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Competition between Magnetic Structures in the Fe-Rich FCC FeNi Alloys

机译:Fe-FCC FeNi合金中磁性结构之间的竞争

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摘要

We report on the results of a systematic ab initio study of the magnetic structure of Fe rich fcc FeNi binary alloys for Ni concentrations up to 50 at. %. Calculations are carried out within density-functional theory using two complementary techniques, one based on the exact muffin-tin orbital theory within the coherent potential approximation and another one based on the projector augmented-wave method. We observe that the evolution of the magnetic structure of the alloy with increasing Ni concentration is determined by a competition between a large number of magnetic states, collinear as well as noncollinear, all close in energy. We emphasize a series of transitions between these magnetic structures, in particular we have investigated a competition between disordered local moment configurations, spin spiral states, the double layer antiferromagnetic state, and the ferromagnetic phase, as well as the ferrimagnetic phase with a single spin flipped with respect to all others. We show that the latter should be particularly important for the understanding of the magnetic structure of the Invar alloys.
机译:我们报告了富铁的fcc FeNi二元合金的磁性结构从头开始研究的结果,其中Ni的浓度最高为50 at。 %。在密度泛函理论中,使用两种互补技术进行计算,一种基于相干势近似内的精确松饼-锡轨道理论,另一种基于投影仪增强波方法。我们观察到,随着Ni浓度的增加,合金的磁性结构的演化是由大量的,处于共线态和非共线态的磁态之间的竞争所决定的,这些竞争态都在能量上接近。我们强调了这些磁性结构之间的一系列过渡,特别是研究了无序局部矩构型,自旋螺旋态,双层反铁磁态和铁磁相之间的竞争,以及单次自旋翻转的亚铁磁相之间的竞争。相对于其他所有人。我们表明,后者对于理解因瓦合金的磁性结构尤为重要。

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