论文标题
潜在的硬性金属间质量中静脉内本质上弱的磁各向异性
Intrinsically weak magnetic anisotropy of cerium in potential hard-magnetic intermetallics
论文作者
论文摘要
基于葡萄岩的金属层目前引起了极大的兴趣，作为现有的高性能磁铁的替代品，其中包含稀缺的稀有稀土元素。然而，由于对近托效应的定量描述的难度，这些系统中CE的固有磁性特性是很少的，这是一种多体现象，其中传导电子屏幕以CE-4F矩屏幕为止。在这里，我们表明，CE-FE Interallals中的CE-4F外壳部分被部分掩盖了。氮量表通过氮的间隙完全抑制了CE-4F对磁各向异性的贡献，这与氮化在包含其他稀有地球元件的同源金属间质量中的影响形成鲜明对比，从而极大地增强了CE-4F的贡献。我们确定CE-4F单离子各向异性的全温度依赖性，并表明即使是未经检查的CE-4F矩也对室温固有的磁性硬度几乎没有任何贡献。因此，我们的研究建立了基于基于葡萄磁体的磁铁间机构潜力的基本限制。
Cerium-based intermetallics are currently attracting much interest as a possible alternative to existing high-performance magnets containing scarce heavy rare-earth elements. However, the intrinsic magnetic properties of Ce in these systems are poorly understood due to the difficulty of a quantitative description of the Kondo effect, a many-body phenomenon where conduction electrons screen out the Ce-4f moment. Here, we show that the Ce-4f shell in Ce-Fe intermetallics is partially Kondo screened. The Kondo scale is dramatically enhanced by nitrogen interstitials completely suppressing the Ce-4f contribution to the magnetic anisotropy, in striking contrast to the effect of nitrogenation in isostructural intermetallics containing other rare-earth elements. We determine the full temperature dependence of the Ce-4f single-ion anisotropy and show that even unscreened Ce-4f moments contribute little to the room-temperature intrinsic magnetic hardness. Our study thus establishes fundamental constraints on the potential of cerium-based permanent magnet intermetallics.
