Publication Date


Document Type


Committee Members

Robert Fitch (Committee Member), Marian Kazimierczuk (Committee Member), Yan Zhuang (Advisor)

Degree Name

Master of Science in Engineering (MSEgr)


For years technology developers have been reassessing current technology for ways to cut size and cost while maintaining or improving performance. One particular area that continues to grow in importance, yet remains difficult to reassess, are nonreciprocal devices. Components such as isolators and circulators are typically constructed using ferrite materials and permanent magnets; unfortunately, due to size and material properties, those materials are poor choices when attempting to scale down.

The following experiments investigate the ferromagnetic material NiFe and various patterning methods as potential solutions to the scaling and cost questions driven by modern technology requirements. NiFe is of interest since it can be fabricated using standard photolithography techniques, exploited to prevent conduction, and maintain a magnetic field without a permanent magnet. Line width, line length, spacing between lines, device placement, NiFe thickness, and patterning parameters for a coupled transmission line are manipulated through fabrication and then characterized. Results are scrutinized for nonreciprocal tendencies and ferromagnetic resonance peak locations. A shift of 1 GHz was found when NiFe thickness increased. Nonreciprocal characteristics were also enhanced when space between the coupled lines decreased, resulting in a 350MHz shift. Designs that offered promising results will assist with determining the direction of future experiments.

Page Count


Department or Program

Department of Electrical Engineering

Year Degree Awarded