| Records |
Author  |
Kasama, T.; Moreno, M.S.; Dunin-Borkowski, R.E.; Newcomb, S.B.; Haberkorn, N.; Guimpel, J.; Midgley, P.A. |
| Title |
Characterization of the magnetic properties of a GdBa2Cu3O7/La0.75Sr0.25MnO3 superlattice using off-axis electron holography |
Type |
Journal Article |
| Year |
2006 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
252 |
Issue |
11 |
Pages |
3977-3983 |
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| Abstract |
Off-axis electron holography is used to characterize the magnetic properties of a GdBa2Cu3O7/La0.75Sr0.25MnO3 superlattice below the Curie temperature of the manganite layers, in both cross-sectional and plan-view geometry. The samples were prepared for electron microscopy using focused ion beam milling. Differences between the magnetic properties of successive manganite layers are observed in the cross-sectional sample. Magnetic ripple contrast and weakly magnetic regions are observed in plan-view geometry. Although the results may be affected by sample preparation for electron microscopy, the observed differences between the magnetic properties of the manganite layers are consistent between the different samples examined. (c) 2005 Elsevier B.V. All rights reserved. |
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0169-4332 |
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ISI:000236835200013 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
155 |
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| Author |
Kaul, E.E.; Haberkorn, N.; Guimpel, J. |
| Title |
Crystalline orientation of BiMnO3 thin films grown by rf-sputtering |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
254 |
Issue |
1 |
Pages |
160-163 |
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| Abstract |
BiMnO3 thin films were deposited by means of rf-sputtering onto [1 0 0] oriented SrTiO3 substrates. X-ray diffraction measurements revealed epitaxial growth with [0 0 1](m) orientation in the monoclinic structure representation, equivalent to the [1 1 1](pc) direction of the pseudocubic cationic lattice. This [0 0 1](m) orientation was obtained in a wide deposition parameters range. Preliminary magnetization measurements suggest that these films do not present ferromagnetism below the bulk Curie temperature, T-c = 105 K. (C) 2007 Elsevier B.V. All rights reserved. |
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0169-4332 |
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| Notes |
ISI:000250800100037 |
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no |
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BT @ hernan @ |
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147 |
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| Author |
Lederman, D.; Osquiguil, E.; Nieva, G.; Guimpel, J.; Hasen, J.; Bruynseraede, Y.; Schuller, I.K. |
| Title |
Photoinduced enhancement of superconductivity |
Type |
Journal Article |
| Year |
1994 |
Publication |
Journal of Superconductivity |
Abbreviated Journal |
J Supercond |
| Volume |
7 |
Issue |
1 |
Pages |
127-130 |
| Keywords |
photoconduction; Superconductivity; thin films; Copper oxides; Hall effect; Order disorder transitions; Radiation effects; Superconductivity; X ray analysis; Josephson coupling; Oxide superconductors; Yttrium barium cuprates; High temperature superconductors |
| Abstract |
The photoinduced enhancement of superconductivity in RBa2Cu3Ox (R=rare earth or yttrium) and PryR1-yBa2Cu3Ox was explored through temperature-dependent resistivity, Hall coefficient and mobility, and x-ray diffraction measurements. The increases in Tc are enhanced near the metal-insulator transition, although photoinduced changes always exist in oxygendeficient samples. Several explanations, including intergrain Josephson coupling, photoassisted oxygen ordering, and the trapping of photogenerated electrons in oxygen vacancies, are discussed. |
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Centro At |
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Kluwer Academic Publishers-Plenum Publishers |
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08961107 (ISSN) |
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Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; CODEN: JOUSE; doi: 10.1007/BF00730382; Language of Original Document: English; Correspondence Address: Lederman, D.; Physics Department; University of California; San Diego La Jolla, 92093-0319, California, United States |
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BT @ osquigui @ |
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397 |
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Lipovetzky, J.; Alcalde Bessia, F.; Guimpel, J.; Perez, M.; Gomez Berisso, M. |
| Title |
Characterization of a low-power CMOS operational amplifier from 12.5K to 273K for low temperature experiments |
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Conference Article |
| Year |
2020 |
Publication |
2020 Argentine Conference on Electronics (CAE) |
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Issue |
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Pages |
73-76 |
| Keywords |
Low temperature; CMOS; Operational Amplifier |
| Abstract |
In this work, we present the design and first characterization of an operational amplifier for use at cryogenic temperatures. We show the functionality of the amplifier in a range of temperatures from 12.5K to 273K. Drain current to gate voltage curves of n-channel and p-channel MOS transistors, resistors and the amplifier response were measured. The circuit allows the amplification of signals up to 100kHz with a power consumption of 48μW. |
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IEEE |
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2020 Argentine Conference on Electronics (CAE) |
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no |
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BT @ pedrazp @ |
Serial |
864 |
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| Author |
Lovey, F.C.; Condo, A.M.; Guimpel, J.; Yacaman, M.J. |
| Title |
Shape memory effect in thin films of a Cu-Al-Ni alloy |
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Journal Article |
| Year |
2008 |
Publication |
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING |
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481 |
Issue |
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Pages |
426-430 |
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| Abstract |
Thin films of Cu-26.9 at.% Al-5.5 at.% Ni were grown by dc magnetron sputtering from the alloy target previously melted in an induction furnace. The films were grown either on glass or (100)Si substrates at room temperature. The films, of approximately 3 μm thickness, were peeled off from the substrate for further studies. The structures and microstructures of the as grown films were analysed by transmission electron microscopy. A nanometric mixture of BCC and 2H phases was found irrespective of the substrate. The shape memory effect was not observed for this structural state. After an annealing at 1023 K for 3600s in He or Ar flux, followed by quenching to room temperature, the films were found to be in a martensitic state. Mainly the 18R structure was observed. At this stage the films were mechanically deformed at room temperature and then heated up to 373 K. A good shape recovery was observed to take place in a temperature range between 334 and 360 K. (C) 2007 Elsevier B.V. All rights reserved. |
