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MAGNETIC STATES IN Co RICH FCC CoMn ALLOYS

机译:富钴FCC CoMn合金中的磁态

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We report on the results of the ab initio calculations on the CO_(0.95)Mn_(0.05) alloy in chemically disordered state. Calculations are carried out within density-functional theory and the coherent potential approximation (CPA). We show that the magnetic coupling between the Co and Mn atoms are of ferromagnetic (FM) type for large lattice parameters while for lower ones are antiferromagnetic (AF). The coupling between Mn atoms is found to be FM for all lattice parameters. No chemically ordering is seen, all sites in the fcc unit cell being magnetically equivalent. The results are discussed in the framework of the disordered local moment (DLM) model.
机译:我们报告化学无序状态的CO_(0.95)Mn_(0.05)合金从头算的结果。在密度泛函理论和相干势近似(CPA)中进行计算。我们显示,对于大晶格参数,Co和Mn原子之间的磁耦合为铁磁(FM)类型,而对于较低的参数,则为反铁磁(AF)。对于所有晶格参数,发现Mn原子之间的耦合为FM。没有看到化学有序,fcc晶胞中的所有位点在磁性上都是等效的。在无序局部矩(DLM)模型的框架中讨论了结果。

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