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Carmona Tejero, Noemi ; Bouzas, V. ; Jiménez, F. ; Plaza, M. ; Pérez García, Lucas ; García, M. A. ; Villegas, M. A. ; LLopis, J. | Elsevier Science S A | 2010-03-04Optical absorption and magnetic properties of silica sol-gel monoliths doped with cobalt starting from different precursors and water/1-propanol molar ratios are investigated. Structural characterization of the sol-gel by X-ray absorption near-e[...]texto impreso
Marcano, N. ; Sangiao, S. ; Magén, C. ; Morellon, L. ; Ibarra,, M. R. ; Plaza, M. ; Pérez García, Lucas | American Physical Society | 2010-09-29We have investigated the magnetotransport properties of ultrathin films of Bi grown on thermally oxidized Si(001) substrates with thickness ranging from 10 to 100 nm at temperatures down to 2 K and in magnetic fields up to 90 kOe. Remarkable dif[...]texto impreso
Serrano, A., A. ; Plaza, M. ; Pérez García, Lucas ; Venta, J. de la ; LLopis, J. ; García, M. A. | American Physical Society | 2009-04We report here the observation of ferromagnetism (FM) at 300 K in mixtures of TiO? and Co?O? powders despite the antiferromagnetic and diamagnetic characters of both oxides, respectively. The ferromagnetic behavior is found in the early stages o[...]texto impreso
Marcano, N. ; Sangiao, S. ; Plaza, M. ; Pérez García, Lucas ; Fernández Pacheco, A. ; Córdoba, R. ; Sánchez, M. C. ; Morellon, L. ; Ibarra, M. R. ; De Teresa, J. M. | American Institute of Physics | 2010-02-22We study the electrical resistivity of individual Bi nanowires of diameter 100 nm fabricated by electrodeposition using a four-probe method in the temperature range 5-300 K with magnetic fields up to 90 kOe. Low-resistance Ohmic contacts to indi[...]
