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1、Magneticandelectromagneticwaveabsorptionpropertiesofa・Fe/Z・typeBa-ferritenanocompositesJiuRongLiu,MasahiroItoh,andKen-ichiMachida11CenterforAdvancedScienceandInnovation,OsakaUniversity,2・1YamadaokaSuita,Osaka565-0871,Japan(Received16August2005;accepted6December2005;publishedonline7February2006)
2、Thesaturationmagnetizationvalues(Ms)ofa-Fe/Ba3C01.8Fe23.6Cro.6O41nanocompositespreparedbymechanicallyalloyinga-FewithBa3Co1.8Fe23.6Cs.6O41powdersincreasedwithincreasingtheconcentrationofa・Fe.a-Fe/Ba3C01.8Fe23.6Cro.6O4〕nanocompositesshowedhighercoercivityvaluesthana-FeandBa3C01.8Fe23.6Cro.6O41be
3、causeoftheeffectsofshapeanisotropyandexchangebias.Theresincompactswith33.5vol%a-Fe/Ba3CoLxFe23.6Cr(),6O4i(3&70,85vol%a-Fe)powdersprovidedgoodelectromagneticwaveabsorptionperformancesinrangesof7.5-16.0,5.4-10.5,and43-8.3GHzovertheabsorberthicknessesof13-2.5,1<6-3.0,and1.7-3.2mm,respectively.©200
4、6AmericanInstituteofPhysics.[DOI:10.1063/1.2170402]Ferrites,asconventionalelectromagnetic(EM)waveabsorbingmaterials,havebeenwidelystudiedfrommegahertztoigahertz(GHz)rangebecauseoftheirstrongmagnetismandhighelectricresistivity11"31.ForEMwaveapplicationsthereisanincreasinginterestinusingferrite-p
5、olymerfilmsratherthanbulkferrites.But,thethicknessofferrite-polymerfilmshastobethickforefficientEMwaveabsorption,sinceitisdifficulttoincreasethepermeabilityvaluesinGHzrangeowingtoSnoek'slimitforferrites.Comparingwithferrites,metallicmagneticmaterialshavelargesaturationmagnetizationvaluesandthei
6、rSnoek^slimitisatahighfrequencylevel141.Consequently,thevaluesofcomplexpermeabilitycanremainstillhighinthehighfrequencyrange.Therefore,itispossibletomakethinnerabsorbersfrommetallicmagneticmaterialsthanthoseofferritesinGHzrangehl.However,metallicmagneticmaterialshavehighelectricconductivity,whi
7、chmakesthehighfrequencypermeabilitydecreaseddrasticallyduetotheeddycurrentlossinducedbyEMwaves⑹.Itisnecessarytousethesmallerparticlesthantheskindepthforreducingtheeddycurrentloss.Forexample,theskindepthofironinthe1-5GHzhasbeencalc
