Abstract

This work examines the material characteristics and magnetic properties of hexagonal M-type barium ferrite (BaFe₁₂O₁₉) films deposited by pulsed laser ablation deposition onto (111) magnesium oxide substrates at different oxygen growth pressures. X-ray diffraction data showed the lattice constant of the film grown at 300 mTorr c=23.23 Å increased to c=23.30 Å for the film grown at 20 mTorr. The saturation magnetization ranged from 4.03 to 4.33 kG and the magnetic uniaxial anisotropy field ranged from 16.73 to 19.49 kOe as the oxygen pressure was varied from 10 to 300 mTorr. The narrowest ferrimagnetic resonance (FMR) linewidths (ΔH) for as-produced films were obtained for the 10 mTorr films, where ΔH=0.39 kOe. Films grown with oxygen pressure at 200 mTorr or higher showed two distinct resonance modes, which exhibited ΔH1≥0.90 kOe and ΔH2≥1.10 kOe at 59 GHz for a film deposited at 925°C. The FMR linewidths for this film decreased to ΔH1=0.52 kOe and ΔH2=0.45 kOe after annealing the film at 1000°C for 1 h. These results indicate that thick films grown at higher oxygen pressures have magnetic parameters closer to bulk values, but also show larger magnetic losses than films grown at lower oxygen pressures.

Notes

Originally published in Journal of Applied Physics 92, 6733 (2002). DOI:10.1063/1.1521525 (http://dx.doi.org/10.1063/1.1521525).

Keywords

barium hexaferrite films, hexagonal M-type barium films, oxygen pressure, material parameters variation, BaFe₁₂O₁₉

Subject Categories

Barium films (Metal coating), Magnesium oxide

Disciplines

Electromagnetics and photonics

Publisher

American Institute of Physics

Publication Date

12-1-2002

Rights Information

Copyright 2002 American Institute of Physics.

Rights Holder

American Institute of Physics


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