Abstract
Thick (1-14 μm) films of ferrimagnetic barium hexaferrite (BaFe₁₂O₁₉ or BaM) having the c-axis ([0001]) in the film plane were deposited by pulsed laser deposition onto a-plane (1120) sapphire (Al₂O₃) substrates, and were found to have a (1010) orientation. Torque and magnetization measurements show these films are permanent magnets with easy magnetization direction in the plane of the film. Ferrimagnetic resonance (FMR) spectra exhibited linewidths of 1.00-1.40 kOe, where low-field FMR measurements do not show uniform mode broadening due to the formation of multiple domains. All film parameters were affected by the large stress present in these films due to crystallographic and thermal mismatches. These films have dual functionality as gyrotropic media and permanent magnets, and are usable as either nonreciprocal microwave devices or biasing magnets.
Keywords
ferrimagnetic barium hexaferrite, microwave properties, c axis, magnet films, BaFe₁₂O₁₉, BaM, Ferrimagnetic resonance, FMR
Subject Categories
Thick films, Magnetic properties, Permanent magnets, Pulsed laser deposition, Magnetization
Disciplines
Electromagnetics and photonics
Publisher
American Institute of Physics
Publication Date
4-1-2003
Rights Information
Copyright 2003 American Institute of Physics.
Rights Holder
American Institute of Physics
Permanent URL
Recommended Citation
Yoon, S. D.; Vittoria, C.; and Oliver, S. A., "Magnetic and microwave magnetic properties of barium hexaferrite permanent magnet films having the c-axis in the film plane" (2003). Electrical and Computer Engineering Faculty Publications. Paper 69. http://hdl.handle.net/2047/d20002240
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Notes
Originally published in Journal of Applied Physics 93, 4023 (2003). DOI:10.1063/1.1544083 (http://dx.doi.org/10.1063/1.1544083).