FMR and Magnetic Studies of RF-Sputtered Mn-Zn Ferrite Thin Films
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The Manganese–Zinc ferrite (MZF) thin films were deposited on quartz substrates by radio frequency (RF) magnetron sputtering at 10 mTorr of argon gas pressure. The FMR and magnetization measurement were carried out to understand magnetic properties of the as-deposited and annealed MZF films. The resonance field (Hr) of the FMR spectra shifts towards higher magnetic field when angle between applied field and thin film plane is changed from 0 to 90° indicating the existence of uniaxial anisotropy in the film. Whereas, Hr shifts towards lower magnetic field with decrease in temperature of the film. This is due to ferrimagnetic ordering in the films at low temperatures. The magnetization versus field (M-H) plots reveal the soft ferrimagnetic behavior of the films. The post-deposition annealing of the film leads to increase in crystallite size with more uniform film surface and dense columnar growth compared to the as-deposited film. The increase in magnetization and decreases in Hr-values compared to that of as-deposited film are observed for annealed film. The optical band gap of the film is also found to increase with annealing.
KeywordsMagnetic anisotropy Uniaxial anisotropy Sputtering Ferromagnetic resonance Resonance field Crystallinity
Atiya Farheen is grateful for INSPIRE fellowship from the Department of Science and Technology (DST), India.
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