钡铁氧体磁光薄膜的制备与性能研究

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1、上海大学硕士学位论文钡铁氧体磁光薄膜的制备与性能研究姓名：周炯申请学位级别：硕士专业：光学指导教师：马洪良20060501上海大学硕=E学位论文AbstractBariumferritehasattractedla坞ea札emionduetoitsexcellentchemistrystability，aJlti—causticity，hi曲aIlisotropya11dhi曲coercivityrecemyears．ThisfeHDmagneticmateriaIhasbeenwideIyappIiedinthemanufactllring

2、ofmagnetismandmagneto—opticdeVices．Firstly，血ebestmixtureratioofSol·gelmethodprecursorwaspreparedbychangingtheinitialfactorssuchlikedi丘毫rentFe／Bamolratio，molratioRofcitricacidtothenitrate，pHvaluea11dtl】eannealedtemperature．MagneticpowdersofBaFelI501825andBa(CoZr)xFell5—2xO28

3、25serieswerepr印ared．Then，cobaltnitrateandzirconiumnitratewereinnovativelyintroducedaccordingtothesubject．Magnetict11infilmsofBaFeH501825andBaFe2280442se“eswerepreparedbyusingSol—gelspinningandmagneto-opticthinfilmsofBa(CoZr)xFell5．2xol825serieswerepreparedbyPulsedLaserDepos

4、itjon(PLD)technique．Secondly，DSC／TGXRD，AFM，VSMandRamanSpectroscopicAnalysiswereutilizedtostudyonthebariumfbrritepowdeLthinfilmandthedopedsamples．Theresuhsshowedthecorrespondingsurfacemicrostmcture，magneticperformanceandR锄anspectrum．Finally，putthe“nmmwimopticalrotationasmagn

5、et0—0pticmaterialdirectlybetweenpol捌zerandpolarizationa芏1alyzer，usingextinctionmethodtomeasuremagneto—opticeff毫ct，weobtainedthetransmissionratiocurve，mtationa1191eandmagneto—opticalflgureofmeritbychangingthewaVelengthoflaseLThemainexperimentalresultsasfollows：1、AsthebariLln

6、lferritcthiⅡ丘lm，t}lebestmagneticperforfnanceofBaFe2280442thinfilmwaspreparedundertheannealedtemperatureof1000℃whenpH=8aIldR=1．TheexperimentalresultexhibitedthattheperpendicularsquarenesswasO．60whilethein-plane’swas0．53．Theperpendjcularandin—plane’ssaturationmagnetizationsan

7、dcoercivitieswerel79em“cm3，47640ea11d198emu／cm5，36450e，respectiveIy．上海大学硕士学位论文2、AstheBa(Cozr)xFell5—2x01825magneticperfomlancewithdin、erem锄ountofdoping，山ebestdoping锄oum、vas0．2．Thein—plane’scoercivitywas10000e，whjleM§(1T)aildMrwas54cm毗mjaIld25em“cm3．耵leperpendiclll盯coercivit

8、ywas9500e，whileMs(1T)andM，was56emu／cm3and27em“cm3．3、Magneto·optice行bctwasmeasllred