Unravelling the effect of SrTiO3 antiferrodistortive phase transition on the magnetic properties of La0.7Sr0.3MnO3 thin films

• Tipo: Artigo em Revista Científica Internacional
• Data: 2014

Autores

Mota, DA (Autor) Outra; Romaguera Barcelay, YR (Autor) Outra; Senos, AMR (Autor) Outra; Fernandes, CM (Autor) Outra; Tavares, PB (Autor) Outra; Gomes, IT (Autor) Outra; Sa, P (Autor) Outra; Fernandes, L (Autor) Outra; Almeida, BG (Autor) Outra; Figueiras, F (Autor) Outra; Mirzadeh Vaghefi, PM (Autor) Outra; Amaral, VS (Autor) Outra; Almeida, A (Autor) Outra; Perez de la Cruz, JP (Autor) Outra; Agostinho Moreira, JA (Autor) FCUP

Revista

Título: Journal of Physics D: Applied Physics

Vol. 47

Página Final: 435002

ISSN: 0022-3727

Editora: Institute of Physics Publishing

Indexação

ISI Proceedings

ISI Web of Knowledge - 6 Citações

Scopus - 6 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Física

Outras Informações

ID Authenticus: P-009-VMG

DOI: 10.1088/0022-3727/47/43/435002

Abstract (EN): Epitaxial La0.7Sr0.3MnO3 (LSMO) thin films, with different thicknesses ranging from 20 to 330 nm, were deposited on (1 0 0)-oriented strontium titanate (STO) substrates by pulsed laser deposition, with their structure and morphology characterized at room temperature. The magnetic and electric transport properties of the as-processed thin films reveal an abnormal behaviour in the temperature dependent magnetization M(T) below the antiferrodistortive STO phase transition (T-STO), and also an anomaly in the magnetoresistance and electrical resistivity close to the same temperature. Films with thickness <= 100 nm show an in-excess magnetization and pronounced changes in the coercivity due to the interface-mediated magnetoelastic coupling with antiferrodistortive domain wall movement occurring below T-STO. However, in thicker LSMO thin films, an in-defect magnetization is observed. This reversed behaviour can be understood with the emergence in the upper layer of the film, of a columnar structure needed to relax the elastic energy stored in the film, which leads to randomly oriented magnetic domain reconstructions. For enough high-applied magnetic fields, as thermodynamic equilibrium is reached, a full suppression of the anomalous magnetization occurs, wherein the temperature dependence of the magnetization starts to follow the expected Brillouin behaviour.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9