IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Novel properties of carbon-based materials
Autor/es:
BAJALES, NOELIA; ARANA, MERCEDES; MONTORO, SILVIA; FERRÒN, JULIO; BOETTCHER, ARTUR; CASTELLANO, GUSTAVO; BERCOFF, PAULA
Lugar:
Puerto Iguazú, Misiones
Reunión:
Congreso; 13er Congreso Internacional en Ciencia y Tecnología de Metalurgia y Materiales. SAM-CONAMET; 2013
Resumen:
Carbon-based nanomaterials attract a good deal of attention for their electronic, mechanical, optical, magnetic and chemical properties [1,2]. In particular, the formation of magnetic carbon species is a phenomenon in the most up-to-date research findings. Identifications have been made of ferromagnetic and superconducting hysteresis loops in highly oriented pyrolytic graphite [3]. Several works on magnetic carbon have stimulated interest in new carbon-based magnetic nanomaterials constituted by light elements exclusively [4]. Nanostructured carbons exist as nanotubes, graphene and fullerenes. The discovery of ferromagnetism in rhombohedral C60 polymers [5] has opened up the possibility of a whole new family of magnetic fullerenes. These functionalized C60 species have a Curie temperature Tc of 16.1 K and unconventional ferromagnetic behavior below this temperature. Many authors suggest that defects in graphene account for the presence of magnetism in this non-magnetic material [6]. However, it has not yet been discovered what the optimum conditions for their formation are. Also, the origin of magnetism and the mechanisms of formation are not totally known. In this work, we report a multicharacterization study of high-ordered defects generated on graphene by means of ion and electron bombardment, and novel magnetic properties observed in thick films of fullerenes. These structures are characterized by Raman spectroscopy, X-ray diffraction, vibrating sample magnetometry, SQUID, magnetic force microscopy and high-resolution scanning electron microscopy.   [1] Trauzettel, B., Bulaev, D. V., Loss, D. & Burkard, G. Spin qubits in graphene quantum dots. Nature Phys. 3, 192?196 (2007).[2] P. A. Khomyakov, G. Giovannetti, P. C. Rusu, G. Brocks, J. van den Brink, and P. J. Kelly, Physical Review B 79, 195425 (2009).[3] Kopelevich Y, Esquinazi P, Torres J H S and Moehlecke S J. Low Temp. Phys., 119 691 (2000).[4] A. V. Eletskii Phys.Usp. 50 225261 (2007). [5]Makarova T L, Sundqvist B, Hohne R, Esquinazi P, Kopelevich Y, Scharff P, Davydov V A, Kashevarova L S and Rakhmanina A V Nature 413 716-8 (2001). [6] P.Esquinazi ,J.Barzola-Quiquia, D.Spemann, M.Rothermel, H.Ohldag, N.Garcıa, A.Setzer, T. Butz, Journal of Magnetism and Magnetic Materials 322 1156?1161 (2010).