Trilayer Bethe lattices in the form of spin-(1/2,3/2,1/2)

The critical behaviors of the trilayer Bethe lattice in the form of spin-(1/2,3/2,1/2) with the exterior two layers consisting of spin-1/2 and the interior one having only spin-3/2 Ising spins are studied in terms of the recursion relations with either ferromagnetic or antiferromagnetic bilinear exchange interactions between the nearest-neighbor spins. The ground-state phase diagrams are calculated and it is found that the model presents six different ground state phase configurations. The thermal variations of the order-parameter and free energy are investigated, therefore, topologically different phase diagrams of the model are obtained. It is found that the model exhibits second- and first-order phase transitions, tricritical and bicritical points for the values of the coordination numbers q = 3, 4 and 6 and, the reentrant behavior for q = 4 and 6, respectively. (C) 2012 Elsevier B.V. All rights reserved

Investigation of Crystal Structure and Magnetic Properties of Ni2CrxTi1-xSi (0 ≤ x ≤ 1) Samples

Ni2CrxTi1-xSi (0 ≤ x ≤ 1) Heusler alloys were produced in an arc melting furnace within the stoichiometricratio. Crystal structure was determined according to XRD analysis results and SEM with EDS-Mapping phaseimages were taken. The magnetic characteristics of the material were found by using the M-T and M-Hgraphics for their magnetic properties: Linear behavior in the M-H curves clearly shows that the compoundsare paramagnetic.</p

An Experimental Characterization of Ni2TiSi and Ni2CrSi Full-Heusler Alloys Related to Structural and Magnetic Properties

Ni2TiSi and Ni2CrSi triple and full Heusler alloys were synthesized in an arc melting furnace within thedesired stoichiometric ratio. Crystal structure was investigated by XRD analysis and the results show that thesamples are in Fm-3m (cubic) space group. Surface morphology was obtained by SEM-Mapping phaseimages with EDS analysis results and samples have both major and minor phases. The magneticcharacteristics of the materials were determined by using the M-T and M-H graphics. Linear behavior in theM-H curves clearly shows that the compounds are paramagnetic.This study was supported by Erciyes University BAP Research Foundation under the project numbers FDK2017-7359.&nbsp;</p

Structural and magnetic characterisation of Co substituted Ni2MnSb Heusler alloy: effect of cobalt substitution on magnetism and Curie temperature

In this study, Ni2-xCoxMnSb full-Heusler alloys (1.00 <= x <= 1.75) were prepared by arc melting process, and examined by X-ray diffraction (XRD), scanning electron microscopy (SEM), and SQUID. The L2(1)crystal structure of the synthesised Heusler alloy was confirmed by XRD patterns, and it was observed that the use of Co instead of Ni caused a decrease in the interatomic distance. The magnetisation results revealed that all samples show ferromagnetic (FM) behaviour, and substitution Co for Ni leads to increasing FM interactions in the samples. The calculated magnetic moment per formula unit increase from 4.38 mu B(x = 1) to 5.17 mu B (x = 1.75). On the other hand, the increase in FM interaction caused an increase in ferromagnetic-paramagnetic (PM) phase transition (T-C) temperatures from 513 (x = 1) to 568 K (x = 1.75). The ability to control the Curie temperature with Co substitution makes these alloys suitable candidates for future spintronics and magnetoelectronic applications

Crystal Structures and Magnetic Properties of the Co2Mn1-x V-x Sb (0 <= x <= 1 ) Heusler Compounds

Crystal structure and magnetic properties of the Co2Mn1-x V-x Sb (0 <= x <= 1) Heusler compounds have been studied by X-ray powder diffraction (XRD), magnetometric measurements, and full-potential linearized augmented plane wave (FP-LAPW) method. All compounds crystallize in a cubic Cu2MnAl-type crystal structure with the space group Fm-3m. The samples for x < 0.8 have the Curie temperatures above room temperature, while the Curie temperature is observed at 68 K for the sample with x = 0.8. The saturation magnetization at 5 K decreases linearly with increasing vanadium concentration x. The values of the saturation magnetization obtained by FP-LAPW-local density approximation (LDA) calculations are in better agreement with the experimental results compared with the results obtained by FP-LAPW-generalized gradient approximation (GGA) calculations