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Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by thermal annealing


The magnetization dynamics in ZnO:Ag/NiFe heterostructures has been investigated through magnetoimpedance measurements. By annealing the ZnO:Ag layer during the production process of the samples, structural and magnetic features of the whole heterostructure are modified, showing that the dynamical magnetic response of the heterostructure is strongly dependent on the annealing temperature. The magnetoimpedance results are discussed in terms of the different mechanisms governing the magnetization dynamics at distinct frequency ranges and in terms of the evolution of the ZnO:Ag layer with annealing. The presented results open new roads for technological application of semiconductor/ferromagnetic heterostructures.

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This work was partially supported by the Brazilian agencies CNPq and CAPES. Further, this work was also supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding UID/FIS/04650/2019 and project PTDC/BTM-MAT/28237/2017. A. Ferreira acknowledges the FCT for the Junior Research Contract. Financial support from the Basque Government Industry Department under the ELKARTEK, HAZITEK, and PIBA programs is also acknowledged.

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Correspondence to M. A. Correa.

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Ferreira, A., Correa, M.A., Lanceros-Méndez, S. et al. Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by thermal annealing. J Mater Sci 55, 5961–5968 (2020).

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