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0921-5093 |
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ISI:000255716100088 |
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no |
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BT @ hernan @ |
Serial |
144 |
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| Author |
Luccas, R.F.; Haberkorn, N.; Guimpel, J.; Bridoux, G.; Nieva, G. |
| Title |
Growth of GdBa2Cu3O7 thin films on single crystalline substrates of Y1-xPrBa2Cu3O7 |
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Journal Article |
| Year |
2007 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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| Volume |
460 |
Issue |
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Pages |
1377-1378 |
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Superconducting GdBa2CU3O7 thin films were grown by dc magnetron sputtering on Y1-xPrxBa2CU3O7 superconducting bulk single crystals. We optimized the in plane lattice matching with the Pr concentration. The samples were characterized by X-ray diffraction and electrical transport experiments. Magnetization hysteresis loops show high values of the critical currents for the films. (c) 2007 Elsevier B.V. All rights reserved. |
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0921-4534 |
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ISI:000249870600314 |
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no |
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BT @ hernan @ |
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150 |
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| Author |
Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic state modification induced by superconducting response in ferromagnet/superconductor Nb/Co superlattices |
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Journal Article |
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2008 |
Publication |
PHYSICAL REVIEW B |
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| Volume |
77 |
Issue |
10 |
Pages |
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Magnetization measurements in superconductor/ferromagnet Nb/Co superlattices show a complex behavior as a function of temperature, applied field, and sample history. Based on a simple model, it is shown that this behavior is due to an interplay between the superconductor magnetization temperature dependence, the ferromagnet magnetization time dependence, and the stray fields of both materials. It is also shown that the magnetic state of the Co layers is modified by the Nb superconducting response, implying that the problem of a superconductor/ferromagnetic heterogeneous sample has to be solved in a self-consistent manner. |
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1098-0121 |
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| Notes |
ISI:000254542700117 |
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no |
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BT @ hernan @ |
Serial |
146 |
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| Author |
Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic behavior of superconductor/ferromagnet superlattices |
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Journal Article |
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2007 |
Publication |
PHYSICAL REVIEW B |
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75 |
Issue |
6 |
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A study of the electromagnetic response of superconductor/ferromagnet Nb/Co superlattices is presented. The dc magnetization is measured as a function of Co layer thickness, applied field H-a, and temperature. For very thin Co layers, no ferromagnetism is detected and the observed response is essentially that of a collection of uncoupled Nb layers. When the Co layer is thick enough for ferromagnetism to be established, prior to the field-cooled magnetization measurements, the Co layers are magnetically saturated in the parallel or antiparallel directions to H-a. In this case, the magnetic response of the otherwise uncoupled Nb layers is found to depend on both H-a and the stray fields. |
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1098-0121 |
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| Notes |
ISI:000244533000075 |
Approved |
no |
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BT @ hernan @ |
Serial |
151 |
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| Author |
Monton, C.; Guimpel, J.; de la Cruz, F. |
| Title |
Superconducting behaviour of Nb/Co superlattices |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
254 |
Issue |
1 |
Pages |
375-377 |
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We study the superconducting and magnetic behaviour of Nb/Co superlattices, for superconducting Nb layer thickness of 44 nm and Co layer thickness less than 1 nm. In this limit no ferromagnetism is observed for Co. The superlattice behaves as independent superconducting Nb layers. We obtain the penetration depth and superconducting gap of the material, and analyze the results in terms of microscopic models and theories. (C) 2007 Elsevier B.V. All rights reserved. |
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0169-4332 |
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ISI:000250800100085 |
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no |
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BT @ hernan @ |
Serial |
149 |
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| Author |
Monton, C.; Ramos, C.A.; Guimpel, J.; Zysler, R.D. |
| Title |
Experimental evidence of magnetic anisotropy induction by superconductivity in superlattices |
Type |
Journal Article |
| Year |
2008 |
Publication |
Applied Physics Letters |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
92 |
Issue |
15 |
Pages |
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We present a study of Nb/Co superlattices by ferromagnetic resonance. We find that when the superconductor enters the Meissner state, an anisotropy field around 400 Oe, parallel to the applied field, appears in the ferromagnetic layers, consistent with the superconducting flux expelled from the superconducting layers. This anisotropy field is an important key to understand previous results showing that the superconductor layers modify the magnetic state of the ferromagnetic layers. (c) 2008 American Institute of Physics. |
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0003-6951 |
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ISI:000255117100061 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
145 |
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