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Author Salazar Alarcón, L. and Martínez,E. D. and Rodríguez, L. M. and Pastoriza, H. doi  openurl
  Title Topographical and Physicochemical Contrast in Photopatterned SU-8 Films for Microfabrication of Multilayer Structures Type Journal Article
  Year 2016 Publication Advances in Materials Science and Engineering Abbreviated Journal  
  Volume 2016 Issue Pages (down) 5278102  
  Keywords  
  Abstract 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.  
  Address  
  Corporate Author Thesis  
  Publisher Hindawi Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1687-8434 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 731  
Permanent link to this record
 

 
Author Sereni, J.G; Giovannini, M.; Gomez Berisso, M.; Gastaldo, F. url  doi
openurl 
  Title Competition between ferromagnetism and frustrated antiferromagnetism in quasi 2D Ce 2.15 (Pd 1− x Ag x ) 1.95 In 0.9 alloys Type Journal Article
  Year 2016 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys. : Condens. Matter  
  Volume 28 Issue 47 Pages (down) 475601  
  Keywords  
  Abstract 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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  Corporate Author Thesis  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0953-8984 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 740  
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Author Correa, V.F.; Betancourth, D.; Sereni, J.G.; Caroca-Canales, N.; Geibel, C. url  doi
openurl 
  Title Remarkable magnetostructural coupling around the magnetic transition in CeCo0.85Fe0.15Si Type Journal Article
  Year 2016 Publication Journal of Physics: Condensed Matter Abbreviated Journal J. Phys.: Condens. Matter  
  Volume 28 Issue 34 Pages (down) 346003  
  Keywords magnetostriction, cerium compounds, magnetism  
  Abstract 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 ( (16T)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.
 
  Address  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ victor.correa @ Serial 732  
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Author Haberkorn, N.; Coulter, Y.; Condó, A.M.; Granell, P.; Golmar, F.; Ha, H.S.; Moon, S.H. openurl 
  Title Vortex creep and critical current densities Jc in a 2μm thick SmBa2Cu3O7−d coated conductor with mixed pinning centers grown by co-evaporation Type Journal Article
  Year 2016 Publication Superconductor Science and Technology Abbreviated Journal  
  Volume 29 Issue Pages (down) 075011  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 748  
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Author Dellavale, D.; Roselló, J. M. openurl 
  Title Cross-frequency coupling and phase synchronization in nonlinear acoustics Type Journal Article
  Year 2016 Publication Proceedings of Meetings on Acoustics Abbreviated Journal  
  Volume 28 Issue Pages (down) 055001  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 755  
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Author Cejas Bolecek, N.R.; Kolton, A.B.; Konczykowski, M.; Pastoriza, H.; Dominguez, D.; Fasano, Y. url  doi
openurl 
  Title Vortex matter freezing in Bi2Sr2CaCu28 samples with a very dense distribution of columnar defects Type Journal Article
  Year 2016 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 93 Issue 5 Pages (down) 054505  
  Keywords  
  Abstract 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.  
  Address  
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  Publisher American Physical Society Place of Publication Editor  
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  Notes Approved no  
  Call Number BT @ pedrazp @ 10.1103/PhysRevB.93.054505 Serial 738  
Permanent link to this record
 

 
Author Martinez, E.D.; Lohr, J.H.; Sirena, M.; Sanchez, R.D.; Pastoriza, H. url  doi
openurl 
  Title Silver nanowires in poly(methyl methacrylate) as a conductive nanocomposite for microfabrication Type Journal Article
  Year 2016 Publication Flexible and Printed Electronics Abbreviated Journal  
  Volume 1 Issue 3 Pages (down) 035003  
  Keywords  
  Abstract 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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  Series Volume Series Issue Edition  
  ISSN 2058-8585 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 733  
Permanent link to this record
 

 
Author Sereni, J.G. doi  openurl
  Title Magnetic Systems: Specific Heat Type Journal Article
  Year 2016 Publication Reference Module in Materials Science and Materials Engineering Abbreviated Journal  
  Volume 2016 Issue Pages (down) 4986  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 759  
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Author 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. openurl 
  Title Analysis of SRAM-Based FPGA SEU Sensitivity to Combined EMI and TID-Imprinted Effects Type Journal Article
  Year 2016 Publication IEEE Transactions on Nuclear Science Abbreviated Journal  
  Volume 63 Issue Pages (down) 1294  
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  Notes Approved no  
  Call Number BT @ pedrazp @ Serial 753  
Permanent link to this record
 

 
Author del Corro, P. G.; Imboden, M.; Bishop, D. J.; Pastoriza, H. url  doi
openurl 
  Title Comb Drive Designs With Minimized Levitation Type Journal Article
  Year 2016 Publication Journal of Microelectromechanical Systems Abbreviated Journal Journal of Microelectromechanical Systems  
  Volume 25 Issue 6 Pages (down) 1025-1032  
  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  
  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.
 
  Address  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1057-7157 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number BT @ hernan @ Serial 744  
Permanent link to this record
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