Observation of three-dimensional magnetic-moment density distribution in hard magnetic materials by using synchrotron radiation and neutron diffraction

本文对c轴为磁硬轴的稀土铁磁体CeRh3B2的硬磁材料进行了同步x射线磁衍射实验，得到了hk0系列倒易晶格点的自旋和轨道磁形因子。我们把它们加起来，就得到了总的磁性外形系数。在文献中，我们用x射线磁衍射法结合了hk0系列的磁形因子和用极化中子衍射法结合了0kl系列的磁形因子，并对结合的磁形因子数据进行了最大熵分析。最后，成功地得到了磁矩的三维密度分布。对于Ce位，我们观察到了4f电子的磁矩分布。本研究提出了一种利用同步x射线磁衍射和极化中子衍射观察硬磁材料三维密度分布的实验方法。

We have performed synchrotron X-ray magnetic diffraction experiment of a hard-magnetic material of a rare-earth ferromagnet of CeRh3B2 in which c axis is a magnetically hard axis, and we have obtained spin and orbital magnetic form factors for reciprocal lattice points of hk0 series. We have obtained the total magnetic form factor by summing them up. We have combined X-ray the magnetic form factor for hk0 series by the X-ray magnetic diffraction with the magnetic form factor for 0kl series by the polarized neutron diffraction in the literature, and we have performed the maximum-entropy analysis to the combined magnetic form factor data. Finally three dimensional density distribution of the magnetic moment has been successfully obtained. For the Ce sites, magnetic-moment distribution of 4f electrons has been observed. This research has shown that an experimental method has been developed for observing three dimensional density distributions of hard magnetic materials by utilizing both synchrotron X-ray magnetic diffraction and polarized neutron diffraction.