Microstructure and magneto-optical properties of Pr{endash}Ni substituted Ba hexaferrite films prepared by sputtering
- Department of Materials Science, Japan Advanced Institute of Science and Technology, Asahidai 1-1, Tatsunokuchi, Ishikawa 923-12 (Japan)
- Department of Physical Electronics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152 (Japan)
Hexaferrite thin films of Ba{sub 1{minus}x}R{sub x}Fe{sub 12{minus}x}Ni{sub x}O{sub 19} (R=Pr, La) were grown on nonmagnetic garnet substrates by rf sputtering. When deposited at a substrate temperature of 550{degree}C at rf power density (PD{sub rf}) larger than 19W/cm{sup 2}, the films were completely crystallized, with the c axis preferentially oriented normal to the film plane. Transmission electron microscopy revealed that the films deposited at low PD{sub rf} were amorphous but locally contained microcrystallites several nm in size. On the other hand, the films deposited at PD{sub rf} larger than 20W/cm{sup 2} were polycrystalline with a crystallite size as large as 300 nm. Faraday rotation measurements showed that the Ni substitution induced a large negative rotation in the photon energy range of 2.1{endash}2.6 eV. This Ni contribution was predominantly attributed to the crystal-field transition of octahedrally coordinated Ni{sup 2+} ions lying in the 2 eV range. No contribution by Pr{sup 3+} ions to the Faraday rotation was observed within the photon energy range measured. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 544793
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 10; Other Information: PBD: Nov 1997
- Country of Publication:
- United States
- Language:
- English
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