Magnetism of (FeCo)Si alloys: Extreme sensitivity on crystal structure

作     者：M. P. J. Punkkinen K. Kokko M. Ropo I. J. Väyrynen L. Vitos B. Johansson J. Kollar 

作者机构：Department of Physics University of Turku FI-20014 Turku Finland Graduate School of Materials Research Turku Finland Applied Materials Physics Department of Materials Science and Engineering Royal Institute of Technology SE-10044 Stockholm Sweden Condensed Matter Theory Group Physics Department Uppsala University SE-75121 Uppsala Sweden Research Institute for Solid State Physics and Optics P.O. Box 49 H-1525 Budapest Hungary AB Sandvik Materials Technology SE-811 81 Sandviken Sweden 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2006年第73卷第2期

页      面：024426-024426页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

摘      要：Theoretical results for (FeCo)Si substitutional random alloys, obtained within the framework of the exact muffin-tin orbitals method in combination with the coherent potential approximation, are presented. For concentration range 0.1x0.9, the magnetic structure of Fe1−xCoxSi is found to be almost degenerate, which is reflected in extreme sensitivity of the local magnetic moments on the internal structure parameters and lattice constant. Results are analyzed and discussed using Stoner, covalent magnetism, and rigid band models. In Fe-rich and in Co-rich alloys, the composition dependence of the magnetic moments can be understood in terms of a simple model. It is shown that disorder has a significant effect on magnetism in (FeCo)Si alloys.