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1、JournalofAlloysandCompounds429(2007)4045StudiesonmagneticaftereffectofFe3O4nano-particlesDeng-luHoua,∗,Zi-xiaDua,Cai-xiaYuea,Qing-huaLiubaDepartmentofPhysics,HebeiNormalUniversity,Shijiazhuang050016,ChinabDepartmentofPhysics,XingtaiUniversity,Xingtai054001,ChinaReceived7March2006;receivedinrevis
2、edform2April2006;accepted5April2006Availableonline24May2006AbstractThemagneticaftereffectsofFe3O4nano-particlesweresimulatedbyPreisachhysteresismodel,theresultsshowedexcellentagreementwiththeexperimentdata.Thesimulatingresultsshowedthatduetothewidedistributionofinteractionfield,magnetizationdecay
3、followedtypicallogarithmictimedependence,andthedecayoccurredmorerapidlyforfieldclosertothecoercivity.Thethermalfluctuationfieldandactivationvolumewerealsoobtained,whicharethemaincharacteristicsofthethermalfluctuationsinmagneticrecordingmedium.Fromthefactthatactivationvolumeislargerthanthemeanparticl
4、esize,wededucedthereversalmagnetizationmechanism.Onesetofparametersusedinsimulatinghysteresisloopsandmagneticaftereffectshasunifiedthehysteresisandmagneticaftereffectphenomena.Theaftereffectsunderdouble-fieldwerecalculated,andtheconditionunderwhichthetimedependenceofmagnetizationwasnon-monotonicwa
5、sgiven.©2006ElsevierB.V.Allrightsreserved.Keywords:Preisachmodel;Magneticaftereffect;Fluctuationfield;Activationvolume1.Introductioneffectestablishfoundationforimprovingthethermalstabil-ity,andpreparingnewmaterialswithhighthermalstability.Magnetite,Fe3O4,whichisahalf-metallicferrimagnetwithFromth
6、esimulating,wecangettheactivationvolumeandhighspinpolarizabilityandhighCurietemperature,playsanmakefurtherinvestigationaboutthemagnetizationandreversalimportantroleinmagnetismandmagneticmaterials.Itiswidelymagnetization.usedtomagneticrecording,deviceapplicationsbasedontun-Thethermalstabilityisus
7、uallydescribedbythetimedepen-nelingmagnetoresistance,electrophotograph,pigmentandsodenceofmagnetization,knownas,magneticaftereffect,mag-on.Duetoitssmalldiameterofparticlesandlargespecificneticrelaxationormagneticviscosity.The
