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Open AccessArticle

Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture

1
Departamento de Física, Universidade Federal do Rio Grande do Norte, 59078-900 Natal, RN, Brazil
2
Centro de Física, Universidade do Minho, 4710-057 Braga, Portugal
3
IKERBASQUE, Basque Foundation for Science, E-48013 Bilbao, Spain
4
BCMaterials, Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, 48940 Leioa, Spain
*
Author to whom correspondence should be addressed.
Materials 2020, 13(13), 2907; https://doi.org/10.3390/ma13132907
Received: 8 May 2020 / Revised: 9 June 2020 / Accepted: 11 June 2020 / Published: 29 June 2020
Multifunctional and multiresponsive thin films are playing an increasing role in modern technology. This work reports a study on the magnetic properties of ZnO and Ag-doped ZnO semiconducting films prepared with a zigzag-like columnar architecture and their correlation with the processing conditions. The films were grown through Glancing Angle Deposition (GLAD) co-sputtering technique to improve the induced ferromagnetism at room temperature. Structural and morphological characterizations have been performed and correlated with the paramagnetic resonance measurements, which demonstrate the existence of vacancies in both as-cast and annealed films. The magnetic measurements reveal changes in the magnetic order of both ZnO and Ag-doped ZnO films with increasing temperature, showing an evolution from a paramagnetic (at low temperature) to a diamagnetic behavior (at room temperature). Further, the room temperature magnetic properties indicate a ferromagnetic order even for the un-doped ZnO film. The results open new perspectives for the development of multifunctional ZnO semiconductors, the GLAD co-sputtering technique enables the control of the magnetic response, even in the un-doped semiconductor materials. View Full-Text
Keywords: zinc oxide; thin films; room temperature ferromagnetism; doping; silver; sputtering zinc oxide; thin films; room temperature ferromagnetism; doping; silver; sputtering
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MDPI and ACS Style

G. S. Santos, J.; Correa, M.A.; Ferreira, A.; R. Carvalho, B.; B. da Silva, R.; Bohn, F.; Lanceiros-Méndez, S.; Vaz, F. Magnetic Response Dependence of ZnO Based Thin Films on Ag Doping and Processing Architecture. Materials 2020, 13, 2907.

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