Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.85: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Spin transport in a thin crystalline graphite flake — •Jose Barzola-Quiquia and Pablo Esquinazi — Abteilung Supraleitung und Magnetism, Universität Leipzig, 04103 Leipzig

Due to the large electron mobility and mean free path, thin crystalline graphite samples are expected to have some advantages for certain devices in comparison with single graphene layers fixed on dielectric substrates. In this work we have tested the spin transport on a 30 nm thick and several micrometer long single crystalline graphite flake using a spin-valve configuration with four ferromagnetic Co electrodes of different widths and several µm separation. A 5 nm thin Pt layer has been introduced in between the ferromagnetic Co injector/detector and the graphite surface. In spite of the conductivity mismatch problem, efficient electrical spin injection and detection in graphite has been achieved. The magnetoresistance in the local and half-local electrodes shows clear maxima with symmetry around zero field. The spin transport can be detected up to 150 K, the maximum temperature used.