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Geometric, electronic, and magnetic structure of Co/sub 2/FeSi: Curie temperature and magnetic moment measurements and calculations

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Geometric, electronic, and magnetic structure of Co/sub 2/FeSi: Curie temperature and magnetic moment measurements and calculations

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Título Geometric, electronic, and magnetic structure of Co/sub 2/FeSi: Curie temperature and magnetic moment measurements and calculations
Autor Wurmehl, Sabine
Fecher, Gerhard H.
Kandpal, Hem Chandra
Ksenofontov, Vadim
Felser, Claudia
Lin, Hong-Ji
Morais, Jonder
Abstract In this work a simple concept was used for a systematic search for materials with high spin polarization. It is based on two semiempirical models. First, the Slater-Pauling rule was used for estimation of the magnetic moment. This model is well supported by electronic structure calculations. The second model was found particularly for Co2 based Heusler compounds when comparing their magnetic properties. It turned out that these compounds exhibit seemingly a linear dependence of the Curie temperature as function of the magnetic moment. Stimulated by these models, Co2FeSi was revisited. The compound was investigated in detail concerning its geometrical and magnetic structure by means of x-ray diffraction, x-ray absorption, and Mössbauer spectroscopies as well as high and low temperature magnetometry. The measurements revealed that it is, currently, the material with the highest magnetic moment (6uB) and Curie temperature (1100 K) in the classes of Heusler compounds as well as half-metallic ferromagnets. The experimental findings are supported by detailed electronic structure calculations.
Contido em Physical review. B, Condensed matter and materials physics. Woodbury. Vol. 72, no. 18 (Nov. 2005), 184434 9p.
Assunto Física
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/104296
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