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Half-metallic ferromagnetism with high magnetic moment and high Curie temperature in Co$_2$FeSi

Sabine Wurmehl·Gerhard H. Fecher·Vadim Ksenofontov·Frederick Casper·Ullrich Stumm·Claudia Felser·Hong-Ji Lin
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Abstract

Co$_2$FeSi crystallizes in the ordered L2$_1$ structure as proved by X-ray diffraction and Mößbauer spectroscopy. The magnetic moment of Co$_2$FeSi was measured to be about $6μ_B$ at 5K. Magnetic circular dichroism spectra excited by soft X-rays (XMCD) were taken to determine the element specific magnetic moments of Co and Fe. The Curie temperature was measured with different methods to be ($1100\pm20$)K. Co$_2$FeSi was found to be the Heusler compound as well as the half-metallic ferromagnet with the highest magnetic moment and Curie temperature.

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Sabine Wurmehl, Gerhard H. Fecher, Vadim Ksenofontov, Frederick Casper, Ullrich Stumm, Claudia Felser, Hong-Ji Lin. 2005-11-18. Half-metallic ferromagnetism with high magnetic moment and high Curie temperature in Co$_2$FeSi. https://doi.org/10.1063/1.2167330

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