1. Advanced Microwave Ferrite Research (AMFeR): Phase Two
- Author
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IDAHO UNIV MOSCOW, Young, Jeffrey L., IDAHO UNIV MOSCOW, and Young, Jeffrey L.
- Abstract
Reported herein are the key findings and activities associated with the Office of Naval Research (ONR) Advance Microwave Ferrite Research (AMFeR) Phase Two project. This project was conceived to develop high anisotropy ferrite crystals for microwave, self-biased circulator devices. To accomplish the research objectives stated in the proposal to ONR, the AMFeR team organized itself into three task-oriented groups: material fabrication, micromagnetic modeling and microwave device design. Principle team members of the material fabrication group included Profs. Y.-K. Hong, D. McIlroy, and W. J. Yeh. Prof. R. Wells led the effort in micromagnetic modeling; Prof. J. Young was the principle project director and group leader for the microwave device group. To date, barium-ferrite, c-axis crystals have been grown using several methods, including sputtering and liquid phase epitaxy, with the latter method being the most successful for the growth of thick crystals in excess of 100 microns. The crystals were characterized using a variety of apparatuses including a vibrating sample magnetometer (VSM), x-ray diffractometer (XRD), single crystal x-ray diffractometer, scanning electron microscopy (SEM), optical microscopy, and magnetic force microscopy (MFM). Anisotropy fields and saturation magnetization were found via measurement to be in the range of 10 to 18 kOe and 4.0 to 4.6 G, respectively; both of these ranges are consistent with other findings found in the literature. Micromagnetic simulations were carried out for various experimental films developed by the materials team. Simulations of magnetic domain wall motion for the single crystal LPE films were a qualitative success, but a complete set of parameters for these films has not yet been achieved.
- Published
- 2006