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Salazar Alarcón, L. and Martínez,E. D. and Rodríguez, L. M. and Pastoriza, H. |
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Title |
Topographical and Physicochemical Contrast in Photopatterned SU-8 Films for Microfabrication of Multilayer Structures |
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2016 |
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Advances in Materials Science and Engineering |
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2016 |
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5278102 |
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During SU-8 standard photolithography process, a patterned topography is formed with a characteristic height profile produced by the different shrinkage of the UV exposed and masked regions. We study the change of wettability, film solubility, and topographic modifications on SU-8 films of different thicknesses and show its relevance in the formation of spinning-flow arrays on top layers made from positive photoresists. Also, considerable contrast in film solubility and surface energy as observed from contact angle measurements is produced. Interface diffusion of the photoresists was also observed and followed by Rutherford Back Scattering. We discuss the derivations of the mentioned effects concerning the limitations to multilayered microfabrication processes and possibilities to take advantage of the surface profiles obtained. |
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Hindawi |
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1687-8434 |
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BT @ hernan @ |
Serial |
731 |
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Author |
Sereni, J.G; Giovannini, M.; Gomez Berisso, M.; Gastaldo, F. |
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Title |
Competition between ferromagnetism and frustrated antiferromagnetism in quasi 2D Ce 2.15 (Pd 1− x Ag x ) 1.95 In 0.9 alloys |
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Journal Article |
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Year |
2016 |
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Journal of Physics: Condensed Matter |
Abbreviated Journal |
J. Phys. : Condens. Matter |
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28 |
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47 |
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475601 |
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Low temperature thermal and magnetic measurements performed on ferro-magneticl (FM) alloys of composition Ce2.15(Pd1−x Ag x )1.95In0.9 are presented. Pd substitution by Ag depresses ${{T}{\text{C}}}(x)$ from 4.1 K down to 1.1 K for x  =  0.5, which is related to the increase of band electrons, with a critical concentration extrapolated to ${{x}{\text{cr}}}\approx 0.6$ . The ${{T}{\text{C}}}(x)$ decrease is accompanied by a weakening of the magnetization of the FM phase. At high temperature (T  >  30 K) the inverse magnetic susceptibility reveals the presence of robust magnetic moments ($2.56\geqslant ~{{\mu}{\text{eff}}}\geqslant 2.4$ ${{\mu}{\text{B}}}$ ), whereas the low value of the Curie–Weiss temperature ${{\theta}{P}}\approx -10$ K excludes any relevant effect from Kondo screening. The specific heat jump at ${{T}{\text{C}}}(x)$ decreases accordingly, while an anomaly emerges at a fixed temperature ${{T}^{\ast}}\approx 1$ K. This unexpected anomaly does not show any associated sign of magnetism checked by AC-susceptibility measurements. Since the total magnetic entropy (evaluated around $T={{T}{\text{C}}}(x=0)$ ) practically does not change with Ag concentration, the transference of degrees of freedom from the FM component to the non-magnetic T * anomaly is deduced. The origin of this anomaly is attributed to an arising magnetic frustration of the ground state and the consequent entropy bottleneck produced by the divergent increasing of density of excitations at low temperature. |
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0953-8984 |
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BT @ pedrazp @ |
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740 |
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Correa, V.F.; Betancourth, D.; Sereni, J.G.; Caroca-Canales, N.; Geibel, C. |
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Title |
Remarkable magnetostructural coupling around the magnetic transition in CeCo0.85Fe0.15Si |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Physics: Condensed Matter |
Abbreviated Journal |
J. Phys.: Condens. Matter |
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28 |
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34 |
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346003 |
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magnetostriction, cerium compounds, magnetism |
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We report a detailed study of the magnetic properties of CeCo0.85Fe0.15Si under high magnetic
fields (up to 16 Tesla) measuring different physical properties such as specific heat, magnetization,
electrical resistivity, thermal expansion and magnetostriction. CeCo0.85Fe0.15Si becomes
antiferromagnetic at TN 6.7 K. However, a broad tail (onset at TX 13 K) in the specific heat
precedes that second order transition. This tail is also observed in the temperature derivative of
the resistivity. However, it is particularly noticeable in the thermal expansion coefficient where it
takes the form of a large bump centered at TX. A high magnetic field practically washes out that tail
in the resistivity. But surprisingly, the bump in the thermal expansion coefficient becomes a well
pronounced peak fully split from the magnetic transition at TN. Concurrently, the magnetoresistance
also switches from negative to positive above TN. The magnetostriction is considerable and
irreversible at low temperature ( (16 T) 4×10− L
L
4 at 2 K) when the magnetic interactions
dominate. A broad jump in the field dependence of the magnetostriction observed at low T may be
the signature of a weak ongoing metamagnetic transition. Taking altogether the results indicate the
importance of the lattice effects on the development of the magnetic order in these alloys. |
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BT @ victor.correa @ |
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732 |
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Haberkorn, N.; Coulter, Y.; Condó, A.M.; Granell, P.; Golmar, F.; Ha, H.S.; Moon, S.H. |
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Vortex creep and critical current densities Jc in a 2μm thick SmBa2Cu3O7−d coated conductor with mixed pinning centers grown by co-evaporation |
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2016 |
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Superconductor Science and Technology |
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29 |
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075011 |
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BT @ pedrazp @ |
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748 |
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Author |
Dellavale, D.; Roselló, J. M. |
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Title |
Cross-frequency coupling and phase synchronization in nonlinear acoustics |
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Journal Article |
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2016 |
Publication |
Proceedings of Meetings on Acoustics |
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28 |
