Journal ArticleDOI
Spin-Dependent Tunneling in Self-Assembled Cobalt-Nanocrystal Superlattices
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TLDR
Self-assembled devices composed of periodic arrays of 10-nanometer-diameter cobalt nanocrystals display spin-dependent electron transport and low-energy spin-flip scattering suppresses magnetoresistance with increasing temperature and bias-voltage.Abstract:
Self-assembled devices composed of periodic arrays of 10-nanometer-diameter cobalt nanocrystals display spin-dependent electron transport. Current-voltage characteristics are well described by single-electron tunneling in a uniform array. At temperatures below 20 kelvin, device magnetoresistance ratios are on the order of 10%, approaching the maximum predicted for ensembles of cobalt islands with randomly oriented preferred magnetic axes. Low-energy spin-flip scattering suppresses magnetoresistance with increasing temperature and bias-voltage.read more
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Conjugated polymer-based organic solar cells
TL;DR: This review gives a general introduction to the materials, production techniques, working principles, critical parameters, and stability of the organic solar cells, and discusses the alternative approaches such as polymer/polymer solar cells and organic/inorganic hybrid solar cells.
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Prospects of Colloidal Nanocrystals for Electronic and Optoelectronic Applications
TL;DR: Nanocrystals (NCs) discussed in this Review are tiny crystals of metals, semiconductors, and magnetic material consisting of hundreds to a few thousand atoms each that are among the hottest research topics of the last decades.
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Graphene based materials: Past, present and future
TL;DR: Graphene and its derivatives are being studied in nearly every field of science and engineering as mentioned in this paper, and recent progress has shown that the graphene-based materials can have a profound impact on electronic and optoelectronic devices, chemical sensors, nanocomposites and energy storage.
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Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation
TL;DR: C coupled thermal–mechanical numerical models are used to show that these two processes—channel flow and ductile extrusion—may be dynamically linked through the effects of surface denudation focused at the edge of a plateau that is underlain by low-viscosity material.
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Chemical synthesis of magnetic nanoparticles
TL;DR: Recent advances in the synthesis of various magnetic nanoparticles using colloidal chemical approaches are reviewed and ferrite nanoparticles have been synthesized by the thermal decomposition of organometallic precursors followed by oxidation or by low-temperature reactions inside reverse micelles.
References
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Journal ArticleDOI
Monodisperse FePt Nanoparticles and Ferromagnetic FePt Nanocrystal Superlattices
TL;DR: Thermal annealing converts the internal particle structure from a chemically disordered face- centered cubic phase to the chemically ordered face-centered tetragonal phase and transforms the nanoparticle superlattices into ferromagnetic nanocrystal assemblies that can support high-density magnetization reversal transitions.
Journal ArticleDOI
Exchange-biased magnetic tunnel junctions and application to nonvolatile magnetic random access memory (invited)
Stuart S. P. Parkin,Kevin P. Roche,Mahesh G. Samant,P. M. Rice,Robert Beyers,Roy Edwin Scheuerlein,Eugene J. O'Sullivan,Stephen L. Brown,J. Bucchigano,D. W. Abraham,Yu Lu,M. Rooks,Philip L. Trouilloud,R. A. Wanner,William J. Gallagher +14 more
TL;DR: In this paper, exchange biased magnetic tunnel junction (MTJ) structures are shown to have useful properties for forming magnetic memory storage elements in a novel cross-point architecture, which exhibit very large magnetoresistive (MR) values exceeding 40% at room temperature, with specific resistance values ranging down to as little as ∼60 Ω(μm)2.
Journal ArticleDOI
Hopping Conductivity in Granular Metals
Ping Sheng,B. Abeles,Y. Arie +2 more
TL;DR: In this paper, it was shown that the observed temperature dependence of low-field conductivity in granular metals can be attributed to a relationship between the separation of neighboring metal grains and the electrostatic energy required to create a positive-negative charged pair of grains.
Journal ArticleDOI
Electrical Conduction Mechanism in Ultrathin, Evaporated Metal Films
C. A. Neugebauer,M. B. Webb +1 more
TL;DR: In this paper, the authors investigated the electrical conduction mechanism in the film plane of ultrathin, evaporated metal films and showed that the conductivity depends exponentially on reciprocal temperature, and it should be independent of field at low fields.