NDLI: Microwave composites filled with ferromagnetic films

Content Provider	IEEE Xplore Digital Library
Author	Iakubov, I.T. Lagarkov, A.N. Maklakov, S.A. Osipov, A.V. Rozanov, K.N. Ryzhikov, I.A. Starostenko, S.N.
Copyright Year	2005
Description	Author affiliation: Inst. for Theor. & Appl. Electromagn., Moscow, Russia (Iakubov, I.T.; Lagarkov, A.N.; Maklakov, S.A.; Osipov, A.V.; Rozanov, K.N.; Ryzhikov, I.A.; Starostenko, S.N.)
Abstract	For many technical applications, magnets with high microwave permeability are needed. For such magnets, both static permeability /spl mu//sub s/ and the ferromagnetic resonance frequency f/sub r/ must be high. These values depend greatly on the manufacturing process of the magnet, though are tightly related each to other. The microwave performance of bulk magnets is governed by well known Snoek's law. According to computations, thin films are better than bulk magnets in their potential microwave performance. Also, thin ferromagnetic films may have the highest microwave permeability values of all magnets. However, bulk samples are necessary for most applications. As ferromagnets are conductors, the high-frequency behavior of thick ferromagnetic films may be due to the effect of eddy currents rather than due to the ferromagnetic resonance. For normally incident waves, dielectric response arising because of the conductivity is dominant over the magnetic response. These drawbacks are overcame with the use of magnetic composites filled with pieces of thin ferromagnetic films. In this case, /spl mu//sub s/ and f/sub r/ are still related, with the volume fraction of the magnetic films, p, and a proper randomization factor being introduced as a factor. It is easily estimated that even at small p, e.g., p=0.1 and with the values of f/sub r/ and 4/spl pi/M/sub o/, /spl mu//spl ap/20 that is still larger than the-values typical for microwave ferrites.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	2067
Ending Page	2068
File Size	213455
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1464472
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnets Magnetic resonance Permeability Magnetic films Dielectric thin films Conductive films Resonant frequency Manufacturing processes Transistors Eddy currents
Content Type	Text
Resource Type	Article

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