St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034, Russia.
Moscow Institute of Physics and Technology, Institute Lane 9, Dolgoprudny, 141701, Russia.
J Phys Chem Lett. 2023 Jun 22;14(24):5537-5545. doi: 10.1021/acs.jpclett.3c01276. Epub 2023 Jun 9.
The orientation of the 4f moments offers an additional degree of freedom for engineering the spin-related properties in spintronic nanostructures of lanthanides. Yet, precise monitoring of the direction of magnetic moments remains a challenge. Here, on the example of the antiferromagnets HoRhSi and DyRhSi, we investigate the temperature-dependent canting of the 4f moments near the surface. We demonstrate that this canting can be understood in the framework of crystal electric field theory and the exchange magnetic interaction. Using photoelectron spectroscopy, we disclose subtle but certain temperature-dependent changes in the line shape of the 4f multiplet. These changes are directly linked to the canting of the 4f moments, which is different for the individual lanthanide layers near the surface. Our results illustrate the opportunity to monitor the orientation of the 4f-moments with high precision, which is essential for development of novel lanthanide-based nanostructures, interfaces, supramolecular complexes, and single-molecule magnets for various applications.
4f 磁矩的取向为在镧系元素的自旋电子纳米结构中工程化自旋相关性质提供了额外的自由度。然而，精确监测磁矩的方向仍然是一个挑战。在这里，我们以反铁磁体 HoRhSi 和 DyRhSi 为例，研究了表面附近 4f 磁矩的温度相关倾斜。我们证明，这种倾斜可以用晶体电场理论和交换磁相互作用来理解。使用光电子能谱，我们揭示了 4f 多重态线形状的微妙但确定的温度依赖性变化。这些变化与 4f 磁矩的倾斜直接相关，对于表面附近的各个镧系元素层，这种倾斜是不同的。我们的结果说明了以高精度监测 4f 磁矩取向的机会，这对于开发新型基于镧系元素的纳米结构、界面、超分子复合物和用于各种应用的单分子磁体至关重要。
