Competition between CoOx and CoPt phases in Pt/Co/AlOx semi tunnel junctions | Zendy

H. Garad | Zendy; L. Ortéga | Zendy; Aline Y. Ramos | Zendy; Yves Joly | Zendy; F. Fettar | Zendy; S. Auffret | Zendy; B. Rodmacq | Zendy; B. Diény | Zendy; Olivier Proux | Zendy; A. Erko | Zendy

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Competition between CoOx and CoPt phases in Pt/Co/AlOx semi tunnel junctions

Author(s) -

H. Garad,

L. Ortéga,

Aline Y. Ramos,

Yves Joly,

F. Fettar,

S. Auffret,

B. Rodmacq,

B. Diény,

Olivier Proux,

A. Erko

Publication year - 2013

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.4816620

Subject(s) - annealing (glass) , materials science , alloy , surface finish , crystallography , condensed matter physics , analytical chemistry (journal) , chemical physics , metallurgy , chemistry , physics , chromatography

10 pagesInternational audienceWe report on the evolution of the structure and composition of a Pt(3 nm)/Co(0.6 nm)/AlOx(2 nm) trilayer sputtered on Si/SiO2 under oxidation and annealing processes by combined x-ray reflectivity and x-ray absorption studies. We describe the progressive and inhomogeneous oxidation of the layers by increasing the oxidation time. Before annealing, the layers have lower density than bulk samples and noticeable roughness. After thermal annealing, a significant improvement of the quality of the alumina layer goes along with the formation of a CoPt alloy that reduces the number of Co-O bonds. These structural outcomes clarify the evolution of the magnetic and transport properties reported at room temperature in these samples

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