2022 Research in the Capitol
Chemical Substitution Induced Half-Metallicity in Heusler Alloys
Location
Iowa State House, Rotunda
Presentation Type
Poster Presentation (Electronic Copy Not Available)
Abstract
Half-metals are a class of materials that combine properties of electric conductors and insulators. Here we study CrMnSb0.5Si0.5. It is shown that the parent Heusler compound — a compound which consists of two transition metals and an element from the p-block — CrMnSb is not half-metallic in its ground state; however, it undergoes a half-metallic transition under a uniform compression of ~1.5%, which is something achievable in practice. We demonstrate a thermodynamic stability of this compound, its half-metallic electronic structure, and ferrimagnetic alignment. At the same time, it is shown that in thin-film geometry the spin-polarization of this material is reduced due to the emergence of surface states in the minority-spin energy gap. This research is supported by the National Science Foundation (NSF) under Grant Numbers 2003828 and 2003856 via DMR and EPSCoR.
Start Date
21-2-2022 11:30 AM
End Date
21-2-2022 1:30 PM
Event Host
University Honors Programs, Iowa Regent Universities
Faculty Advisor
Paul Shand
Department
Department of Chemistry and Biochemistry
Copyright
©2022 Lukas Stuelke
File Format
application/pdf
Recommended Citation
Stuelke, Lukas, "Chemical Substitution Induced Half-Metallicity in Heusler Alloys" (2022). Research in the Capitol. 6.
https://scholarworks.uni.edu/rcapitol/2022/all/6
Chemical Substitution Induced Half-Metallicity in Heusler Alloys
Iowa State House, Rotunda
Half-metals are a class of materials that combine properties of electric conductors and insulators. Here we study CrMnSb0.5Si0.5. It is shown that the parent Heusler compound — a compound which consists of two transition metals and an element from the p-block — CrMnSb is not half-metallic in its ground state; however, it undergoes a half-metallic transition under a uniform compression of ~1.5%, which is something achievable in practice. We demonstrate a thermodynamic stability of this compound, its half-metallic electronic structure, and ferrimagnetic alignment. At the same time, it is shown that in thin-film geometry the spin-polarization of this material is reduced due to the emergence of surface states in the minority-spin energy gap. This research is supported by the National Science Foundation (NSF) under Grant Numbers 2003828 and 2003856 via DMR and EPSCoR.
