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Kumar Vishal_Master thesis.pdf (2.26 MB)

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Nonreciprocal magnetostatic surface wave in thin ferromagnetic film

Vishal, Kumar
http://orcid.org/0000-0002-6059-9604
http://rave.ohiolink.edu/etdc/view?acc_num=wright1472018768

Abstract Details

2016, Master of Science in Electrical Engineering (MSEE), Wright State University, Electrical Engineering.
Interest in the nonreciprocal property of waves inside the magnetic material starts with its current advancement in the field of passive devices. In current technology passive devices without magnetic cores are realized on a silicon chip, usually these devices are lossy and bigger in size. Passive devices constructed with magnetic core material such as isolators, circulators, phase shifters, and gyrators; gives us the chance to minimize such losses. Nonreciprocity in magnetic material is due to the anisotropic property of permeability, it is complex in nature and represent in 3×3 matrix form. We can control the wave flow inside the nonreciprocal devices by making some changes in the matrix. This thesis work includes modeling, simulation, and investigation of ferromagnetic material to enhance nonreciprocity effect. We perform physical measurement on actual devices and then use the same parameters to design the model in comsol multiphysics software to verify the nonreciprocity. This thesis work also suggests different ways to suppress eddy current losses to increase the nonreciprocity effect. Comsol is a simulation tool for our RF passive device model containing magnetic core material. All simulation results were obtaining from comsol; it is used as to model the device and set different parameter defined for ferromagnetic devices. We successfully investigate the nonreciprocity inside the magnetic material by analyzing scattering parameters (S12 and S21). The design of any nonreciprocal device is a big challenge because propagation losses are more, even a small change in structure suppress the nonreciprocity effect. This work has shown that by using these improved configurations we can reduce loss and enhance the overall device performance. Nonreciprocal spin iv wave has been observed in the ferromagnetic thin film by placing it between neighboring metallic layer. By proper selection of line width, spacing between signal lines, position, and thickness of films, the maximum nonreciprocity up to -26.0 dB for NR-Amplitude and -180.0° phase difference for NR-Phase is reported.
Yan Zhuang, Ph.D. (Advisor)
Saiyu Ren, Ph.D. (Committee Member)
Marian Kazimierczuk, Ph.D. (Committee Member)
Brian Rigling, Ph.D. (Other)
90 p.
Electrical Engineering; Electromagnetics; Electromagnetism; Engineering; Materials Science
Nonreciprocal; Magnetostatic; Surface wave; Ferromagnetic; Magnetic films; Tensor permeability

Recommended Citations

Citations

  • Vishal, K. (2016). Nonreciprocal magnetostatic surface wave in thin ferromagnetic film [Master's thesis, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1472018768

    APA Style (7th edition)

  • Vishal, Kumar. Nonreciprocal magnetostatic surface wave in thin ferromagnetic film. 2016. Wright State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1472018768.

    MLA Style (8th edition)

  • Vishal, Kumar. "Nonreciprocal magnetostatic surface wave in thin ferromagnetic film." Master's thesis, Wright State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1472018768

    Chicago Manual of Style (17th edition)

wright1472018768
772
© 2016, all rights reserved.
This open access ETD is published by Wright State University and OhioLINK.