1,721,025 research outputs found
TAILORING THE MAGNETIC DOMAIN PATTERNS AND MAGNETIC ANISOTROPY OF SPUTTERED TbFeGa ALLOYS
No full textThe control of the domain patterns in systems with perpendicular magnetic anisotropy (PMA) is of great interest because of their applications on magnetic storage or spintronic devices.
Amorphous Tb-Fe alloys exhibit a pretty large PMA constant that reachs 106 J/m3. Recently, it has been reported a constant of at least 1×105 J/m3 in TbFeGa alloys [1]. We have deposited TbFeGa films by cosputtering using two targets with a composition of TbFe2 and Fe3Ga. Two series of samples were obtained by applying a different type of power source (DC or pulsed) in each target. The evaporation of TbFe2 by means of the DC source enhances the out of plane component of the magnetization. The results indicate that this can be due to the Tb enrichment of the TbFe2-based phases present in the alloys.
Magnetic force microscopy (MFM), which shows the presence of stripe domains, has been used to investigate the rotatable anisotropy of these films. A magnetic field of variable intensity placed at 90 degrees with respect to the stripes direction has been applied, while in-field MFM images were recorded. The results clearly show the correlation between OOP and rotatable anisotropies, which allows to tailor the magnetic domain patterns by changing the films preparation conditions
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
TAILORING THE MAGNETIC DOMAIN PATTERNS OF SPUTTERED TbFeGa ALLOYS
No full textThe control of the domain patterns in systems with perpendicular magnetic anisotropy (PMA) is of great interest because of their applications on magnetic storage or spintronic devices. Different approaches are investigated to achieve a high magnetic stability. In systems comprised of noble metals such as Pt or Pd, the principal drawback is the high spin orbit interaction that increases the magnetic damping constant.
Amorphous Tb-Fe alloys exhibit a pretty large PMA constant that reaches 106 J/m3. Recently, it has been reported a constant of at least 1×105 J/m3 in TbFeGa alloys [1]. We have deposited TbFeGa films by cosputtering using two targets with a composition of TbFe2 and Fe3Ga. Two series of samples were obtained by applying a different type of power source (DC or pulsed) in each target. In particular, the evaporation of TbFe2 by means of the DC source enhances the out of plane component of the magnetization (Fig. 1). The results indicate that this can be due to the Tb enrichment of the TbFe2-based phases present in the alloys. Therefore, the magnetic domain pattern can be tailored by means of the composition and the type of power source used in each sputtering target
STRIPES ROTATION AND MAGNETIC ANISOTROPY OF TbFeGa ALLOYS
No full textMagnetic films with perpendicular magnetic anisotropy (PMA) are attractive materials for applications in the fields of high density magnetic recording and spintronics. The magnetic domains orientation is known to affect the signal propagation through these materials when used in spintronic devices.
Recently, the PMA of TbFeGa alloys has been demonstrated [1]. In this work TbFeGa films were deposited by cosputtering, using two targets of TbFe2 and Fe3Ga. The effect of the type of power source (DC or pulsed) used in each target on the magnetic domain configuration has been investigated. It was found that the evaporation conditions strongly influence the out of plane (OOP) anisotropy of the films. Magnetic force microscopy (MFM), which shows the presence of stripe domains (fig. 1), has been used to investigate the rotatable anisotropy of these alloys. A magnetic field of variable intensity placed at 90 degrees with respect to the stripes direction has been applied, while in-field MFM images were recorded. The results clearly show the correlation between OOP and rotatable anisotropies, which allows to control the stripe domains rotation process and therefore the stripes orientation, by changing the films preparation conditions
Variations on the Author
Get PDF“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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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