Structural Study of Magnetic Amorphous Alloy by X-ray Magnetic Scattering

由于非晶合金的衍射强度远弱于荧光强度，本研究项目的初始目标--磁性非晶合金的X射线磁衍射研究已被证明是非常困难的。然后我们有了以下两个新目标，并且已经实现了它们。1.铁磁单晶中自旋磁矩和轨道磁矩形状因子的分离。2. 4f和3d元素的新型磁性非晶态合金的制备及其物理（磁性、结构等）性能的表征。主要研究结果如下：1. (1)通过对KEK-PF-BL3C_1上Fe单晶的X射线磁衍射测量，我们首次获得了PF储存环的垂直束发散角σ_y的精确值，这为其它铁磁材料的测量提供了可能。(2)通过对UTe化合物的测量，得到了由轨道磁矩决定的磁形状因子 关于我们 的铀。此外，我们还首次成功地结合X射线和中子数据分离了铀的轨道和自旋形状因子。2. (1)我们已经成功了。采用<60><20><20>电弧炉直接冷却的新方法，制备了RE_ Fe_ Al_（RE=Gd，Y，Nd，Sm，Tb，Dy，Ho）新型磁性非晶合金。它们的磁性是：除Y合金外为铁磁性，除Gd合金外为硬磁性，在低温下由于交流磁化率的降低，可能是自旋玻璃。(2)在KEK-ARNE 1上进行的α-Gd_Fe_Al_3的磁康普顿散射实验中<60><20><20>，估算了Gd-4f和Fe-3d电子的自旋磁矩（Gd=6.4mu_B，Fe=-2.0mu_B）。(1)3d，4f和5 f元素轨道和自旋形状因子的系统研究。(2)用SPring-8高亮度X射线束对磁性非晶态合金进行X射线磁衍射研究的再尝试。少

The initial aim of this research project, X-ray magnetic diffraction study of magnetic amorphous alloys, has proved to be very difficult because diffraction intensity of amorphous alloys is much weaker than fluorescence one. Then we had the following two new aims and have performed them. 1.Separation of form factors of spin and orbital magnetic moments in ferromagnetic single crystals. 2.Production of new magnetic amorphous alloys of 4f and 3d elements, and characterization of their physical (magnetic, structural, etc) properties. The obtained results are as follows.1. (1) From the X-ray magnetic diffraction measurements of a single crystal Fe at KEK-PF-BL3C_1 we have obtained the precise value of sigma_y (vertical beam divergence) of the PF storage ring for the first time, which has made it possible to make the measurements of other ferromagnetic materials. (2) From the measurements of UTe compound we have obtained the magnetic form factor which is dominated by the orbital magnetic mo … More ment of uranium. Moreover we have succeeded for the first time in separating the orbital and spin form factors of uranium by combining the X-ray and neutron data. 2. (1) We have successfully. produced new magnetic amorphous alloys of RE_<60>Fe_<20>Al_<20> (RE=Gd, Y,Nd, Sm, Tb, Dy, Ho) by a newly developed method of direct cooling in an arc-furnace. Their magnetic properties are : ferromagnetic except for Y alloy, magnetically hard expect for Gd alloy, and might be spin glass at low temperatures as their AC susceptibility decreases. (2) From the magnetic Compton scattering experiment of a-Gd_<60>Fe_<20>Al_<20> at KEK-ARNE1 the spin magnetic moments of Gd-4f and Fe-3d electrons have been estimated (Gd=6.4mu_B, Fe=-2.0mu_B).Future plans concerning the pesent research project are as follow. (1) Systematic study of orbital and spin form factors of 3d, 4f and 5f elements. (2) Trial again to the X-ray magnetic diffraction study of magnetic amorphous alloys using a highly brilliant beam of SPring-8. Less