Publication: Exchange bias and two steps magnetization reversal in porous Co/CoO layer
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2019-06-05
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Elsevier Science
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Abstract
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.
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©2019 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
In memoriam Dr. Patricia Crespo del Arco. This work has been supported by the Spanish Ministry of Science and Innovation (projects MAT2012-37109-C02 and 01; MAT2017-86540-C4-1-R; CTQ2015-65918-R, EU co-financed by FEDER); the CSIC (PIE 201760E002) and H2020-LEIT-NMBP/0248; Regional Government of Madrid through Projects S2013/MIT-2850(NANOFRONTMAG) and P2018/NMT-4321 (NANOMAGCOST). The authors also acknowledge the Laboratory for Nanoscopies and Spectroscopies for the TEMfacilities and the technical assistance of I. Rosa, O. Montes and M.R. Garcia.