Exchange bias and two steps magnetization reversal in porous Co/CoO layer
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Author/sOvejero, Jesús G.; Godinho, Vanda; Lacroix, Bertrand; García, Miguel A.; Hernando, Antonio; Fernández, Asunción
DepartmentCiencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
SourceMaterials and Design 171 (2019) 107691
In this paper Co/CoO thick layers (hundreds of nanometers) of different porosity and oxidation degree were prepared in a magnetron sputtering deposition process by tailoring the DC sputtering power, as well as the process gas and target composition. The control of the synthesis parameters allowed the nanostructuration of the films with a singular distribution of closed pores and a controlled amount of CoO. We observed an exchange bias field of 2.8 KOe for porous Co/CoO composites, similar to Co/CoO bilayers but for coatings thicker than 300 nm. Besides, it was observed that the coating presents bistable magnetic features when cooled under zero field conditions as a result of the unusual exchange coupling.