Journal of Applied Physics · 1996 · 51 citations · 2 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsThin FilmsFerromagnetismMagnetic CharacterizationMagnetic OxidesMagnetic Properties Of SolidsMagnetism In SolidsThin Film Magnetic PropertiesFerromagnetic ResonanceIntrinsic PropertiesMagnetic Field InhomogeneityMagnetic Materials CharacterizationMagnetization In Thin FilmsManganitesTemperature-dependent MagnetizationThin Film Magnetism
Systematic magnetization and ferromagnetic resonance (FMR) measurements have been performed on thin-film samples of La0.67Ba0.33MnOz (TC∼340 K). It is found from the FMR data that as- grown films show broad lines whose width Γ increases to nearly 1 kOe as T reduced to 77 K. The increase roughly follows the increase in the magnetization suggesting magnetic inhomogeneity as the main cause for the rise in Γ. However, when films were properly annealed in O2, we obtained narrow lines (Γ∼200 Oe at 10 GHz). Γ was effectively independent of temperature and linearly dependent upon microwave frequency, both of which are strong signs that, we have succeeded in obtaining a uniform, homogeneous manganite sample. Having gotten a uniform material, we have measured the intrinsic properties of this system.
2