Modern Magnetoceramics: Basic Principles and the Impact of rf Ferrites Devices on the 5G Revolution
ABSTRACT :
Magnetoceramics are insulating magnetic materials that offer high performance and a means to break time reversal symmetry at RF frequencies. As such, these materials provide non-reciprocal performance in RF isolators and circulators among other devices. Here, we present a review of the basic principles of modern magnetoceramics in the context of next generation RF device electronics including self-biased circulators/isolators, and filters and phase shifters.
Starting from a material science perspective, the chemistry, structure, and super-exchange magnetism of magnetoceramics will be discussed. Following this, the role of intrinsic material properties upon functional RF device performance will be presented, including coercivity, magnetic anisotropy, FMR linewidth, magnetism, and device isolation and insertion loss. Additionally, the methods used to process magnetoceramics into usable RF device materials, such as manipulating magnetic anisotropy using crystallographic texture and the integration of ferrite materials onto lattice matched semiconductor substrates, will be reviewed.
ABOUT THE SPEAKER:
Vincent Harris (B.Sc., M.Sc., Ph.D., M.Sc., M.Eng.) has had a distinguished career as an engineer, scientist, inventor, and entrepreneur for nearly three decades. He presently holds positions as University Distinguished Professor and William Lincoln Smith Chair at Northeastern University. He is the Founder and Director of the Center for Microwave Magnetic Materials and Integrated Circuits and Metamagnetics Inc. Prior to holding these positions, he was a member of the technical staff, Head of the Complex Materials Section, and Head of the Materials Physics Branch at the Naval Research Laboratory (Washington, DC). His research interests include materials design and the study of processing, structure and magnetism in a wide range of electronic materials and devices used principally in radio frequency applications. He has been elevated to Fellow of the AAAS, IEEE, American Physical Society, and the Institute of Physics (UK). Harris has also served as a Fulbright Fellow at the Wyamba University of Sri Lanka.