000161786 001__ 161786
000161786 005__ 20251017144625.0
000161786 0247_ $$2doi$$a10.1016/j.jallcom.2025.181326
000161786 0248_ $$2sideral$$a144457
000161786 037__ $$aART-2025-144457
000161786 041__ $$aeng
000161786 100__ $$0(orcid)0000-0002-2642-5635$$aBegué, Adrián
000161786 245__ $$aEnhanced magnetoelastic stress in disordered iron–gallium alloy thin films revealed by direct measurement
000161786 260__ $$c2025
000161786 5060_ $$aAccess copy available to the general public$$fUnrestricted
000161786 5203_ $$aThe large magnetostriction in FeGa alloys is relevant for manifold applications, but for thin films, it can play a prominent role in controlling the strength of the magnetic anisotropy. Bulk samples show values depending on the extensive preparation procedure compendium, which is limited in its temperature range for high-quality thin-film synthesis. Here, we present a study of the magnetoelastic coupling coefficients and in epitaxial FeGa thin films below 50 nm deposited on the MgO(001) surface at 150 °C by the cantilever method. Series of films with 22, 28, and 33 at. % Ga do not show thickness-dependent variations for and , but for the 22 at. % Ga composition is 10 MPa, roughly 2 times the bulk value and smaller than the bulk-like value of =12.1 MPa obtained for a film with 17 at. % Ga. This enhancement is correlated with the A2 crystal structure for the film rather than the coexistence with D0 or other ordered nanometric precipitates proposed for bulk samples. Synchrotron diffraction excludes the formation of long-range L6, or D0 precipitates in samples with (001)A2 peaks at concentrations around 25 at. % Ga, which implies partial chemical disorder. The analysis of extended x-ray absorption fine structure measurements points to a D0 local order with a residual number of Ga–Ga pairs. Considering that the substrate quenches the movable strain in the A2 phase described in dual-phase structures, our results point to the important role of the electronic structure of the iron atoms modified by the presence of Ga in the alloy. This effect enlarges in films with the A2 phase, stabilized using epitaxial growth.
000161786 536__ $$9info:eu-repo/grantAgreement/EUR/MICINN/TED2021-131064B-I00$$9info:eu-repo/grantAgreement/ES/MICINN/PID2021-124734OB-C21
000161786 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000161786 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000161786 700__ $$0(orcid)0000-0003-4079-2658$$aProietti, Maria Grazia$$uUniversidad de Zaragoza
000161786 700__ $$0(orcid)0000-0002-2624-6004$$aArnaudas, José Ignacio$$uUniversidad de Zaragoza
000161786 700__ $$0(orcid)0000-0003-1930-1455$$aCiria, Miguel
000161786 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000161786 773__ $$g1036 (2025), 181326 [9 pp.]$$pJ. alloys compd.$$tJOURNAL OF ALLOYS AND COMPOUNDS$$x0925-8388
000161786 8564_ $$s2485879$$uhttps://zaguan.unizar.es/record/161786/files/texto_completo.pdf$$yVersión publicada
000161786 8564_ $$s2712524$$uhttps://zaguan.unizar.es/record/161786/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000161786 909CO $$ooai:zaguan.unizar.es:161786$$particulos$$pdriver
000161786 951__ $$a2025-10-17-14:23:43
000161786 980__ $$aARTICLE