On the nature of the room temperature ferromagnetism in nanoparticulate co-doped ZnO thin films prepared by EB-PVD

Author(s)

Mamani, Niko Churata ; da Silva, Rafael Tomaz ; de Zevallos, Angela Ortiz ; Chaves Cotta, Alexandre Alberto ; de Almeida Macedo, Waldemar Augusto ; Li, Maximo Siu ; Basso Bernardi, Maria Ines ; Doriguetto, Antonio Carlos ; de Carvalho, Hugo Bonette

• Document type: Journal article
• Source: Journal of Alloys and Compounds; v. 695, p. 2682-2688, FEB 25 2017.
• Web of Science Citations: 7

Abstract

The complete comprehension of the magnetic properties of the dilute magnetic oxides has emerged as one of the major challenges in the fields of materials science and condensed matter physics. Up to now, there is no consensus about the mechanism behind the so often observed room temperature ferromagnetism. However it is well known that defects plays an important role in the context. Here we present the study of the correlation between the structural and the magnetic properties of nanoparticulate Co-doped ZnO (Zn1-xCoxO, x = 0.02 and 0.08) thin films prepared via Electron Beam-Physical Vapor Deposition. The structural results confirms the incorporation of the Co2+ ions into the ZnO host matrix with no secondary phases. Magnetic measurements show a robust ferromagnetic order for the thin film with x = 0.08, whereas for the sample with x = 0.02 only a tiny ferromagnetism were observed. We could explain the differences in the magnetic behavior entirely under the scope of the spin-split impurity band model. In this work we also present convincing evidences of the no correlation between the oxygen vacancies and the desired room temperature ferromagnetism. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/07909-4 - Preparation and characterization of magnetic oxides films nanostructured
• Grantee: Maria Inês Basso Bernardi
• Support type: Regular Research Grants