Cojocariu I, Jugovac M, Locatelli A, Menteş T O
Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Trieste, Italy.
Dipartimento di Fisica, Università degli studi di Trieste, Via A. Valerio 2, 34127 Trieste, Italy.
J Phys Condens Matter. 2023 Sep 12;35(49). doi: 10.1088/1361-648X/acf0b0.
LM2,3M2,3Auger transition is measured near the Lresonance of ferromagnetic Fe films on W(110). The kinetic energies of the Auger peaks display the typical Raman behaviour for photon energies well below the absorption threshold, where the Auger energy follows the changes in the photon energy. Classical Auger behaviour with constant kinetic energy sets in at about 1.5 eV below the Lresonance independently from the number of Fe layers down to the monolayer thickness. Strong x-ray circular magnetic dichroism is observed at the Ledge in the entire LM2,3M2,3Auger spectrum. Different Auger features originating from the final state with two 3p core holes show slight variations in the dichroic signal, which is attributed to the exchange interaction between the core holes and the valence band. Finally, XMCD-PEEM magnetic domain imaging using Auger electrons is demonstrated with a high level of contrast and lateral resolution approaching that of imaging with secondary photoelectrons.
在W(110)上的铁磁铁薄膜的L共振附近测量了LM2,3M2,3俄歇跃迁。对于远低于吸收阈值的光子能量，俄歇峰的动能呈现出典型的拉曼行为，此时俄歇能量随光子能量的变化而变化。动能恒定的经典俄歇行为在低于L共振约1.5 eV时出现，与铁层数量无关，直至单层厚度。在整个LM2,3M2,3俄歇光谱的L边缘观察到强烈的x射线圆磁二色性。源自具有两个3p芯孔的终态的不同俄歇特征在二色性信号中显示出轻微变化，这归因于芯孔与价带之间的交换相互作用。最后，展示了使用俄歇电子的XMCD-PEEM磁畴成像，其具有高对比度和接近二次光电子成像的横向分辨率。
