Title :
Mechanism of the Tensile-Strain Effect in La0.67Ca0.33MnO3 and La0.8Ba0.2MnO3 Thin Films
Author :
Yuan, F. ; Hsu, S. ; Wu, C. ; Lin, Chong ; Chou, H. ; Lin, Chong
Author_Institution :
Nat. Sun Yat-Sen Univ., Kaohsiung
Abstract :
In this study, we employ X-ray absorption near edge structure (XANES) of the La0.67Ca0.33MnO3 and La0.8Ba0.2MnO3 films with various thicknesses to understand the mechanism of the tensile-strain effect. The ferromagnetic-paramagnetic and the metal-insulator transition temperatures of the colossal magnetoresistance (CMR) thin film can be changed by the tensile-strain effect due to a lattice mismatch between the thin film and substrate. The XANES measurements reveal the details of the coupling between cations and anions. The opposite tendency of peaks intensity for thin and thick LCMO and LBMO films suggests that the mechanism of the tensile strain rely on both O-La and O-Mn couplings.
Keywords :
XANES; barium compounds; calcium compounds; colossal magnetoresistance; ferromagnetic-paramagnetic transitions; lanthanum compounds; magnetic thin films; metal-insulator transition; tensile strength; La0.67Ca0.33MnO3; La0.8Ba0.2MnO3; X-ray absorption near edge structure; XANES; colossal magnetoresistance; ferromagnetic-paramagnetic transition; lattice mismatch; metal-insulator transition; tensile-strain effect; thin films; Annealing; Colossal magnetoresistance; Electromagnetic wave absorption; Electrons; Metal-insulator structures; Physics; Sputtering; Substrates; Temperature; Transistors;
Conference_Titel :
Magnetics Conference, 2006. INTERMAG 2006. IEEE International
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-1479-2
DOI :
10.1109/INTMAG.2006.376096
