The Structural and Optical Properties of Nanocrystalline Fe3O4 Thin Films Prepared by PLD

Abdulkareem, Khalid A.; Kadhim, Suad; Ali, Shams B.

doi:10.30684/etj.v40i2.2235

	The Structural and Optical Properties of Nanocrystalline Fe3O4 Thin Films Prepared by PLD
Engineering and Technology Journal
Article 5, Volume 40, Issue 2, 2022, Pages 334-342 PDF (1.13 M)
Document Type: Research Paper
DOI: 10.30684/etj.v40i2.2235
Authors
Khalid A. Abdulkareem¹; Suad Kadhim^* ²; Shams B. Ali³
¹Laser and Optoelectronics Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
²University of technology/ department of Laser and Optoelectronics Engineering
³Laser and Optoelectronics Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq
Abstract
In this study, thin films of pure iron oxide (Fe3O4) were prepared using pulsed laser deposition technique under vacuum (2×10-3 mbar) using Nd: YAG laser at different laser energies (700, 800, 900, and 1000 mJ) on quartz slides at the substrate temperature of 200 °C with different thickness (170,190, 220, and 250 nm). The prepared thin films were examined using different techniques. The Xray diffraction showed a polycrystalline structure of cubic Fe3O4 phase, enhanced its crystallinity, and increased the crystalline size when increasing the laser energy to 1000 mJ. The results revealed that high transparency samples decreased pulse laser energy. As the laser pulse power increases, the transparency decreases from 91% to 61%, where optical properties deteriorate significantly. The bandgap values were detected to be 3.9 eV, 3.75 eV, 3.21 eV, and 3 eV when the laser energies were increased with thickness (170– 250) nm. In addition, the extinction coefficient, dielectric constants, optical constants, and refractive constants were studied
Highlights
The XRD results indicated that Fe3O4 had acubic spinel structure because of the strongest reflection from 311 planes. Increasing the pulse laser energy reduces the energy gap of films. energy gap of films. When the pulses laser energy increases,the absorption and the film''s thickness increathe absorption and the film''sthickness increase
Keywords
X-Ray Diffraction (XRD); Fe3O4; Iron oxide; Magnetite; Optical properties; Pulsed laser deposition

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