简介：Theworldhasbecomehighlydependentonreliablerefrigerationtechnology.Withoutit,ourfoodsupplywouldbestillseasonalandlimitedtolocallyproducednonperishableitems;comfortablelivingconditionsviaclimatecontrolwouldbeimpossible;andcertainmedicaladvancements,e.g.MRIdiagnostics,organtransplantation,organandtissuecryo-storage,andcryo-surgerywouldbeimpossible.

简介：Ininversemicroemulsion,rareearthferrite/polyacrylamidemagneticmicrospherewerepreparedandtheirmagneticresponsibilitywerestudiedbymagneticbalance.Resultsindicatethatthemagneticresponsibilityofmicrosphererelatestomagneticmomentofrareearthion,anditcanbeimprovedbytheadditionofdysprosiumionofhighmagneticmoment.Dysprosiumcontenthasaneffectonmagneticresponsibilityofdysprosiumferrite/polyacrylamidemagneticmicrosphere.ThemicrospheredisplaysstrongmagneticresponsibilitywhenthemolarratioofDy3+/ironis0.20.

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简介：ThepolycrystallinesamplesofLa2/3Ca1/3MnO3werepreparedbyaconventionalsolidstatereactionmethod.Themagnetizations(ZFC,FCandinitialmagnetization)ofthepolycrystallineLa2/3Ca1/3MnO3weremeasuredwithsuperconductingquantuminterferencedevicemagnetometer.Thescalingtheorywasemployedtostudythechangesofcriticalbehaviorarisingfromtheappliedexternalfield.Thecriticalparameterβdecreaseswithincreasingtheexternalmagneticfieldresultsinanincreaseinthemagnitudeofferromagneticordering.

简介：ThestructureandintrinsicmagneticpropertiesofRFeM（M=VorTi）,type1:12,havebeenstudiedbymagneticmeasurementandX-raydiffraction.Theyarebody-centeredtetragonalThMn12structure.Thechangesofcrystallatticeconstantscoincidewiththatoftheirelementradii.Curietemperatureisdecidedmainlybytheexchangeinteractionsof3d-3dand3d-4fatompairs.Thedataobtainedbymean-fieldapproximationagreewellwithexperimentalvalues.ThemagneticmomentcouplinginthesecompoundsforLREisferromagnetic,andforHREisantiferromagnetic.Atlowtemperature,anisotropyfieldisdecidedbyREsublattice.Inthispaper,theinfluenceofmagneticpropertiesofcobaltandnickelreplacingironhasalsobeenstudied.

简介：Aseriesofnanocompositethinfilms,composedofNd2Fe14Bandα-Fe,hasbeenpreparedbyDC-magnetronsputteringcombinedionbeamsputteringontoSi(100)substrates.Theeffectsofpostannealingonthemicrostructureandmagneticpropertiesof[NdFeB/α-Fe/NdFeB]-typethinfilmshavebeeninvestigated.TheX-raydiffraction(XRD)studyshowedthatannealingofthefilmsfor30minattemperatures550,600,650,700℃resultedintheappearanceofdiffractionpeaks,characteristicforNd2Fe14Btetragonalstructure,α-FeandNd2O3phases.TheinvestigationusingtheVibratingSampleMagnetometer(VSM)withamaximumappliedfieldof2Tindicatedthatwiththeincreaseoftheannealingtemperature,themagneticpropertiesofthemultilayerfilmswereimprovedandreachedpeakvalueat650℃(Hci=41.72kA·m-1,Mr/Ms=0.4,(BH)max=30.35kJ·m-3),afterwhichthemagneticpropertiesweredecreasedgreatly.Alongwiththeincreaseofthethicknessofα-FelayerfromTα-Fe>16nm,thecoercivityHci,saturationmagnetizationMs,andremanenceratioMr/Msalldeclined.AstheAtomicForceMicroscope(AFM)indicated,afterbeingannealedat650℃for30min,thesamplewasshowedfinesurfacemorphologywithgrainsize60nm≤dα-Fe≤80nmand100nm≤dNdFeB≤150nm.

