Experimental and theoretical evidences that atomic disorder suppresses half-metallicity of Heusler compounds
authors Caraballo-Vivas, RJ; Tedesco, JCG; Checca, NR; Fortunato, NM; Goncalves, JN; Sanchez, DR; Carvalho, AMG; Amaral, JS; Reis, MS
nationality International
journal INTERMETALLICS
keywords RAY-POWDER DIFFRACTION; ELECTRONIC-STRUCTURE; MAGNETIC-PROPERTIES; XRD1 BEAMLINE; MAGNETORESISTANCE; SPINTRONICS; ORDER
abstract Half-metallic compounds present two spin bands with contrasting behaviors, resulting in 100% of spin polarization at the Fermi level; property of crucial importance for applications in spintronic devices. Materials presenting this characteristic are, for instance, some Heusler compounds, mainly Co-2-based compounds, which have interesting properties, such as T-C above 1000 K and high values of saturation magnetization. However, atomic disorder can affect the half-metallic properties of these materials, decreasing their potential application in spintronic devices. Our aim is to evaluate the role played by atomic disorder in Co2FeSi, which has a Curie temperature of 1100 K and saturation magnetization close to 6 mu(B). In order to experimentally probe the effects of atomic disorder in this material, samples were subjected to different annealing times, with a subsequent quantification of the disorder degree by means of anomalous X-ray diffraction (AXRD) and Mossbauer spectroscopy. In addition, DFT calculations were performed to provide information on the density of states (DoS) at the Fermi energy under those disorder conditions. This work reveals how disorder plays an important role on the thermodynamic and electronic properties of half-metallic Heusler compounds.
publisher ELSEVIER SCI LTD
issn 0966-9795
year published 2019
volume 111
digital object identifier (doi) 10.1016/j.intermet.2019.106502
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000473374300018
  ciceco authors
  impact metrics
journal analysis (jcr 2017):
journal impact factor 3.420
5 year journal impact factor 2.969
category normalized journal impact factor percentile 76.037
dimensions (citation analysis):
altmetrics (social interaction):



 


Sponsors

1suponsers_list_ciceco.jpg