Structural, optical and magnetic properties of pulsed laser deposited Co-doped ZnO films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

Karzazi, O (Autor) Outra; Sekhar, KC (Autor) Outra; El Amiri, A (Autor) Outra; Hlil, EK (Autor) Outra; Conde, O (Autor) Outra; Levichev, S (Autor) Outra; Agostinho Moreira, JA (Autor) FCUP; Chahboun, A (Autor) Outra; Almeida, A (Autor) FCUP; Gomes, MJM (Autor) Outra

Revista

Título: Journal of Magnetism and Magnetic Materials

Vol. 395

Páginas: 28-33

ISSN: 0304-8853

Editora: Elsevier

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 13 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-00G-E5C

DOI: 10.1016/j.jmmm.2015.07.030

Abstract (EN): Zn1-xCoxO films with different Co concentrations (with x=0.00, 0.10, 0.15, and 0.30) were grown by pulsed laser deposition (PLD) technique. The structural and optical properties of the films were investigated by grazing incidence X-ray diffraction (GIXRD), Raman spectroscopy and photoluminescence (PL). The magnetic properties were measured by conventional magnetometry using a SQUID and simulated by ab-initio calculations using Korring-Khon-Rostoker (KKR) method combined with coherent potential approximation (CPA). The effect of Co-doping on the GIXRD and Raman peaks positions, shape and intensity is discussed. PL studies demonstrate that Co-doping induces a decrease of the bandgap energy and quenching of the UV emission. They also suggest the presence of Zn interstitials when x >= 0.15. The 10% Co-doped ZnO film shows ferromagnetism at 390 K with a spontaneous magnetic moment approximate to 4 x 10(-5) emu and coercive field approximate to 0.17 kOe. The origin of ferromagnetism is explained based on the calculations using KKR method.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6