简介：Terfenol-D杆是否应该被把压成薄片，具有在为动态应用设计一个magnetostrictive致动器的开始的担心。迭合能减少旋涡水流损失，而且减少GMM杆的僵硬。常规方法由是复杂的女性(有限元素的方法)或一个的经验。在这篇文章，在杆的剖面图的磁场分发的一条分析途径被描述，并且如果Terfenol-D杆应该被把压成薄片，它作为一个参考方法被介绍给法官。数字评估和试验性的结果证明了途径的合理性和可获得性。

简介：ThemeasurementsoftemperaturedependenceofthemagneticsusceptibilityofLa1-xSrxCoO3perovskiteoxidesatdifferentSrdoping(0≤x≤0.5)andannealingtemperaturewerepresented.Forthesamplewithx=0.1,ashoulderwasobservedaround150K,andapeakwhichisonefeatureofspinglassappearedaround50Kinthecurveofsusceptibilityversustemperature.Thehigh-temperature(250～420K)susceptibilityfitswellwithCurie-Weisslawforallsamples.WeissconstantandeffectivemagneticmomentweredeterminedandtheirvariationswithSrdopingandoxygenannealingconditionwereobtained.TheWeissconstantincreasesmonotonouslywithSrcontentforx>0.2.Thevaluesofeffectivemomentswereinterpretedwiththespinstateofcobaltions.Studiesonthesusceptibilitiesofthesampleswithx=0.2underdifferentpreparationtemperaturesandannealingtemperaturesshowthattherisingofsinteringtemperatureandannealingtemperaturewillincreasethepara-ferromagnetictransitiontemperature,andreducetheeffectivemomenttonormalvalue.OurresultshowsthatbothCo3+andCo4+ionsshouldbeinISstateafterannealingandtheoxygenannealingcausesthetransitionofCo3+spinstatefromHStoIS.

简介：在这份报纸，有石墨(C)或碳nanotubes(CNT)的增加的SmCo6.9Hf0.1当演员组合金和带子被融化的弧和融化旋转分别地准备。补充说结构和磁性SmCo6.9Hf0.1上的碳借助于X光检查衍射(XRD)被调查的效果，扫描电子显微镜学(SEM)，传播电子显微镜学(TEM)，磁性的力量显微镜学(MFM)和颤动的样品磁强计(VSM)。尽管他们的水晶结构作为一样的Sm被描绘，微观结构和SmCo6.9Hf0.1带子的磁性的结构由于C或CNT的介绍显然被改变，这被发现尽管他们的水晶结构作为一样的Sm被描绘(公司，Hf)7单个阶段，不管碳被增加。作为结果，包含碳的带子的磁性在某个度被提高。这被认为与精制equiaxed谷物，小领域尺寸和C或CNTs富有的区域的卡住的效果有关。SmCo6.9Hf0.1(CNT)的磁性0.05条带子到达了Hc=12.5kOe，Mr=57.0emu/g和Mr/M2T=0.788。

简介：InordertoimproveandstabilizethemagneticpropertiesofnanocompositeNd2Fe14B/α-Femagneticalloysbyacompositionaladjustment,smallamountofDyand/orCowasaddedtoNd9Fe84B7alloys.DTAanalysisontheamorphousofthealloystookplaceasthesoftmagneticphaseswerecrystallized,andthenthehardmagneticNd2Fe14Bwasprecipitatedfromthem.Whileα-Feandametastable1:7(TbCu7-type)phasewereformedsimultaneouslyinDyandCo-freealloys,theywerecrystallizedseparatelyatdifferenttemperaturesafterDyorCowasadded.ThisphaseseparationoccurredmoreclearlyintheDy-treatedalloysandtheothersoftmagneticphaseFe3BwasalsostabilizedbyDyand/orCo.The1:7phasethatwasstabilizedbyDyand/orCowasnoteliminatedat700℃,decreasingmagneticpropertiesofthealloys.Itwaseventuallydisappearedabove725℃,butFe3Bwasnoteliminatedevenat750℃whenDywasaddedmorethan0.5at%orCowasaddedmorethan2.0at%.AmountofNd2Fe14BinthealloystendedtoincreaseasDyadditionincreased,whereasCoadditiondidnotleadtoanyappreciablechangeintheratioofα-FeandNd2Fe14B.Moreover,DyadditionapparentlyincreasedcoercivityofanalloywhileCoadditionhadabeneficialeffectonremanence.ThegrainsintheDytreatedalloyswereusuallyfinerthanthoseintheCo-treatedalloys.Thegrainsizeofbothα-FeandNd2Fe14Binthealloysexhibitingmr≥0.72wasintherangeof20～40nmorevenlarger50nm,whichislargerthanthetheoreticaloptimumsize(～10nm).TypicalmagneticpropertiesobtainedfromaNd7.5Dy1.5Fe82.5Co1.5B7alloyannealedfor12minat725℃wereiHc=4.85kOe,Br=11.32kG,(BH)max=15.73MGOe,andmr=0.73.

