2026-06-27T16:04:33Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1322822026-02-13T01:19:55Zcom_20.500.14352_14col_20.500.14352_15

González García, Álvaro Álvarez Chico, Alejandro Obando Guevara, Jairo Gallego, Silvia Atxitia, Unai Cojocariu, Iulia Jugovac, Matteo Menteş, Tevfik Onur Locatelli, Andrea Mascaraque Susunaga, Arantzazu González Barrio, Miguel Ángel 2026-02-12T19:32:41Z 2026-02-12T19:32:41Z 2026-01-09 González‐García, Á., Álvarez‐Chico, A., Obando‐Guevara, J., Gallego, S., Atxitia, U., Cojocariu, I., ... & González‐Barrio, M. Á. (2026). Interplay Between Structure and Interfacial Interactions in Fe‐Gd Synthetic Ferrimagnets. Advanced Electronic Materials, e00686. 10.1002/aelm.202500686 https://hdl.handle.net/20.500.14352/132282 2199-160X https://doi.org/10.1002/aelm.202500686 https://advanced.onlinelibrary.wiley.com/doi/10.1002/aelm.202500686 Transition metal–rare earth compounds are promising synthetic ferrimagnets for next-generation spintronic devices, where magnetic domain structure and thermal evolution are key to performance. We studied ultrathin Fe–Gd ferrimagnets grown epitaxially on W(110) by atomic layer deposition, combining element-resolved magnetic microscopy with structural characterization. Comparing Gd/Fe and Fe/Gd bilayers with homogeneous Fe1 − xGdx alloys, we find that Curie temperature (Tc) and domain behavior are governed primarily by crystallinity and interfacial coupling. In crystalline Gd/Fe, the Gd layer remains ferromagnetic up to ∼500 K, far above its bulk Tc, due to strong interfacial coupling. In contrast, poor crystallinity of the Fe layer in Fe/Gd suppresses Fe magnetic order, yielding a reduced common Tc of ∼325 K, similar to the homogeneous alloy (Tc ∼ 345 K). Atomistic spin simulations capture these trends and isolate the role of disorder. Together, these results demonstrate how structural control can be used to tune Curie and compensation temperatures in ultrathin ferrimagnetic heterostructures for ultrafast, energy-efficient spintronic applications. eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 International Interplay between structure and interfacial interactions in Fe‐Gd synthetic ferrimagnets journal article