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Dissertations / Theses on the topic 'Nanocontatos'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Cunha, Rafael Otoniel Ribeiro Rodrigues da. "Transferência de spin em nanopilares e nanocontatos magnéticos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/53121.

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Neste trabalho serão apresentados resultados recentes de estudos de magnetorresistência gigante (GMR), na configuração corrente perpendicular ao plano, e de transferência de spin (TS) em multicamadas magnéticas. Para tal foram desenvolvidos sistemas de análise magnetorresistiva, assim como a preparação de amostras. O ponto fundamental para este tipo de estudo está, basicamente, na construção de sistemas que apresentam alta densidade de corrente e com estabilidade. Com o objetivo de contornar estas dificuldades, o problema foi abordado em duas frentes de estudo: i) nanocontatos e nanopilares, e

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2

Corrêa, Júnior Clóvis. "Ruído no transporte eletrônico em sistemas mesoscópicos." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277880.

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Orientador: Guillermo Gerardo Cabrera Oyarzun<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-09-24T18:53:24Z (GMT). No. of bitstreams: 1 CorreaJunior_Clovis_M.pdf: 2475896 bytes, checksum: c134096367f5dc832f4c32ec8a9e224b (MD5) Previous issue date: 2009<br>Resumo: Nesta dissertação de mestrado são descritas as características fundamentais dos condutores mesoscópicos, e as origens e propriedades das várias fontes de ruído em condutores. Primeiramente, descrevemos o ruído com distintos métodos e enfatizamos a

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3

Kulyk, Illya. "High frequency relaxation kinetics in metal and high-Tc superconductor nanocontacts." [S.l. : [Groningen : s.n.] ; University of Groningen] [Host], 2008. http://irs.ub.rug.nl/ppn/.

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4

Gangloff, Dorian Armand. "Nanocontacts controlled atom-by-atom in an ion-crystal friction emulator." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104459.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2016.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 187-200).<br>Friction is the basic, ubiquitous mechanical interaction between two surfaces that results in resistance to motion and energy dissipation. To test long-standing atomistic models of friction processes at the nanoscale, we implemented a synthetic nan

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5

Dednam, Wynand. "Atomistic simulations of competing influences on electron transport across metal nanocontacts." Thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10500/26155.

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In our pursuit of ever smaller transistors, with greater computational throughput, many questions arise about how material properties change with size, and how these properties may be modelled more accurately. Metallic nanocontacts, especially those for which magnetic properties are important, are of great interest due to their potential spintronic applications. Yet, serious challenges remain from the standpoint of theoretical and computational modelling, particularly with respect to the coupling of the spin and lattice degrees of freedom in ferromagnetic nanocontacts in emerging spintro

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6

Kong, Shuo, and Xu Sun. "Setup of pulsed IV system and characterization of magnetic nanocontacts and microwires." Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16523.

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The development of resistance measurement techniques is very important for characterization of future nanoelectronics. Pulsed IV measurement techniques are very useful for accurate resistance measurements on nanoscale samples because of the efficient removal of e.g. EMF errors. In the project we have designed a pulsed IV-setup based on a state-of-the art current source (6221) and nanovoltmeter (2182A) from Keithley, and used the setup for resistance measurements on ferromagnetic samples. Two different samples were investigated using the pulsed IV system – ferromagnetic wires with a central nan

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7

Olivera, Bernat. "Electronic transport in metals at the atomic scale: capacitance emergent magnetism and f-electrons influence." Doctoral thesis, Universidad de Alicante, 2017. http://hdl.handle.net/10045/73051.

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Hemos desarrollado una técnica de medida a 4 puntas en corriente alterna con amplificadores “Lock-in” sincronizados para obtener la variación local de la capacidad entre los electrodos de un STM simultáneamente con su conductancia. La resolución a la que llegamos es de fF. En la evolución de la capacidad frente a la distancia entre electrodos distinguimos tres regiones: capacidad clásica (cuando los electrodos están más alejados), capacidad cuántica (en un régimen intermedio) y fuga de capacidad (cuando se entra en corriente túnel). En el régimen de emisión de campo, en los puntos en los que l

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8

Eggeling, Eike Moritz [Verfasser]. "Spin-torque induced high frequency excitations and switching in spin-valve nanocontacts / Eike Moritz Eggeling." Bielefeld : Universitätsbibliothek Bielefeld, Hochschulschriften, 2012. http://d-nb.info/1023863669/34.

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9

Li, Wu-Xia. "A study of nano-structured systems: Co1-xPtx nanowire and W-Ga-C composite nanocontacts." Thesis, University of Salford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490521.

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Within the context of the worldwide effort in the research and development in information technologies, an investigation has been conducted mainly on the electrodeposited Coi-xPtx embedded in anodic aluminium oxide (AAO) templates by an alternating current technique. To further an understanding of the structural, magnetic, optical and magneto-optical properties of Coi-xPtx (14 nm in diameter) nanowire arrays, the chemical composition, electrodeposition time and annealing temperature dependent characteristics have been studied.

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10

Lunca, Popa Petru. "Ln situ studies of spin electronics properties of magnetic nanocontacts fabricated using a Lab-on-chip approach." Strasbourg, 2010. http://www.theses.fr/2010STRA6072.

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Cette thèse est consacrée à l'étude des propriétés électriques dépendent du spin de contacts magnétiques ayant une taille de quelques atomes seulement. Nous avons développé un montage original et sophistiqué permettant de fabriquer et mesurer le transport électrique au travers de ces matériaux nanométriques de tailles ultimes. Les échantillons ont été obtenus par une combinaison de techniques de fabrication 'top-down', avec une construction de type « bottom-up »l'électrochimie pour ramener la distance et la taille a des dimensions atteignant quelques atomes. Une approche de type «Iab-on-chip»,

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11

Sabater, Carlos. "Theoretical and experimental study of electronic transport and structure in atomic-sized contacts." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/31544.

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12

Jacob, David. "Transporte de espín en nanocontactos y nanohilos." Doctoral thesis, 2007. http://hdl.handle.net/10045/10470.

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13

Chiu, Yi-Cheng, and 邱奕正. "Electrical Properties of Nanocontacts in ZnO Nanowire Nanoelectronics." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/6m5b56.

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碩士<br>國立交通大學<br>電子物理系所<br>96<br>Electrical properties of two-probe ZnO nanowire devices have been studied recently. Since the reduced contact area could magnify electrical contributions, the electrical properties at the nanocontacts of the nanowire devices should be investigated thoroughly. In this work, we adopted standard e-beam lithography and used 40-nm diameter ZnO nanowires to fabricate two-contact devices. Current-voltage (I-V) behaviors of these nanowire devices were obtained at various temperatures. We found that the devices could be categorized into two types according to their room-

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14

Sarau, George [Verfasser]. "Spin dependent transport in cobalt nanocontacts / von George Sarau." 2008. http://d-nb.info/988580616/34.

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15

Tabrizi, Mahdi Farshchi [Verfasser]. "On the adhesion between fine particles and nanocontacts : an atomic force microscope study / vorgelegt von Mahdi Farshchi Tabrizi." 2007. http://d-nb.info/983079323/34.

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