Examinando por Autor "Palomares, F. J."

Mostrando 1 - 2 de 2

Restringido
Antiphase resonance at X-ray irradiated microregions in amorphous Fe80B20 stripes
(Elsevier BV, 2021-02-15) Urdiroz, U.; Gómez, Alicia; Magaz, M.; Granados, D.; Sánchez Agudo, M.; Rubio Zuazo, J.; Castro, G. R.; Stan, C.; Tamura, N.; Padmore, H. A.; Müller, C.; McCord, J.; Cebollada, F.; Palomares, F. J.; González, J. M.; Agencia Estatal de Investigación (AEI); 0000-0001-7944-340X; 0000-0002-4768-2219; 0000-0003-0237-6450; 0000-0002-1727-1654
We report on the induction, through X-ray irradiation, of local anisotropy modifications in amorphous Fe80B20 stripes prepared by laser lithography from 15 nm thick films deposited by pulsed laser ablation. Those anisotropy modifications, taking place in a zone having a dimension of 15 μm around the X-ray beam (2 µm width) incidence area center point, lead to an effective transverse-to-the-stripe long axis local magnetic easy axis that can be exploited to stably localize a 180° domain wall, in remanence after saturation with a transverse-to the stripe easy axis dc field. Upon stabilizing that wall it is possible to excite spatially inhomogeneous ferromagnetic resonances nearby the irradiated region (IR). The time dependencies of the magnetization precession at both sides of the IR exhibit a uniform phase shift of 180° over distances of the order of 20 μm from the stabilized domain wall.
Acceso Abierto
Novel design of superhydrophobic and anticorrosive PTFE and PAA + β − CD composite coating deposited by electrospinning, spin coating and electrospraying techniques
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-10-16) Vicente, Adrián; Rivero, Pedro J.; Urdiroz, U.; García Gallego, Paloma; Mora Nogués, Julio; Palacio, J. F.; Palomares, F. J.; Rodríguez, Rafael; Asociación de la Industria Navarra (AIN); Agencia Estatal de Investigación (AEI)
A superhydrophobic composite coating consisting of polytetrafluoroethylene (PTFE) and poly(acrylic acid)+ β-cyclodextrin (PAA + β-CD) was prepared on an aluminum alloy AA 6061T6 substrate by a three-step process of electrospinnig, spin coating, and electrospraying. The electrospinning technique is used for the fabrication of a polymeric binder layer synthesized from PAA + β-CD. The superhydrophilic characteristic of the electrospun PAA + β-CD layer makes it suitable for the absorption of an aqueous suspension with PTFE particles in a spin-coating process, obtaining a hydrophobic behavior. Then, the electrospraying of a modified PTFE dispersion forms a layer of distributed PTFE particles, in which a strong bonding of the particles with each other and with the PTFE particles fixed in the PAA + β-CD fiber matrix results in a remarkable improvement of the particles adhesion to the substrate by different heat treatments. The experimental results corroborate the important role of obtaining hierarchical micro/nano multilevel structures for the optimization of superhydrophobic surfaces, leading to water contact angles above 170°, very low contact angle of hysteresis (CAH = 2°) and roll-off angle (αroll−off < 5°). In addition, a superior corrosion resistance is obtained, generating a barrier to retain the electrolyte infiltration. This study may provide useful insights for a wide range of applications