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Soft Magnetic Thin Film Applications at Radio Frequencies

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  • Visitor Seminars
When Feb 21, 2012
from 09:30 AM to 10:30 AM
Where ENGR. IV Bldg. Tesla 53-125
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Dr. Masahiro Yamaguchi

Department of Electrical and Communication Engineering

Tohoku University




Development of new passive component technologies will enable a “More-than-Moore” paradigm leading to innovative application-specific compact systems. Ferromagnetic thin film materials, having high permeability at (and above) radio frequencies, are candidate materials for use in inductive passive components that are available in the forms of vacuum-deposited and electro-deposited metallic alloys, chemically synthesized nano-particulate composites, and traditional oxides, among others. Using these materials, the development of CMOS integrated inductors and integrated electromagnetic noise suppressors for Long Term Evolution, or 3.9th  Generation, cell phone RFIC and Point-of-Load one-chip DC-DC converters, is attracting great interest from both academic and industrial communities.


This lecture begins with a review of new soft magnetic thin film applications at radio frequencies for future system-in-package (SiP) and system-on-chip (SoC) technologies. Proposed in late 1970s, these thin film soft magnet applications have evolved from inductive read/write recording head technology to the frontiers of GHz frequency device applications. Discussions covered in this lecture include:  (1) Development of international cross measurements of 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 signal lossy application to CMOS integrated electromagnetic noise suppressor; (4) small to medium signal applications as new metal/ferromagnetic multi-stack “conductors” to suppress skin effect utilizing negative permeability beyond the FMR frequency [μr’< 0, μr”≈0]; and, (5) large current permeable application to Point-of-Load type one-chip DC-DC converters. The lecture will conclude with an outlook that provides a perspective on the future of on-chip RF magnetics.


Masahiro Yamaguchi received the BS-‘79, MS-‘81 and PhD-‘84 degrees in electrical and communication engineering from Tohoku University, Sendai, Japan. Since 2003 he has been serving as professor in the Department of Electrical and Communication Engineering, Tohoku University. He is also with the New Industry Creation Hatchery Center (NICHe), Tohoku University, since 2010. He is currently the chairman of the committees on On-Chip RF Magnetics of the Institute of Electrical Engineers of Japan (2011-2014).  His research interest covers (1) RF permeability and FMR measurements for magnetic thin films, (2) RF magnetic field measurements for IC chips to analyze and countermeasure electromagnetic interference, and (3) application of soft magnetic materials for on-chip RF devices including thin film inductor, noise suppressor and skin-effect free multilayer conductor for telecommunication and micro power-conversion technologies.


For more information, contact Eileen Paguito (


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