納米線的磁特性的數(shù)值計(jì)算.pdf

1、Y996229學(xué)校編號(hào)—韭i墜一囤書分類號(hào)——日上璺壘塑8土女g：——福建師范大學(xué)碩士學(xué)位論文納米線的磁特性的數(shù)值計(jì)算NumedcalCaIculationofMagneticPropertiesforNanowires鐘克華學(xué)科專業(yè)研究方向指導(dǎo)教師申請(qǐng)學(xué)位級(jí)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(píng)閱人論文答辯日期菩辯委員會(huì)主席學(xué)位授予單位學(xué)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(