feco-sio_2c2_（mgf_2c2_）纳米颗粒膜的高频软磁特性

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1、AbstractVstructures．Inaddition．theresultsofXRDandTEMindicatethatthecrystallitesizeisclosetothatofpanicles．II．Magnetism(I)(Fe65C035)-Si02system(1)ThedependenceofcoercivityHoonmetalvolumefractionxwassystematicallystudied．InthewiderangeO．5

2、oftmagneticpropertiesareobtainedinthiswideXrange．TheseexcellentsoftmagneticpropertiesintheFeCo．Si02systemcanbeunderstoodbyexchangecouplingbetweenFeCopanicles．ForFe65C035，theexchangelengthL露canbecalculatedouttobeabout26nm，whichismuchlargerthanthesumofmetalparticlesizeandthedi

3、stancebetweenthem．Therefore，exchangeinteractionbetweenpaniclesmaytakeplaceinthewidexrange，whichaveragesoutthemagneto—crystallineanisotropyofindwidualparticlesandovercomesthedemagnetizationeffectAsaresult,thecoercivityHodiminisheseffectively．(2)ThedependenceofanisotropyHRonme

4、talvolumefractionxwasalsosystematicallystudied．Withdecreasingx，theanisotropy凰increasesfirst，thendecreaseswhenx<0．57，thetrendiscontrarytothatofHe．AlsointherangeofO．48

5、rangewithstrongexchangecoupling．(3)Forthesampleofx=0．48，lowcoercivityof3．0Oeandgoodin-planeuniaxialanisotropyaswellasveryhighresistivityof1．12x104UQ·cmmakeitquitepromisingfortheapplicationinthehighfrequencyrange．(4)8M(功plotwasemployedtostudytheintergranularinteractionsystema

6、tically．Researchresultsshowthat8Mfir)ispositiveforallsampleswith0．4

7、elpofthehigh—resolutiontransmissionelectronmicroscopy(阳m峋，andresultsshowthatthemicrostmctureofx=0．57satisfiestheoptimizationconditionforrealizingexchangecoupling．(5)ResultsofMossbauermeasurement1)Forsampleswithstrongexchangecoupling，themagneticmomentliesinthefilmplane2)314)o

8、rdepartsfromthefilmplanewithalittleangle．Forthetypicalsamplewithx=O．57，thea