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055001 |
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BT @ pedrazp @ |
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755 |
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Cejas Bolecek, N.R.; Kolton, A.B.; Konczykowski, M.; Pastoriza, H.; Dominguez, D.; Fasano, Y. |
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Vortex matter freezing in Bi2Sr2CaCu28 samples with a very dense distribution of columnar defects |
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Journal Article |
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2016 |
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Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
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93 |
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5 |
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054505 |
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We show that the dynamical freezing of vortex structures nucleated at diluted densities in Bi2Sr2CaCu2O8 samples with a dense distribution of columnar defects, B∼10−2BΦ with BΦ=5kG, results in configurations with liquidlike correlations. We propose a freezing model considering a relaxation dynamics dominated by double-kink excitations driven by the local stresses obtained directly from experimental images. With this model we estimate the relaxation barrier and the freezing temperature. We argue that the low-field frozen vortex structures nucleated in a dense distribution of columnar defects thus correspond to an out-of-equilibrium nonentangled liquid with strongly reduced mobility rather than to a snapshot of a metastable state with divergent activation barriers as, for instance, expected for the Bose-glass phase at equilibrium. |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.93.054505 |
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738 |
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Martinez, E.D.; Lohr, J.H.; Sirena, M.; Sanchez, R.D.; Pastoriza, H. |
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Silver nanowires in poly(methyl methacrylate) as a conductive nanocomposite for microfabrication |
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Journal Article |
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2016 |
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Flexible and Printed Electronics |
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1 |
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3 |
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035003 |
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A novel nanocomposite resist is presented based on AgNWs dispersed in poly(methyl methacrylate). It is shown that this nanocomposite resist displays sheet resistances below 10 Ω sq −1 for concentrations of AgNWs higher than ##IMG## [http://ej.iop.org/images/2058-8585/1/3/035003/fpeaa3d4dieqn1.gif] {$4 \% {\rm{wt}}$} and can be used for a wide range of microfabrication techniques. The resist can act as a conductive ink that cures at room temperature, form thin films with low sheet resistances, and be used in fast replication methods derived from soft lithography. Furthermore, it can be applied for nano-scale fabrication via electron beam lithography (EBL) on different substrates, including flexible and insulating materials, providing a straightforward method to avoid charging effects. This, being the first report about a nanocomposite resist based on AgNWs for EBL, describes a simple procedure to account for suspended nanowires, forming bridges, nanocantilevers and more complex nanostructures. A wide range of opportunities opens for the single-step fabrication of electronic components in the nano and micro scale. |
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2058-8585 |
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BT @ hernan @ |
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733 |
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Author |
Sereni, J.G. |
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Title |
Magnetic Systems: Specific Heat |
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2016 |
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Reference Module in Materials Science and Materials Engineering |
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2016 |
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4986 |
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BT @ pedrazp @ |
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759 |
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Benfica, J.; Green, B.; Porcher, B.C.; Bolzani Poehls, L.; Vargas, F.; Medina, N.H.; Added, N.; de Aguiar, V.A.P.; Macchione, E.L.A.; Aguirre, F.; Silveira, M.A.G.; Pérez, M.; Sofo Haro, M.; Sidelnik, I.; Blostein, J.J.; Lipovetzky, J.; Bezerra, E.A. |
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Title |
Analysis of SRAM-Based FPGA SEU Sensitivity to Combined EMI and TID-Imprinted Effects |
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Journal Article |
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2016 |
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IEEE Transactions on Nuclear Science |
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63 |
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1294 |
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BT @ pedrazp @ |
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753 |
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del Corro, P. G.; Imboden, M.; Bishop, D. J.; Pastoriza, H. |
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Title |
Comb Drive Designs With Minimized Levitation |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Microelectromechanical Systems |
Abbreviated Journal |
Journal of Microelectromechanical Systems |
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25 |
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6 |
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1025-1032 |
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Keywords |
driver circuits; electrostatic actuators; microfabrication; Mems; capacitive comb drive design; comb finger polarity; comb geometry optimization; control electrode; distance 3.6 mum; electric field; electrostatic actuation; levitation effect elimination; polyMUMP technology; vertical force suppression; voltage 80 V; Capacitance; Force; Levitation; Micromechanical devices; Mobile communication; Springs; Substrates; Mems; actuators; comb drives; levitation |
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Abstract |
This paper presents two capacitive comb drive
designs for electrostatic actuation of MEMS with the aim to
eliminate the levitation effect often observed in such systems.
By placing a shield over the comb drive fingers, it is possible
to balance the electric field and suppress vertical forces while
maintaining the desired lateral motion. By optimizing the comb
geometry, we demonstrate that our approach is able to reduce the
levitation by an order of magnitude and unwanted coupling of
motion from out-of-plane to in-plane by a factor of 7 compared
with standard comb architectures fabricated using PolyMUMPs
technology, without the need of alternating comb finger polarities
or additional control electrodes. Levitation was reduced to
160 nm, for 3.6-µm lateral displacement at a driving voltage
of 80 V. |
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1057-7157 |
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BT @ hernan @ |
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744 |
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