納米線的磁特性的數(shù)值計算.pdf

1、Y996229學校編號—韭i墜一囤書分類號——日上璺壘塑8土女g：——福建師范大學碩士學位論文納米線的磁特性的數(shù)值計算NumedcalCaIculationofMagneticPropertiesforNanowires鐘克華學科專業(yè)研究方向指導(dǎo)教師申請學位級別望監(jiān)塑理豎囂查麴望黃直匿熬量里堂亟論文提交日期論文評閱人論文答辯日期菩辯委員會主席學位授予單位學位授予目期2006年04月墊盟主姐墊墮生業(yè)擅建堙亟盤塋2006年06月摘要Abst

2、ractInthisthesis，themagneticpropertiesofnanowiresandtheirarraieshavebeenstudiedwithnumericalmethodsThepurposeistoinvestigatethemagnetizationreversalofnanowiresbystudyingthemacroscopicalquantityThemaincontentsofthispapera

3、rearrangedasfollows：Firstlywepresenttheessentialconception，phylogenyphysicalcharactersofnanomaterial，thephylogenyandresearchactualityofmagneticnanowirearrayFollowing，wemostlypresentthebasaltheoryinvolvedinthispaperItincl

4、udedmagnetichysteresisloops，theenergytermsconsideredinthesimulationandthemagneticreversalmechanismAfterward，wechieflyintroduceMonteCarlomethodandfastFouriertransformationandmicromagnetism(FFTM)SecondlybasedonMonteCarlome

5、thod，weinvestigatedmagnetichysteresisloops，coercivityasfunctionsoftemperatureandangle，switchingfieldasafunctionofangle，andthemagneticreversalmechanismThesimulatedresultsareconsistentwiththeexperimentaldataOnonehand，using

6、twokindsofdiscretizationcellsregularglobal—shapedandregularcubicshapedasminimumelement，themagneticpropertiesofFenanowirewerestudiedThesimulationresultsreveaIasfollows：①Thesimulatedresultsusingtheglobalshapeddiscretizatio

7、ncellhavemoreaccurateresultswhichiscomparedtOtheexperimentalresultthanthoseusingthecubicshapeddiscretizationcelldoes②ThecoercivityofthemagneticnanowiredecreaseswithincreasingnanowirediameterThischangetrendisagreementwith

8、theexperimentalfact③TheT—power—lawdescribesthe且、一TcurveswellOntheotherhand，basedonMonteCarlomethod，wesimulatethemagnetizationcurvesofvarioussingleConanowiresatroomtemperatureThesimulatedswitchingfieldasafunctionofangles(