Effect of short-range order on electronic and magnetic properties of disordered Co-based alloys

Abstract

Abstract. We here study electronic structure and magnetic properties of disordered CoPd and CoPt alloys using Augmented Space Recursion technique coupled with the tight-binding linearized muffin tin orbital (TB-LMTO) method. Effect of short range ordering present in disordered phase of alloys on electronic and magnetic properties has been discussed. We present results for magnetic moments, Curie temperatures and electronic band energies with varying degrees of short range order for different concentrations of Co and try to understand and compare the magnetic properties and ordering phenomena in these systems.

Finite-temperature magnetism ofFexPd1−xandCoPolesya1, Mankovsky2, Šipr3 et al. 2010Phys. Rev. B442370View full textAdd to dashboardCite

“…The Curie temperatures T C of the investigated Co Experimental results [47,48] earlier by relying on the semi-empirical Mohn-Wohlfarth theory [51] were taken from Qi et al [49] for fcc Co, from Kashyap et al [22] for ordered Co-Pt compounds and from Ghosh et al [50] for disordered Co x Pt 1−x alloys. Experimental values [47,48] are shown for comparison.…”

Magnetic properties of X–Pt (X = Fe,Co,Ni) alloy systems

“…Therefore it is not surprising that our calculations show better agreement with experiments. According to the calculation of Shick et al [73] using the fully relativistic linearized muffin-tin orbital based coherent potential approximation (LMTO-CPA) method the average and partial magnetic moments of Co and Pt in Co 50 Pt 50 are 1.07, 1.79 and 0.35 µ B , respectively, while the value of Ghosh et al [39] using ASR are 1.05, 1.85 and 0.24 µ B for the same. Our values in this case are 1.05, 1.80 and 0.29.…”

“…Saha et al [38] implemented this within the framework of the recursion method. Later Ghosh et al [39] extended the technique to magnetic Co-Pt and Co-Pd systems. In the present paper we have carried out charge-self-consistent calculations based on this generalized ASR technique to examine the short-range ordering effect in Fe-Pt, Co-Pt and Ni-Pt systems.…”

Electronic structure and magnetism of Co1−xPdx and Ni1−xPdx ordered alloys

“…During the last decades a lot of efforts have been made towards this direction. However most of the work was concentrated on the disordered Pd alloys with the model calculations [10][11][12], and less attention was paid to the ordered alloys with the ab initio calculations.…”