Ti襯底層對FePt納米顆粒膜L1-,0-織構(gòu)形成的影響.pdf

1、河北師范大學(xué)碩士學(xué)位論文Ti襯底層對FePt納米顆粒膜L1織構(gòu)形成的影響姓名：于紅云申請學(xué)位級別：碩士專業(yè)：凝聚態(tài)物理指導(dǎo)教師：孫會元20050420河北師范大學(xué)碩士學(xué)位論文AbstractIhispaperhassummarizedtheexperimentalandtheoreticalresearchprogressofgranularfilmsfirstlyAndthepresentmajorproblemstobesolved

2、havebeendiscussedsubsequentlyThepurposeandmeaningofthispaperarestatedonthisfoundationSoonafterwardsthispaperhasintroducedourworkInourexperiments，F(xiàn)ePt／TiandFePt／(FePt)xTil_xgranularfilmswerefabricatedontoglasssubstratesus

3、ingadefacing—targetmagnetronsputteringsystemSubsequentlythesampleswere加situannealedatappmpdatetemperaturesThemierostrnctureswereexaminedbyX—raydiffraction(XRD)Magneticpropertiesweremeasuredbyvibratingsamplemagnetometer(V

4、SM)Andthemorphologiesanddomainstructureswereobservedbyscanningprobemicroscope(SPM)ThemicrostructurcandmagneticpropertieswereanalyzedasfunctionsofthethicknessofTilayer(O，annealingtemperature(咒)andsubstratetemperature(正)in

5、detailTheinternalmechanismofTilayerinducingFePtLl0structureWaSsummarizeddefinitelyThethicknessesofTiunderlayerannealingtemperatureandtheorientationoftheunderlayerhavegreateffectsonthemicrostructurcandmagneticpropertiesof

6、FePtfilms，WiththeadditionofTi，F(xiàn)ePt(10nm)／Ti(tnm)filmspossessedpartlyorderedLlo(111)textureandthedispersionofgrainsismuchmoreuniformthanFePtmonolayerfilmsWhenthethicknessofTilayeriSbeyond25nm，thesurfaceaverageroughnessbeg

7、instoincreaseThegrainsoffilmsgathertogetherslightlywhenannealingtemperatureisbeyond450。CFePt／Tifilm、ⅣitIlmostorderedL10structureisobtainedatt=25nmand瓦=550oC，whichhasmaximumcoercivitytimcurvesshowthattheexchange—interacti

8、onbetweenmagneticgrainsdecreasessignificantlywiththeadditionofthinTiunderlayerPartlyorderedTix(FePthxOv01％)underlayerCaninduceepitaxiaigrowthoftheperfectlyorderedLlostructureFePtfilms，MostlyorderedLlotextureinFePt(30nm)／

9、TiTs(FePt)22(45nm)filmsisobtainedat兀=250oCandtheaveragegrainsizeissmallerthanthefilmsdepositedatroomtemperatureWellisolateddomainswerefoundinthissampleandmostofthegrainsexhibitsingle—domainstructureKeywords：Magneticrecor