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Magnetocrystalline anisotropy of the 3d sublattice in the cubic intermetallic system Zr6Co23-xMx (M= Fe, Ni)
No full textThe magnetocrystalline anisotropy behavior of the 3d sublattice was studied in the face‐centered‐cubic system Zr6Co23−xMx (M=Fe,Ni). A remarkably high anisotropy field was required to saturate the magnetization along both the [100] and [110] hard directions. The values found are, respectively, HA=43 kOe and HA=33 kOe at 293 K for Zr6Co23. The partial substitution of Co with Ni results in a substantial increase of the anisotropy while saturation magnetization and Curie temperature decrease linearly. On the contrary, the partial substitution with Fe gives rise to a decrease of HA and to an increase of both σs and Tc. The 10th power law does not apply to the functional temperature dependence of the resulting anisotropy in this system
Multiple first-order magnetic field induced transitions in Pr2(CoxFe1-x)17 [x = 0, 0.1, 0.2]
No full textStudy of the iron contribution to the 3d-sublattice anisotropy in some uniaxial YCoFe structures derived from the CaCu5 unit cell
No full textThe effects of the Fe substitution for Co on the anisotropy of uniaxial structures (YCo3, Y2Co7, Y5Co19, YCo5) all derived from the parent CaCu5 unit cell were studied. The unique Singular Point Detection (SPD) technique was used to measure temperature and composition dependence of the anisotropy. A characteristic behaviour of both Co and Fe anisotropies was individuated. The overall Fe sublattice anisotropy is always opposite and 2–3 times larger than that of Co. From the temperature behaviour of the anisotropy constant (K1), spin reorientation transitions (SRT) were predicted at temperature values which depend on Fe content. ac susceptibility measurements seem to confirm the presence of SRT. The magnetic phase diagrams of mixed Y-Co-Fe compounds were derived
Structural features of the intermetallic compounds Pr2M17 (M=Fe, Co) and implications on magnetic properties
No full textNovel structural features have been shown by single-crystal x-ray diffraction ~XRD! in Pr 2 Fe 17 and Pr 2 Co 17 intermetallic compounds. Some of these features are common characteristics of the two compounds, while others appear to be specific to the cobalt- or iron-based phase. It has been found that in both cases the suitable space group for the description of the rhombohedral Pr 2 M 17 (M5Fe, Co) structure is R3m and not the usually considered centrosymmetric R3 ̄ m group. This results in a puckered arrangement of the M atoms in the 3d-metal plane and in the nonsymmetric position of the two crystallographically independent Pr atoms with respect to the 3d metal atoms in the mixed Pr-M layer. The Pr-Fe compounds are always stoichiometric even in the presence of excess Pr in the starting nominal composition. The real structure is characterized by a very frequent occurrence of obverse-reverse twinning domains stacked along the c axis. The presence of multiple Pr sites and, as a consequence, of different contributions to the magnetocrystalline anisotropy is the key to explaining the occurrence of a double field-induced transition in the magnetization curve of Pr 2 Fe 17 compounds. In contrast some excess Pr was found in the cobalt compounds. Two groups of samples having, respectively, low (.1%) and high (.5%) excess Pr and consequently different anisotropy field values were found, depending on the starting nominal composition. The origin of the differences observed in Fe and Co compounds is discussed
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
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