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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.22: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Magnetoresistance of ferromagnetic materials on self-assembled nanospheres — •Florian Strigl and Elke Scheer — Department of Physics, University of Konstanz, 78475 Konstanz, Germany

Self-assembled spherical particles provide a huge variety of applications. Here we present a study in which they are brought into a linear arrangement by deposition onto a lithographically defined mask. We evaporate ferromagnetic materials of different thickness and composition, e.g. Co/Pd multilayers, onto these chains and contact them electrically with normal or superconducting leads. Co/Pd multilayers show a high magnetic anisotropy perpendicular to their surface [Albrecht]. Due to the limited dimension and the curvature, the multilayer-caps are single-domain and magnetically decoupled, but in electrical contact with each other. It is possible to control the magnetisation of a single cap by a magnetic force microscope (MFM) or of the whole chain by applying an external field while measuring the electrical conductance. Magnetoresistance measurements on 2D arrangements [Kimling] have shown large amplitudes, where the underlying mechanism is proposed to be similar to GMR.

Currently we are investigating the magnetoresistance of pure Co layers with varying thicknesses, the influence of the contacting materials (Au, Al) and characterising the system via MFM measurements.

[Albrecht] Nature Mater. 4 (2005) 203

[Kimling] JAP 107 (2010) 09C506