Effect of Fe substitution on the structural, magnetic and electron-transport properties of half-metallic Co2TiSi

Authors

Y. Yin, University of Nebraska - Lincoln
J. Waybright, South Dakota State UniversityFollow
P. Kharel, South Dakota State UniversityFollow
I. Tutic, University of Northern IowaFollow
J. Herran, University of Northern IowaFollow
P. Lukashev, University of Northern IowaFollow
S. Valloppilly, Nebraska Center for Materials and NanoscienceFollow
D. J. Sellmyer, University of Nebraska - LincolnFollow

Document Type

Article

Keywords

Carbon dioxide, Curie point, x-ray diffraction, Rietveld refinement, Crystal structure

Journal/Book/Conference Title Title

API Advances

Volume

7

Issue

5

Abstract

The structural, magnetic and electron-transport properties of Co₂Ti_1-xFe_xSi (x = 0, 0.25, 0.5) ribbons prepared by arc-melting and melt-spinning were investigated. The rapidly quenched Co₂Ti_0.5Fe_0.5Si crystallized in the cubic L2₁ structure whereas Co₂Ti_0.75Fe_0.25Si 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 Co₂Ti_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 Co₂Ti_1-xFe_xSi compound remains nearly half-metallic for x ≤ 0.5. The predicted large band gaps and high Curie temperatures much above room temperature make these materials promising for room temperature spintronic and magnetic applications.

Department

Department of Physics

Comments

First published in AIP Advances, v. 7 n. 5 (2017), published by American Institute of Physics. DOI: 10.1063/1.4974281

Original Publication Date

1-2017

DOI of published version

10.1063/1.4974281

Repository

UNI ScholarWorks, University of Northern Iowa, Rod Library

Copyright

©2017 Y. Jin, J. Waybright, P. Kharel, I. Tutic, J. Herran, P. Lukashev, S. Valloppilly, and D. J. Sellmyer. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Date Digital

2017

Language

en

File Format

application/pdf

Recommended Citation

Yin, 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" (2017). Faculty Publications. 21.
https://scholarworks.uni.edu/phy_facpub/21