Microstructural and magnetic characterization of Fe- and Ir-based multilayers

Arias-Egido, E. ; Laguna-Marco, M.A. (Universidad de Zaragoza) ; Sanchez-Marcos, J. ; Piquer, C. (Universidad de Zaragoza) ; Chaboy, J. (Universidad de Zaragoza) ; Avila, M. ; Lopez, J.G.

Resumen: Nominal [Fe(t)/Ir(t'')](n) (M/Mtype), [FeOx(t)/IrOx(t'')](n) (O/O), and [Fe(t)/IrOx(t'')](n) (M/O) multilayers have been prepared by magnetron sputtering at room temperature. Composition, structure, and magnetic behavior have been analyzed. In the M/M samples, the Fe and Ir phases are identified as bcc and fcc, respectively. The magnetism evolves from bulklike iron to granular behavior as the thickness of the Fe layers decreases. An induced magnetic moment, ferromagnetically coupled to Fe, is observed on Ir by x-ray magnetic circular dichroism (XMCD). Besides, the presence of negative remanent magnetization is observed in the M/M samples. As for the M/O samples, the stronger affinity of iron for oxygen displaces the oxygen atoms giving rise to actual heterostructures that strongly differ from the nominal ones. For similar thickness of the two layers the Fe layer become oxidized while a mixture of metal and oxide phases is found in the Ir layer. The increase of the Fe thickness leads to a metallic Ir layer and a highly coercive (similar to 4.4 kOe) core-shell metal-oxide structure in the Fe layers.

Idioma: Inglés

DOI: 10.1103/PhysRevMaterials.2.014402

Año: 2018

Publicado en: Physical Review Materials 2, 1 (2018), 014402 [10 pp]
ISSN: 2475-9953

Factor impacto JCR: 2.926 (2018)

Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 105 / 293 = 0.358 (2018) - Q2 - T2

Financiación: info:eu-repo/grantAgreement/ES/DGA/NETOSHIMA
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-54425-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2017-83468-R

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)