Magnetic properties and Curie temperatures of disordered Heusler compounds: Co(1+x)Fe(2-x)Si
Julia Erika Fischer (1), Julie Karel (1), Simone Fabbrici (2), Peter, Adler (1), Siham Ouardi (1), Gerhard H. Fecher (1), Franca Albertini (2),, Claudia Felser (1) ((1) Max Planck Institute for Chemical Physics of Solids,, Dresden
TL;DR
This study investigates the magnetic properties and Curie temperatures of disordered Co(1+x)Fe(2-x)Si Heusler compounds, revealing the highest Tc in Co1.5Fe1.5Si and emphasizing the role of local atomic environments.
Contribution
It provides new insights into how atomic disorder influences magnetic moments and Curie temperatures in Co-Fe-Si Heusler alloys, with detailed spectroscopic analysis.
Findings
Highest Tc of 1069 K in Co1.5Fe1.5Si
Magnetic moments increase with valence electrons
Local atomic order affects magnetic properties
Abstract
The local atomic environments and magnetic properties were investigated for a series of Co(1+x)Fe(2-x)Si (0<x<1) Heusler compounds. While the total magnetic moment in these compounds increases with the number of valance electrons, the highest Curie temperature (Tc) in this series was found for Co1.5Fe1.5Si, with a Tc of 1069 K (24 K higher than the well known Co2FeSi). 57Fe M\"ossbauer spectroscopy was used to characterize the local atomic order and to estimate the Co and Fe magnetic moments. Consideration of the local magnetic moments and the exchange integrals is necessary to understand the trend in Tc.
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