GeSi基稀磁半导体的结构与性质研究

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1、河北师范大学硕士学位论文Ge（Si）基稀磁半导体的结构与性质研究姓名：赵建国申请学位级别：硕士专业：凝聚态物理指导教师：侯登录20080603AbstractInmodeminformationtechnology,informationprocessingisbasedonthecontrolofthechargeofthecarrier,aswellastheinformationstoragetechniqueusesthespinofthecarriers．Theuseofbothspinandchargeofthec

2、arriersappearspromisingforanewclassofdevicesuchaschipsthatintegratememoryandmicroprocessorfunction，magneticdevicesexhibitinggainandultra—lowpowertransistors．Muchoftheattentionondilutedmagneticsemiconductor(DMS)materialsisduetoitspotentialapplicationinwhatisnowcalled

3、‘‘spintronics”devices，whichexploitspininmagneticmaterialsalongwithchargeofelectronsinsemiconductors．BecausethetraditionalsemiconductorindustryisbasedontheSimaterial，andGe(Si)magneticsemiconductoriseasytoachieveintegrationwiththecurrentsemiconductorindustryandtheinte

4、gration，whichsemiconductorhaswideruseofvalue．WepreparedMnxGel．xandMn。Sil．xsamplesbymagnetronsputteringwithhighconcentrationofMn，theconcentrationofMnisashighas19％inMnxGel．xsample，andtheconcentrationofMnisashighas15％inMnxSil．xsample．Westudythestructure，chemicalstate，t

5、ransportofsamples，magneticdomain，resistivitydependenceofMnconcentrationandtemperatureandHaileffect．Conclusionsareasfollows：TheXRDmeasurementshowsnodiffractionpeaksinthedepositedMnxGel．xsamples，wichsuggeststhatthesamplesareofnocrystallization．ButtheMnxGel．xsampleswit

6、h600。Cannealingshowsinglephasestructure．ThecrystallatticeconstantincreaseswiththeMnconcentration．Nofilmsshowclearmagneticdomainstructureunderamagneticforcemicroscope(MFM)，whichsuggestthattherearenoclustersinthesample．AFMshowsthatallfilmshaveauniformparticlesizedistr

7、ibution，andacolumnargrowthpattern，withparticlesizeof6nnlandroughnessof3n／ninMnxGel-xsample．X-rayphotoelectronspectroscopy(xPs)measurementsindicatethattheMnatomsaleinthe+2valence．Theresistivityversustemperature(R-T)measurementsshowsobviouslysemiconductingproperty．The

8、HalleffectmeasurementofMnxGel．xmagneticsemiconductorsshowsnormalhalleffect，andallthesamplesarep-typesemiconductor．Concentrationofcarders，w