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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/229952
Magnetic x-ray spectroscopy of Gd-doped EuO thin films
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We present a detailed x-ray magnetic circular dichroism (XMCD) study of the magnetic properties of Gd-doped EuO thin films, synthesized via molecular-beam epitaxy with Gd doping levels up to over 12%. The impact of Gd doping on the electronic and magnetic behavior of EuO is studied using XMCD and magnetometry. Gd doping significantly enhances the Curie temperature ( C) from 69 K in undoped EuO to over 120 K, driven by increased carrier density, while preserving the high quality of the single-crystalline films. At higher doping levels, a plateau in C is observed, which is attributed to the formation of Eu-Gd nearest-neighbor pairs that limit dopant activation. We also observe a distinctive “double-dome” structure in the temperature-dependent magnetization, which we attribute to both the ferromagnetic ordering of Eu 4 moments at lower temperatures and the influence of conduction electrons via 4 −5 exchange interactions at higher temperatures. These findings provide key insights into the mechanisms of carrier-induced magnetic transitions.
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ARNOLD, Ethan, et al. Magnetic x-ray spectroscopy of Gd-doped EuO thin films. Physical Review Materials. 2025. Vol. 9, num. 024410, pags. 024410-1-024410-7. ISSN 2475-9953. [consulted: 22 of August of 2026]. Available at: https://hdl.handle.net/2445/229952