Institute Nanociencia

Castejón de las Armas, Spain

Institute Nanociencia

Castejón de las Armas, Spain

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Pelado B.,Institute Nanociencia | Coro J.,Institute Nanociencia | Coro J.,University of Habana | De La Cruz P.,Institute Nanociencia | Langa F.,Institute Nanociencia
Journal of Porphyrins and Phthalocyanines | Year: 2015

The synthesis and structural characterization and the study of the electronic properties of two novel porphyrin-bridge-fullerene molecules, where a free-based porphyrin and [60]fullerene are connected through one and two units of ethylenedioxythienylenevinylene π-conjugated bridges, is reported. The absorption studies, voltamperometric measurements and theoretical calculations at DFT level are presented. A HOMO-LUMO gap as low as 1.41 eV has been found for compound 6. © 2015 World Scientific Publishing Company.


Arranz M.A.,University of Castilla - La Mancha | Colino J.M.,Institute Nanociencia
Journal of Physics D: Applied Physics | Year: 2016

The magneto-optical properties of eroded polycrystalline Co films were investigated using Kerr and Voigt magnetometry. Both techniques showed the existence of two magnetization axes, parallel and perpendicular to the ripples direction. The study on the polarization rotation of the transmitted light revealed a fine magnetic birefringence correlated to that two-axes magnetic structure. Additionally, the field depencence of that induced rotation depicted asymmetric hysteresis loops, comprising linear (Faraday) and quadratic (Voigt) dependences on the in-plane magnetic field applied to these rippled Co films. This latter contribution, depending on the spin-orbit coupling in crystalline systems, is here uncovered from the different mechanisms for reversing the magnetization along the symmetry axes of the ripples array. That dissimilarity enabled us to characterize its magnetooptical tensor with a two-fold symmetry, yielding the occurrence of magnetic birefringence in the transmitted light. This Voigt effect in uniaxially patterned Co films can be satisfactorily explained in the frame of magnetization reversal along that two-axes magnetic structure. © 2016 IOP Publishing Ltd.


Arranz M.A.,University of Castilla - La Mancha | Colino J.M.,Institute Nanociencia
Journal of Physics: Conference Series | Year: 2010

We have investigated the formation of nanoscale ripples on etched Co/Si(100) films with Ar+ beam in grazing incidence. Topography and dimensions of those nanoscale patterns were characterized by means of atomic force microscopy. Polycrystalline cobalt thin films were deposited by d.c. magnetron sputtering onto Si(100) wafers and, later transferred in situ to a process chamber for the production of ripples. Their average width, W d, and separation between them, i.e. their periodicity Λ, were found to monotonously increase first with the etching time and, finally, reach saturation values for long irradation times (around 30 min). The same Ar + beam etching applied on thicker Co films resulted in much wider and higher ripples, providing a more defined nanostructure for ulterior uniaxial magnetic anisotropy measurements. These changes in the ripple dimensions on increasing the Co film thickness are discussed in terms of the surface roughness in the as-deposited film. © 2010 IOP Publishing Ltd.

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