Faculty Publications

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 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. 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

Date Digital

2017

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

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

Language

en

File Format

application/pdf

Included in

Physics Commons

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