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Title: Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co 2TiSi

The structural, magnetic and electron-transport properties of Co 2Ti 1-xFe xSi (x = 0, 0.25, 0.5) ribbons prepared by arc-melting and melt-spinning were investigated. The rapidly quenched Co 2Ti 0.5Fe 0.5Si crystallized in the cubic L2 1 structure whereas Co 2Ti 0.75Fe 0.25Si and Co 2TiFe 0Si showed various degrees of B2-type disorder. At room temperature, all the samples are ferromagnetic, and the Curie temperature increased from 360 K for Co 2TiSi to about 800 K for Co 2Ti 0.5Fe 0.5Si. The measured magnetization also increased due to partial substitution of Fe for Ti atoms. The ribbons are moderately conducting and show positive temperature coefficient of resistivity with the room temperature resistivity being between 360 μΩcm and 440 μΩcm. The experimentally observed structural and magnetic properties are consistent with the results of first-principle calculations. Our calculations also indicate that the Co 2Ti 1-xFe xSi compound remains nearly half-metallic for x ≤ 0.5. In conclusion, the predicted large band gaps and high Curie temperatures much above room temperature make these materials promising for room temperature spintronic and magnetic applications.
Authors:
 [1] ; ORCiD logo [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [1] ;  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States); South Dakota State Univ., Brookings, SD (United States)
  3. Univ. of Northern Iowa, Cedar Falls, IA (United States)
Publication Date:
Grant/Contract Number:
FG02-04ER46152
Type:
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Carbon dioxide; Curie poin; tX-ray diffraction; Rietveld refinement; Crystal structure
OSTI Identifier:
1349327
Alternate Identifier(s):
OSTI ID: 1393524; OSTI ID: 1421285