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1、8:07f=WðJul162004ÞMAGMA:53278Prod:Type:FTPED:AnupamaDeviYþmodelpp:124ðcol:fig::NILÞPAGN:VGSCAN:ARTICLEINPRESS13JournalofMagnetismandMagneticMaterials](]]]])]]]–]]]www.elsevier.com/locate/jmmm57Synthesisandinvestigationofmagneticpropertiesofsubstitutedferr
2、ite9nanoparticlesofspinelsystemMn1xZnx[Fe2yLy]O411a,b,bTatianaN.Brusentsova,ViatcheslavD.Kuznetsov13aDepartmentofPhysics,UniversityofCentralFlorida,32816Orlando,FL,USAbDepartmentofPhysics,MendeleyevUniversityofChemicalTechnologyofRussia,125047Moscow,Ru
3、ssia1517Abstract193+3+3+3+Superparamagneticnanoparticlesofthespinelferritefour-elementsystemMn1xZnx[Fe2yLy]O4(whereL:Gd,La,Ce,Eu,213+3+3+Dy,Er,Yb)weresynthesizedbytheco-precipitationmethod.Themagneticmomentsofthe10nmdiameternanoparticleswerecomparableto
4、theonesofFe3O4nanoparticles.AcomparativelylowTC(52–721C)wasobservedforsomeofthecompositions.The23heatingmechanismofthesuperparamagneticparticlesintheACmagneticfieldatradiofrequencyrangeisdiscussedandespeciallytheabsenceofthehysteresisloopintheM–Hcurveatro
5、omtemperature.Onepossibleexplanation—spontaneousparticleagglomeration—25wasexperimentallyverified.r2006PublishedbyElsevierB.V.27Keywords:Superparamagneticparticle;Ferrite;Magneticproperty;Curietemperature;Hysteresis;HeatinginACfield291.IntroductionTCrange52
6、–721Candamagneticmomentthatwas5931sufficientlyhightoachieveasatisfactoryheatingrateintheSuperparamagneticparticlesofthespinelferritesystemACfieldat0.88MHz,7.3kA/m,0.15kWupto1.71C/mg61333+3+3+Mn1xZnx[Fe2yLy]O4(whereL:Gd,La,Ce,ferritemin.Eu3+,Dy3+,Er3+,Yb3+
7、)maybesynthesizedintheeasiestAlsoasweconsiderthenano-scalematerial,thereare6335way,bychemicalco-precipitationmethod.Andthepointstillsomepointsintheheatingmechanismatthelow-ofviewthisfour-elementferritesystemmaybeinterestingfrequency(o1MHz)ACfieldthatneedmo
8、reunder-6537isthatthere’sanopportunityforalargespectraofthestandings,i.e.itneedstobeverifiedwhethertheremanencevariationsofmagneticpropertiesthatwillgaintheandcoercivityofananoparticlearereallyaslowasthe6739nanoparti
