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1、3506Chem.Mater.2007,19,3506-3511ElectrospinningofFe,Co,andNiNanofibers:Synthesis,Assembly,andMagneticPropertiesHuiWu,RuiZhang,XinxinLiu,DandanLin,andWeiPan*StateKeyLabofNewCeramicandFineProcessing,DepartmentofMaterialsScienceandEngineering,TsinghuaUniVer
2、sity,Beijing100084,People'sRepublicofChinaReceiVedJanuary30,2007.ReVisedManuscriptReceiVedApril10,2007Ageneralsyntheticmethodhasbeendevelopedtofabricateandassembleferromagnetictransitionmetalnanofibers.Byemployingthenovelelectrospinningtechniquefollowedb
3、ysubsequentheattreatment,wehavesuccessfullyprepareduniformnanofibersofFe,Co,andNiwithdiametersof25nmandlengthslongerthan100ím.Usingaspeciallydesignedfibercollector,wecanconvenientlyassemblemagneticnanofibersintoalignedarrays.Theelectrospunmagneticmetaln
4、anofibershaveuniquemagneticproperties,withmuchenhancedcoercivitiesrelativetobulkmaterials.Theoutstandingfeaturesofthisapproachtogetone-dimensionalmagneticnanostructureareitssimplicity,effectiveness,andeaseofassembly.Therefore,electrospunmagneticnanofiber
5、scanpotentiallybeusedinfabricationofhigh-densitymagneticrecording,magneticsensors,flexiblemagnets,andspintronicdevices.1.Introductionreversalinlow-dimensionalmagneticstructures.6,7Thekeysyntheticmethodologiestoget1DmagneticnanostructuresInthepastdecade,m
6、oreandmoreattentionhasbeen8developedsofarincludetemplateassistedelectrodeposition,drawntothefabricationofone-dimensional(1D)nanoma-910metallizationofDNA,nanolithography,organometallicterials,includingnanotubes,nanowires,nanofibers,and11precursorsdecompos
7、edinsolution,catalyzedhigh-tem-nanobeltsbecausetheyshowsomedistinctivepropertiesperaturegrowthviathevapor-liquid-solid(VLS)mecha-comparedwithbulkmaterials.1Particularly,1Dmagneticnism,12solvothermalsynthesis13anddirectelectrochemicalnanomaterialsareexpec
8、tedtohaveinterestingproperties,14precipitation.However,itremainsabigchallengetoasthegeometricaldimensionsofthematerialbecomeprepareuniformmagneticnanowiresinhighyield,anditiscomparabletokeymagneticlengthscales,suchastheals
