Gernot Güntherodt