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1、NanoStmcturedMaterials,Vol.12,pp.9-12,1999ElsevierScienceLtdPergamon81999ActaMetallurgicaInc.PrintedintheUSA.Allrightsreserved0965-9773/99/$-seefrontmatterPIISO%59773(99)00056-2SIMULATIONOFTHEMAGNETICPROPERTIESDURINGTHEGROWTHOFNANOSTRUCTUREDTHINFILMSR.Brinzanikl,P.J.Jensen112,andK.H.Bennemann
2、l’InstitutfiirTheoretischePhysik,FreieUniversitatBerlinArnimallee14,D-14195Berlin,Germany2Hahn-Meitner-InstitutBerlinGlienickerStr.lOO,D-14109Berlin,GermanyAbstract--Theinteractionofatomicandmagneticstructure,aswellasthedomainformationinnanostructuredthinferromagneticfilmsisstudied.Forthispur
3、poseweuseasimplegrowthmodel,resultinginirregularlyshapedmagneticislands,andapplyrateequationsforthetemporaldevelopmentofthemagneticstructure.Theremanentmagnetizationisshownasfunctionofcoverage,temperature,andlatticeanisotropy.Amulti-domainstructu.rewithsmalldomainsisobtainedinthecaseofarapidg
4、rowthandforlowtemperatures.01999ActaMetallurgicaInc.Theinteractionoftheatomicandthemagneticstructure,whichisanimportanttopicofcurrentresearch,isespeciallystrongforverythinmagneticfilms[l].Asmallchangeofthepreparationconditionsmaychangethestructuralandthemagneticpropertiesmarkedly.Therecentpro
5、gressofexperimentalmethods(MFM,SNOM,Kerr-microscopeetc.)allowsfortheinvestigationofthesenanostructuredsystemsingreaterdetail[2,3],inparticularthespatialandtemporalmagneticdomainformation.Duetothestrongexchangecouplingsmallmagneticclustersorislandsareoftenferromagneticallyordered.Anensembleofm
6、agneticallyisolatedislandsshouldbehavesuperparamagnetically[4].However,magneticanisotropiesmayhindertherelaxationtowardstheequilibriumstatefortemperaturesbelowtheso-calledblockingtemperature,whichdependsonthestrengthoftheanisotropy,theislandsize,andthemeasuringtime.Theresultingmagneticstructu
7、remaybenotthemostfavorablesingle-domainstate,butsticksinametastablemulti-domainstatewithavanishingremanentmagnetization.Thisfeatureisobservedifthemagneticfilmispreparedinzeroappliedmagneticfield[2].Inthisstudywepresentresultsfortheremanentmag
