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Soft Magnetic Thin Film Applications at Radio Frequencies

Event Details

Event Dates: 

Thursday, May 3, 2012 - 11:30am

Speaker Name(s): 

Masahiro Yamaguchi

Speaker Affiliation(s): 

Department of Electrical and Communication Engineering, Tohoku University, Japan
Seminar Type/Subject

Event Details & Abstract: 

Development of new passive component technologies will enable a “More-than-Moore” paradigmleading to innovative application-specific compact systems. Ferromagnetic thin film materials, havinghigh permeability at (and above) radio frequencies, are candidate materials for use in inductivepassive components that are available in the forms of vacuum-deposited and electro-depositedmetallic alloys, chemically synthesized nano-particulate composites, and traditional oxides, amongothers. Using these materials, the development of CMOS integrated inductors and integratedelectromagnetic noise suppressors for Long Term Evolution, or 3.9th Generation, cell phone RFICand Point-of-Load one-chip DC-DC converters, is attracting great interest from both academic andindustrial communities. This lecture begins with a review of new soft magnetic thin film applicationsat radio frequencies for future system-in-package (SiP) and system-on-chip (SoC) technologies.Discussions covered in this lecture include: (1) Development of international cross measurementsof RF permeameters to evaluate RF permeability and related FMR profiles of magnetic films; (2)small signal high permeable low loss applications to CMOS integrated inductors; (3) small signallossy application to CMOS integrated electromagnetic noise suppressor; (4) small to medium signalapplications as new metal/ferromagnetic multi-stack “conductors” to suppress skin effect utilizingnegative permeability beyond the FMR frequency [μr’< 0, μr”≈0]; and, (5) large current permeableapplication to Point-of-Load type one-chip DC-DC converters. The lecture will conclude with anoutlook that provides a perspective on the future of on-chip RF magnetics.Masahiro Yamaguchi received the B.S., M.S. and Ph.D. (Dr. Eng.) degrees in electrical andcommunication engineering from Tohoku University, Sendai, Japan, in 1979, 1981, and 1984,respectively. Dr. Yamaguchi was an associate professor with the Research Institute of ElectricalCommunication, Tohoku University from 1991 to 2003. Since 2003 he has been serving asprofessor in the Department of Electrical and Communication engineering, Tohoku University. He isalso with the New Industry Creation Hatchery Center (NICHe), Tohoku University, since 2010.

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