Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.29: Poster

Tuesday, March 12, 2013, 10:30–13:30, Poster D

Granular GMR effects in systems with organic matrix — •Judith Meyer, Markus Schäfers, Thomas Rempel, and Andreas Hütten — Bielefeld University, Universitätsstr.25, 33615 Bielefeld

The giant magnetoresistance effect (GMR effect) was found in magnetic multilayer systems [1,2] and was later also reported within granular systems by several research groups who had embedded magnetic particles in a metallic matrix [3,4]. In contrast to previous granular layered systems, we have incorporated Co nanoparticles in a conductive nonmagnetic biogel. Transport measurements carried out using a 4-point-probe measurement at room temperature revealed GMR effects of more than 60 percent. AC transport measurements were found to improve the long-term stability of the effect amplitude. Regarding future applications, the possibility of printing gel will allow for the development of granular gel-GMR sensors more rapid and less expensive in fabrication compared to conventional devices. The large effect amplitudes will ensure high sensor sensitivity and the mechanical flexibility of the matrix might additionally open up new fields of application.