Magnetic materials and devices across frequency ranges

Frequency ranges of various magnetic materials and resonator designs.

Under the umbrella of communications, our research is focused on developing ultra-broadband tunable resonators, filters, and other wireless components to enable a single device to communicate across a wide range of frequencies in the microwave and millimeter wave regimes. This research focuses on the design of high frequency resonators using magnetic/piezoelectric material composites with ultra-high frequency magnetic permeabilities and voltage-controlled tunability via strain-induced changes to the permeability. By incorporating ferromagnets, ferrimagnets, and even antiferromagnets into such devices, this research will open the door to a new genre of high frequency integrated tunable devices.

HFSS simulation example Ferromagnetic patterned films
Static and tunable inductors Tunable integrated waveguides
High anisotropy of GdCo heterostructures Material integration onto many different substrates

Selected Relevant Publications:

  • K. Srinivasan, A. El-Ghazaly, “A Design Methodology for a Dual-Mode Coplanar Waveguide Junction Circulator,” International Microwave and Antenna Symposium (IMAS), Marrakesh, Morocco, 2024. DOI: 10.1109/IMAS61316.2024.10818141
  • Rabia Yahya, Haosen Yin, David Bertuch, A. El-Ghazaly, “Optically Transparent 4-port UWB Antenna for MIMO Applications,” International Microwave and Antenna Symposium (IMAS), Marrakesh, Morocco, 2024. DOI: 10.1109/IMAS61316.2024.10818046
  • K. Srinivasan, Y. Chen, L. Cestarollo, J. G. Wright, D. K. Dare, A. El-Ghazaly, “Engineering Large Perpendicular Magnetic Anisotropy in Amorphous Ferrimagnetic Gadolinium Cobalt Alloys,” Journal of Materials Chemistry C, 11, 4820-4829, 2023. DOI: 10.1039/D3TC00332A
  • K. Srinivasan and A. El-Ghazaly, “Tunable Non-Reciprocal Phase Shifter and Spin-Coated Ferrites for Adaptive Microwave Circuits,” International Microwave and Antenna Symposium (IMAS), Cairo, Egypt, 2023. DOI: 10.1109/IMAS55807.2023.10066899
  • A. El-Ghazaly, B. Tran, A. Ceballos, C. H. Lambert, A. Pattabi, S. Salahuddin, F. Hellman, and J. Bokor, “Nanoscale Ultrafast Magnetization Switching,” Applied Physics Letters, vol. 114, no. 23, 2019. DOI:10.1063/1.5098453
  • A. El-Ghazaly, J. T. Evans, N. Sato, N. Montross, H. Ohldag, R. M. White, and S. X. Wang, “Electrically-Tunable Integrated Thin-Film Magnetoelectric Resonators,” Advanced Materials Technologies, vol. 2, no. 8, 2017. DOI:10.1002/admt.201700062
  • A. El-Ghazaly, R. M. White, and S. X. Wang, “Gigahertz-band Integrated Magnetic Inductors,” IEEE Transactions on Microwave Theory and Techniques, vol. 65, no. 12, 2017. DOI:10.1109/TMTT.2017.2728040