1,720,966 research outputs found
Magnetic Properties of some Rhombohedral RE-Co Compounds
No full textThe magnetic properties and the magnetocrystalline anisotropy of the rhombohedral RECo3, RE2Co7 and RE5Co19 systems (RE = Y, Nd) have been studied. It has been evidenced that the magnetic phenomenology is qualitatively the same in the different phases. The variation in composition only has a quantitative influence
Phenomenological analysis of the magnetocrystalline anisotropy of the Co sublattice in some rhombohedral and hexagonal intermetallic structures derived from the CaCu5 unit cell
No full textA comparative study of the saturation magnetization, Curie temperature, and magnetocrystalline anisotropy in several rhombohedral and hexagonal Y‐Co compounds was done. The considered phases YCo3, Y2Co7, Y5Co19 (rhombohedrals), YCo5+z, and Y2Co17 (hexagonals) are all derived from the hexagonal CaCu5 unit. The variation of the magnetic properties in the different compounds was found to be strongly correlated to the cobalt content. In particular the Co sublattice anisotropy varies linearly with the Co content in the phases, while it seems to be not affected by structural changes (rhombohedral‐hexagonal). The highest anisotropy of Co was found in YCo5, every modification of the CaCu5 cell resulting in a weakening of the overall axial anisotropy. An evaluation of the strength of the Co anisotropy in the 2c, 3g, and dumbbell sites was done using a phenomenological model
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
Magnetocrystalline Anisotropy and First-order Magnetization Processes in (Pr1-xNdx)2Fe14B Compounds
No full textThe magnetocrystalline anisotropy of the pseudobinary (Pr1-xNdx)2Fe14B compounds has been measured by using the singular point detection (SPD) technique. The measured temperature and composition dependence of the anisotropy field has been compared with the data obtained in CEF approximations using different sets of (Anm) parameters for Nd2Fe14B and Pr2Fe14B and by considering a linear combination of the anisotropy in the mixed system. The comparison is made by calculating the anisotropy constants, then the anisotropy field values, starting from the (Anm) parameters. Experimental and calculated data concerning the occurrence of spin reorientation transition (SRT) and of type 1 and type 2 first-order magnetisation processes (FOMP) as a function of composition have also been compared
Effect of Vanadium on the RE and Fe Sublattice Anisotropies in some REFe12-xVx (RE= Y, Er, Tb) Tetragonal Compounds
No full textThe compounds REFe12−xVx(RE=Y,Er,Tb) having the tetragonal crystal structure of ThMn12 exist in the composition range 1.5≤x≤4. The dependence of the magnetic properties on the vanadium content were investigated in order to evidence and study any influence of vanadium on the magnetic anisotropy of both iron and RE sublattices and, as a consequence, on the magnetic phase diagram of these systems. The influence of vanadium was found to be remarkable on Tc, Ms, and Fe anisotropy, which decrease in all the compounds with increasing V content. However the largest effect was observed on the RE anisotropy and particularly in TbFeV, where the anisotropy of the Tb sublattice is turned from planar to axial by increasing the vanadium concentration, thus giving rise to strong effects on the macroscopic magnetic behavior and on the magnetic phase diagram of these systems. The large variation of the spin reorientation transition temperature Tsr, observed by varying V content on both ErFeV and TbFeV, can justify the spread in the literature data which could be attributed to small not considered stoichiometry differences with respect to the nominal composition
Competing Anisotropies and Magnetization Processes in the Pseudoternary (HoxEr1-x)Fe10V2 Tetragonal System
No full textA study of temperature and composition dependence of the magnetic anisotropy in the tetragonal (HoxEr1−x)Fe10V2 polycrystalline compounds was made by means of the singular point detection technique. At 293 K the easy magnetization direction lies along the tetragonal c axis [001] in all the samples and the anisotropy field increases linearly with increasing Ho content. However, with decreasing temperature the competition among the anisotropy of the different magnetic sublattices gives rise to a spin reorientation transition axis to cone in Er containing samples. The TSR value increases with increasing Er content. A significant in‐plane anisotropy was found in all the compounds. This planar anisotropy is larger in HoFe10V2, where it favors the [100] direction of the basal plane, while in ErFe10V2 the [110] is the preferred direction. The difference between the anisotropy field along [100] and [110] directions was found to decrease with increasing Er content. A first‐order magnetization process of type 1 was observed below 120 K in all the compounds when the magnetic field is applied along the [100] direction
The Measurement of the Magnetic Anisotropy and some Related Properties in Hard Magnetic Materials
No full textSome methods developed at the MASPEC Institute for the
measurement of the anisotropy field, texture and single or
polydomain particle status in uniaxial ferromagnets are presented
Competing Interactions in Hexagonal PrxNd1-xCo5 Pseudobinary Intermetallic Compounds
No full textMeasurements of the cone magnetic structure in PrxNd1−xCo5 compounds show that the spin reorientation transition temperature from easy plane to easy cone and the low temperature value of the angle between the easy magnetization direction and the c-axis both decrease with decreasing Nd concentration. The observed behaviour of the magnetic anisotropy implies a particularly complex competition between a non-axial Pr and planar Nd anisotropy as well as the large Co axial anisotropy
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
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