1,721,038 research outputs found
Building a half-adder based on spin waves
Full text linkA magnonic directional coupler based on yttrium iron garnet could be used to create integrated magnonic nanocircuits for logic operations
Magnetic properties of thick synthetic antiferromagnets with different ferromagnetic layers
Full text linkSynthetic antiferromagnets (SAF) are versatile magnetic structures consisting of two ferromagnetic thin films with antiparallel magnetization, separated by a thin non-magnetic spacer. They are used in modern spintronics as building blocks of spintronic devices for data storage applications, computing, and as magnetic-field sensors. More recently, they have been proposed as media for efficient skyrmions and spin-waves propagation, and for spin-torque oscillators.
Tailoring their properties is therefore of fundamental importance for the development of novel nanomaterials. In this work, the magnetic properties of different types of SAFs are investigated via vibrating sample magnetometry, by changing the thickness of the layers. Importantly, while a decrease of the saturation and interlayer exchange coupling field for thicker systems is present, the desired antiferromagnetic coupling at remanence is still robust. These results suggest that by modulating the thickness of the layers, it is possible to finely engineer the SAF magnetic properties even in tens of nm-thick SAFs, enabling a new degree of freedom in the design and development of novel magnetic nanodevices
Review on magnonics with engineered spin textures
Full text linkSpin textures, such as non-uniform domain arrangements, domain walls and skyrmions are naturally occurring structures in magnetic materials. Recently, the unique properties of spin textures such as their reconfigurability, stability and scalability towards nanoscale dimensions, has sparkled the interests towards their use as active elements in spintronic devices. In the framework of magnonics, which aims to use spin waves (SWs) for carrying and processing information, using spin textures allows to harness an extremely rich phenomenology for designing new functionalities. In this review, we focus on the recent developments on the control and stabilization of engineered spin textures, and their applications in the field of magnonics. First, we introduce the main techniques used for stabilizing the spin textures and controlling their properties. Then we review the recent results on the use of engineered spin textures for guiding, emitting and manipulating SWs, and the recent proposals on the realization of complex functionalities using integrated spin-texture-based systems, which hint to possible future directions for technological prospects
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Dispositivo e metodo per la quantificazione di componenti corpuscolate e non corpuscolate del sangue
No full textLa presente invenzione riguarda un dispositivo e relativo metodo per la quantificazione, di componenti corpuscolate e non corpuscolate presenti in una soluzione contenente un campione di sangue, mediante la concentrazione e separazione magnetoforetica delle componenti di interesse dal resto del campione e la rivelazione impedenziometrica della quantità di tali componenti
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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