Phase equilibria and magnetic properties of Heusler-type ordered phases in the Co–Mn–Ga ternary system

Atomic ordering, magnetic properties, and electronic structure of Mn2CoGa Heusler alloy

“…from the value of the spontaneous magnetization of 47.8 A • m 2 kg −1 . The present value matched well to those reported by Minakuchi et al [35] and Zhang et al [17]. It was also close to the integer number of 2, which is expected from the Slater-Pauling rule predicted by Galanakis et al [43] where the total magnetic moment M t is expected from the relation M t = Z t − 24; here, Z t is the total number of valence electrons.…”

“…The inset shows the temperature derivative of the magnetization curve dM/dT. Here, the Curie temperature (T C ) is defined as the minimum point in the dM/dT − T curve as indicated by the arrow at 741 K. The observed peak at higher temperatures in the DSC curve was the result of an L2 1 -B2 order-disorder phase transition because it has been reported by Minakuchi et al that the phase transition temper ature (T t ) of Mn 51 Co 25 Ga 24 (at.%) is 1048 K [35], which is very close to the present value. Since the value of T t was confirmed, we decided the additional annealing temperature to heighten the degree of order.…”

“…The reason is that the single phase is easily obtained at lower temperatures and it has been already reported to indicate half-metallic DOS from theoretical calculations [7-9, 17, 34]. In our previous investigation of the ternary phase diagram for an Mn-Co-Ga system, phase equilibrium at 1073, 1173, and 1273 K in the entire composition region of Mn-Co-Ga was reported [35]. In addition, high-angle annular dark-field-scanning transmission electron microscopy observations were complementally carried out for a Mn 2 CoGa alloy, and it was suggested that it favored an L2 1b -type structure rather than the Hg 2 CuTi or L2 1 -type structures.…”

Effect of Fe and Co substitution on the martensitic stability and the elastic, electronic, and magnetic properties ofMn2NiGa: Insights fromab initiocalculations

“…From the MCS results, we find that all the end compounds obtained by complete substitution of Fe or Co in any of the sites have very high T c , the largest being close to 900K for Mn 2 NiCo. The qualitative variation of T c for Mn 2 (Ni 1−x Co x )Ga agrees well with the experiment 32,72 although the MCS results are little overestimated. The quantitative agreement be- tween the MCS results and the experimental results 31,63 for (Mn 2−x Fe x )NiGa are better.…”

Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism

“…3(c) is similar to the line shape of Heusler alloy Co2MnGa [32]. From the view point of ternary phase diagram of Co-Mn-Ga [33], it is evident that the Co-rich Heusler alloy exhibits the ferromagnetic phase. Second, the interfacial diffusion of Mn atoms has to be considered.…”