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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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Articles publicats en revistes (Física de la Matèria Condensada)

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Magnetic x-ray spectroscopy of Gd-doped EuO thin films