Formation of magnetically-oriented barium hexaferrite films by aerosol deposition

• Published in: Journal of magnetism and magnetic materials Vol. 479; pp. 156 - 160
• Main Authors: Johnson, Scooter D., Park, Dong-Soo, Qadri, Syed B., Gorzkowski, Edward P.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2019; Elsevier BV
• Subjects: Aerosol deposition; Barium hexaferrite; Ceramics; Circulator; Coercivity; Crystallography; Deposition; Grain orientation; Magnetic anisotropy; Magnetic properties; Magnetic saturation; Magnetism; Microwave; Permanent magnets; Self-bias; Substrates; Texturing; Microwave; Aerosol deposition; Barium hexaferrite; Ceramics; Circulator; Self-bias
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.02.025

•Aerosol deposition is used to grow barium hexaferrite films.•A 4 kOe magnetic field was placed during deposition to magnetically orient the films.•Films are found to be oriented out-of-plane.•Sintering the films further improved the magnetic properties.•March-Dollase factor finds 29% grain alignment. We have deposited polycrystalline films of barium hexaferrite utilizing aerosol deposition at room temperature. Magnetic orientation was achieved by using a 4 kOe permanent magnet mounted in close proximity to the substrate during deposition. We find that these films show crystallographic orientation and magnetic anisotropy out of plane corresponding to the {0 0 2l} diffraction planes. To further explore the film properties we performed sintering treatments up to 1000 °C and found that the magnetic properties are further improved. For these films the magnetic saturation is 3683 G with a squareness value of 0.82. The magnetic and crystallographic texturing indicate 29% grain orientation with a coercivity of 4.6 kOe. These values indicate that the films are of good quality for potential integration into microwave systems that require high values of saturation magnetization, squareness, and coercivity with a good degree of self-bias.