Exchange bias and two steps magnetization reversal in porous Co/CoO layer

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URI: http://hdl.handle.net/10498/21206
DOI: 10.1016/j.matdes.2019.107691
ISSN: 0264-1275
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2019-06Department
Ciencia de los Materiales e Ingeniería Metalúrgica y Química InorgánicaSource
Materials and Design 171 (2019) 107691Abstract
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.
Subjects
Co; Porous; Double loop; Exchange biasCollections
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