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

Abstract

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:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1349327
Alternate Identifier(s):
OSTI ID: 1393524; OSTI ID: 1421285
Grant/Contract Number:  
FG02-04ER46152
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Carbon dioxide; Curie poin; tX-ray diffraction; Rietveld refinement; Crystal structure

Citation Formats

Jin, Y., Waybright, J., Kharel, P., Tutic, I., Herran, J., Lukashev, P., Valloppilly, S., and Sellmyer, D. J. Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co2TiSi. United States: N. p., 2017. Web. doi:10.1063/1.4974281.
Jin, Y., Waybright, J., Kharel, P., Tutic, I., Herran, J., Lukashev, P., Valloppilly, S., & Sellmyer, D. J. Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co2TiSi. United States. doi:10.1063/1.4974281.
Jin, Y., Waybright, J., Kharel, P., Tutic, I., Herran, J., Lukashev, P., Valloppilly, S., and Sellmyer, D. J. Wed . "Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co2TiSi". United States. doi:10.1063/1.4974281.
@article{osti_1349327,
title = {Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co2TiSi},
author = {Jin, Y. and Waybright, J. and Kharel, P. and Tutic, I. and Herran, J. and Lukashev, P. and Valloppilly, S. and Sellmyer, D. J.},
abstractNote = {The structural, magnetic and electron-transport properties of Co2Ti1-xFexSi (x = 0, 0.25, 0.5) ribbons prepared by arc-melting and melt-spinning were investigated. The rapidly quenched Co2Ti0.5Fe0.5Si crystallized in the cubic L21 structure whereas Co2Ti0.75Fe0.25Si and Co2TiFe0Si showed various degrees of B2-type disorder. At room temperature, all the samples are ferromagnetic, and the Curie temperature increased from 360 K for Co2TiSi to about 800 K for Co2Ti0.5Fe0.5Si. 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 Co2Ti1-xFexSi 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.},
doi = {10.1063/1.4974281},
journal = {AIP Advances},
number = 5,
volume = 7,
place = {United States},
year = {Wed Jan 11 00:00:00 EST 2017},
month = {Wed Jan 11 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4974281

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