Open Access. Powered by Scholars. Published by Universities.®
Electromagnetics and Photonics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Electromagnetics and Photonics
Magnetic And Microwave Magnetic Properties Of Barium Hexaferrite Permanent Magnet Films Having The C-Axis In The Film Plane, S. D. Yoon, C. Vittoria, S. A. Oliver
Magnetic And Microwave Magnetic Properties Of Barium Hexaferrite Permanent Magnet Films Having The C-Axis In The Film Plane, S. D. Yoon, C. Vittoria, S. A. Oliver
Carmine Vittoria
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 …
Enhanced Coercive And Remanence Fields For Cofe₂O₄ And Bafe₁₂O₁₉ Bilayers Deposited On (111) Mgo, S. D. Yoon, S. A. Oliver, C. Vittoria
Enhanced Coercive And Remanence Fields For Cofe₂O₄ And Bafe₁₂O₁₉ Bilayers Deposited On (111) Mgo, S. D. Yoon, S. A. Oliver, C. Vittoria
Carmine Vittoria
High quality epitaxial bilayer films of spinel CoFe₂O₄ (CoF) and M-type hexagonal ferrite BaFe₁₂O₁₉ (BaM) were deposited onto (111) magnesium oxide (MgO) substrate by pulsed laser ablation deposition. X-ray diffraction patterns of both BaM/CoF and CoF/BaM films showed only (0001) BaM, (111) CoF, and (111) MgO peaks. The highest coercive field of Hc=1.4 kOe was obtained for a BaM/CoF film where the CoF layer was deposited at 400°C, which was higher than typical Hc values of ∽0.4 kOe found for single layer BaM films on (111) MgO. This was less than the Hc ∽3.0 kOe found for (111) CoF films …
Microwave And Magnetic Properties Of Barium Hexaferrite Films Having The C-Axis In The Film Plane By Liquid Phase Epitaxy Technique, S. D. Yoon, C. Vittoria
Microwave And Magnetic Properties Of Barium Hexaferrite Films Having The C-Axis In The Film Plane By Liquid Phase Epitaxy Technique, S. D. Yoon, C. Vittoria
Carmine Vittoria
We report the growth of thick barium hexaferrite (BaFe₁₂O₁₉,BaM) films on m-planes ([1100] or [1010]) sapphire (Al₂O₃) substrates by the liquid phase epitaxy deposition technique. The procedure entailed the deposition of seed layers of BaFe₁₂O₁₉ onto the substrate by the pulsed laser ablation deposition and then dipping the substrate into a molten flux for 2 h. The total thickness ranged from 60 μm to 200 μm. The vibrating sample magnetometer (VSM) measurement data showed that the film exhibited magnetic uniaxial anisotropy axis in the film plane. The coercive field was relatively small, range of Hc was from 0.007 kOe to …