Physics ABC Seminar: Dr. Michael Page, Air Force Research Lab, Wright-Patterson Air Force Base, OH
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Speaker: Dr. Michael Page, Air Force Research Lab, Wright-Patterson Air Force Base, OH
Title: High Frequency Acousto-Magnetic Electronics
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Meeting ID: 980 1804 8459
Modern warfare will take place in environments in which a complex and hostile electromagnetic spectrum exists. Rather than the permissive environments of the past, warfighters will have to operate in a contested EM spectrum facing near-pear technology absent the advantage of vastly superior capabilities. Disruptive advancements in RF/microwave technologies will be required to maintain our warfighter technology advantage. One particularly promising avenue of exploration for novel high frequency devices lies within the field of strain mediated multiferroics. While multiferroics has a rich history of advancement, currently, the field has largely been limited to the study of how static changes in one order parameter affect the dynamics of another. As an alternative approach, my work focuses on the exploration of phonon/magnon interactions in multiferroic heterostructures. In particular, we seek to understand the interconversion between high frequency strain in piezoelectrics and dynamic magnetic properties in an adjacent magnetic material. These explorations are enabling new understanding of the dynamics of interactions between various multiferroic ordered states resulting in advances in materials, characterization methods, and device design in multiferroic heterostructures.
Specifically, I will discuss my work in Acoustically Driven Ferromagnetic Resonance (ADFMR) and a variety of interesting results both from a fundamental science aspect as well as with an eye towards applications, such as compact RF isolators. In support of these devices and for other efforts, I will also describe our progress in growing exceptionally high quality epitaxial magnetic films such as yttrium iron garnet and spinel ferrites. Finally, I will discuss the suite of characterization tools we have developed for high-frequency and high resolution imaging of magnetic and acoustic dynamics such as scanned nitrogen vacancy center magnetometry, Brillouin light scattering, and acoustic wave imaging.