Usachov Dmitry Yu, Glazkova Daria, Tarasov Artem V, Schulz Susanne, Poelchen Georg, Bokai Kirill A, Vilkov Oleg Yu, Dudin Pavel, Kummer Kurt, Kliemt Kristin, Krellner Cornelius, Vyalikh Denis V
St. Petersburg State University, 7/9 Universitetskaya nab, St. Petersburg 199034, Russia.
Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01062 Dresden, Germany.
J Phys Chem Lett. 2022 Aug 25;13(33):7861-7869. doi: 10.1021/acs.jpclett.2c02203. Epub 2022 Aug 17.
To use efficiently the magnetic functionalities emerging at the surfaces or interfaces of novel lanthanides-based materials, there is a need for complementary methods to probe the atomic-layer resolved magnetic properties. Here, we show that 4f photoelectron spectroscopy is highly sensitive to the collective orientation of 4f magnetic moments and, thus, a powerful tool for characterizing the related properties. To demonstrate this, we present the results of systematic study of a family of layered crystalline 4f-materials, which are crystallized in the body-centered tetragonal ThCrSi structure. Analysis of 4f spectra indicates that the 4f moments at the surface experience a strong reorientation with respect to the bulk, caused by changes of the crystal-electric field. The presented database of the computed 4f spectra for all trivalent rare-earth ions in their different states will facilitate the estimation of the orientation of the 4f magnetic moments in the layered 4f-systems for efficient control of their magnetic properties.
为了有效利用新型镧系元素基材料表面或界面出现的磁功能，需要采用互补方法来探测原子层分辨的磁性能。在此，我们表明4f光电子能谱对4f磁矩的集体取向高度敏感，因此是表征相关特性的有力工具。为证明这一点，我们展示了对一族层状晶体4f材料的系统研究结果，这些材料以体心四方ThCrSi结构结晶。对4f光谱的分析表明，由于晶体电场的变化，表面的4f磁矩相对于体相经历了强烈的重新取向。所呈现的所有三价稀土离子不同状态下计算得到的4f光谱数据库，将有助于估计层状4f系统中4f磁矩的取向，以便有效控制其磁性能。
