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oai:docta.ucm.es:20.500.14352/84182023-08-27T07:16:48Zcom_20.500.14352_14col_20.500.14352_15

Interfacial coupling effect of Cr_2O_3 on the magnetic properties of Fe_72Ga_28 thin films Hontecillas, I. Maicas, M. Andrés, J.P. Ranchal Sánchez, Rocío 538.9 Random-field model Exchange bias Fe-Ga Anisotropy Surface Física de materiales Física del estado sólido 2211 Física del Estado Sólido ©2021 The Author(s) CAI Difraccion Rayos-X from UCM is acknowledged for XRD measurements. This work has been financially supported through the projects RTI2018-097895-B-C43 of the Spanish Ministry of Science, Innovation, and Universities, MAT2017-87072-C4-3-P of the Spanish Ministry of Economy, Industry and Competitiveness, and 'Plan Propio de la Universidad de Castilla - La Mancha' (FEDER, EU) for the 'Grupo de Materiales Magneticos (GMM)'. The data that support the findings of this study are available from the corresponding author upon reasonable request. Here it is investigated the effect of the antiferromagnet Cr_2O_3 on the magnetic properties of ferromagnetic Fe_72Ga_28 thin films. Sputtered Fe_72Ga_28 layers have their magnetization in the sample plane with a magnetic fluctuation that gives rise to magnetic ripple. In order to turn its magnetization into the out of plane (OOP) direction, it has been magnetically coupled with Cr_2O_3 that has magnetic moments along the c-axis, that is the perpendicular direction when properly aligned. Cr2O3 has been obtained from Cr oxidation, whereas Fe_72Ga_28 has been deposited on top of it by sputtering in the ballistic regime. Although a uniaxial in-plane magnetic anisotropy is expected for Fe_72Ga_28 thickness above 100 nm, the interfacial coupling with Cr2O3 prevents this anisotropy. The formation of stripe domains in Fe_72Ga_28 above a critical thickness reveals the enhancement of the out of plane component of the Fe_72Ga_28 magnetization with respect to uncoupled layers. Due to the interface coupling, the Fe72Ga28 magnetization turns into the out-of-plane direction as its thickness is gradually reduced, and a perpendicular magnetic anisotropy of 3.10^6 erg.cm^(-3) is inferred from experimental results. Eventually, the coupling between Cr_2O_3 and Fe_72Ga_28 promotes an exchange-bias effect that has been well fitted by means of the random field model. Ministerio de Ciencia e Innovación (MICINN) Ministerio de Economía y Competitividad (MINECO) Depto. de Física de Materiales Fac. de Ciencias Físicas TRUE pub 2023-06-17T09:13:12Z 2023-06-17T09:13:12Z 2021-06-28 journal article https://hdl.handle.net/20.500.14352/8418 2045-2322 10.1038/s41598-021-92640-y eng RTI2018-097895-B-C43 MAT2017-87072-C4-3-P Atribución 3.0 España https://creativecommons.org/licenses/by/3.0/es/ open access application/pdf Nature publishing group