Effect of doping on B2-phase ordering temperature of Co-based heusler alloy: An AB initio stud

Author

Xu, X. ; Zhao, B. ; Wu, Y. ; Jiang, Y.

Author_Institution

Sch. of Mater. Sci. & Eng., Univ. of Sci. & Technol. Beijing, Beijing, China

fYear

2015

fDate

11-15 May 2015

Firstpage

1

Lastpage

1

Abstract

Co₂FeAl_0.5Si_0.5 (CFAS) [1, 2], a full Heusler alloy with theoretical 100% spin polarization, has attracted great attention for its wide study in magnetic tunneling junctions and spin valves. Recently studies [1, 2, 3] have proved that B2 and L2₁-phase ensure the half-metallic property, while a range of 400~600 °C annealing temperature is needed to obtain the ordered phases. High annealing temperature is no doubt unfavorable for both magnetic properties and applications. Therefore, a low temperature ordering method is needed to decrease the ordering temperature from disordered A2-phase to ordered B2 or L2₁ phases on the way to large scale industrial process. In this paper, we offer a proposal to decrease the annealing temperature of CFAS from A2 to B2 phase by Pt doping based on the first-principles calculations using VASP.

Keywords

ab initio calculations; aluminium alloys; annealing; cobalt alloys; doping; iron alloys; order-disorder transformations; silicon alloys; A2 phase; B2-phase ordering temperature; Co₂FeAl_0.5Si_0.5:Pt; L2₁ phase; VASP; ab initio calculations; annealing temperature; doping effect; first-principles calculations; full Heusler alloy; low temperature ordering method; spin polarization; Annealing; Doping; Iron; Magnetic properties; Silicon; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference (INTERMAG), 2015 IEEE

Conference_Location

Beijing

Print_ISBN

978-1-4799-7321-7

Type

conf

DOI

10.1109/INTMAG.2015.7156786

Filename

7156786