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arxiv: 1604.06235 · v1 · pith:57UKMIORnew · submitted 2016-04-21 · ❄️ cond-mat.mtrl-sci

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
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Dresden Germany (2) Institute of Materials for Electronics Magnetism Parma Italy)
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classification ❄️ cond-mat.mtrl-sci
keywords magneticcompoundslocalatomiccurieheuslermomentsproperties
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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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