Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Magnetic Materials

MA 11.4: Vortrag

Montag, 23. März 2009, 16:00–16:15, HSZ 103

Anisotropic magnetoresistance (AMR) of magnetic graphite — •Jose Barzola-Quiquia, Pablo Esquinazi, Daniel Spemann, and Tilman Butz — Institut für Experimentelle Physik II, Universität Leipzig, D-04103 Leipzig

Complementing the experimental evidence for the existence of magnetic order induced by proton irradiation in graphite obtained by XMCD, SQUID, and LEµSR, we studied in this work the magnetotransport of irradiated oriented graphite samples. The resistance measured for fields applied parallel to the planes and at different angles respect to the current shows the typical behaviour of the AMR observed in ferromagnets including irreversibility loops. The results confirm the existence of magnetic order in irradiated graphite and rule out magnetic impurities as origin, in agreement with XMCD and LEµSR results.