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简介：形成，磁性和微观结构上的公司替换和退火的处理的效果(NdDyTb)12.3(FeZrNbCu)快速的熄灭并且随后的退火准备的81.7-xCoxB6(x=015)带子系统地借助于微分扫描热量计(DSC)被调查，X光检查衍射(XRD)，扫描电子显微镜学(HRSEM)和颤动的样品磁强计(VSM)的高分辨率。阶段分析揭示了单相的材料。顽磁极化Jr和最大与从0～12增加x增加了然后为x=15减少了的最大的精力产品(BH)。内在的coercivityHci(NdDyTb)12.3(FeZrNbCu)最佳地处理的81.7xCoxB6带子为x=15为x=0从1308.7kA/m减少了到817.4kA/m。有Jr=1.041T的最佳磁性，Hci=944.9kA/m并且(BH)max=155.1kJ/m3被退火完成在675吠敨琠牥業慮?桴潩?牧畯獰?的融化旋转带子(x=12)??湩琠敨?呐?偍????敷敲椠?楳畴漠楸楤敺?湩潴猠汵潦楮?捡摩朠潲灵?匨??琠？？

简介：ThemagneticpropertiesandthephasestructureofTb1-xPrxFe1.96(x=0,0.1,...,0.7)werestudied.ItisfoundthatthesaturationmagnetizationoneasyaxisisdecreasedwithincreaseofPrcon-tent,from77.24Am^2·kg^-1forx=0,reducestominimumvalueof11.84Am^2·kg^-1forx=0.5,andreturnesto37.14Am^2·kg^-1forx=0.7.Thenon-cu-bicphasesappearbeyondx=0.2andthematrixchangesfrom1:2phaseforx=0to1:3phaseforx=0.4,atlastto2:17phaseforx=0.7.Thecom-poundsstructurewouldturnmorecomplexasthePrcontentincreases.

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简介：有TbCu7结构的SmCo6.6Nb0.4nanoflakes被帮助表面活化剂的高精力球milling(SA-HEBM)成功地作为milling媒介与heptane和油的酸准备。微观结构，水晶结构和磁性被分别地扫描电子显微镜学，X光检查衍射，和颤动的样品磁强计学习。nanoflakes的结晶的排列和coercivity系统地被调查的c轴上的球milling时间的效果。研究证明nanoflakes有100nm的平均厚度，1m的一条平均直径，与象100一样高的方面比率。作为时间从2～8h增加了的球milling，思考达到顶点紧张比率我(002)/I(101)显示了SmCo6.6Nb0.4阶段的c轴水晶质地的度，增加了第一，在4h到达了一座山峰，然后减少。同时，nanoflakes的coercivity也增加了第一，为4h在13.86kOe到达了一座山峰，然后减少。

简介：ThecompoundSm0.98Fe9.02–xGaxNδ(x=0,0.25,0.5,0.75,1)werepreparedbymelt-spunmethodandsubsequentannealingandnitriding.TheRietveldanalysisshowedthatthelatticeexpansionplayedanimportantroleinimprovingtheCurietemperature.AnobviousdevelopmentoftheCurietemperaturewasobtainedwiththeincreasedGacontentfromx=0–1(ΔTc=90oC).Theoptimumcoercivityofnitrideswasobtainedatx=0.25withthevalueHcj=652kA/m(8.15kOe)afterannealing,whichcorrespondedtoareasonabledistributionofgrainsizesofbothTbCu7-typeSmFe9Nδandα-Fe.However,anexcessofGadopingmightleadtoanabnormalgrowthofα-Fe,whichinturndeterioratedthemagneticproperties.ItwasconcludedthatamoderateGacontentwasveryeffectiveinraisingthecoercivityandCurietemperamentintheTbCu7-typeSm-Fe-N.

简介：La公司代替了M类型钡铁酸盐(欺骗)由传统的稳固的状态被准备在低温度(1173K)的方法和sintered。X光检查衍射(XRD)，扫描电子显微镜学(SEM)和颤动的样品磁强计(VSM)被采用在样品的结构和磁性上调查La公司的影响。由在为在空中的6h的1173K的sintering，有Ba(LaCo)xFe122xO19(x=0.00.5)的化学作文的单个阶段M类型钡铁酸盐被形成。M-H曲线证明钡铁酸盐的磁性被La公司替换显然完成。浸透磁化(女士)和coercivity(Hc)分别地到达了65.15Am2/kg和4165Oe的最大的价值。这行为被归因于La公司替换和粒子尺寸的地点。SEM表明铁酸盐粒子的形状被La公司替换影响。

简介：TheNd60Fe20Al8Co10B2alloywaspreparedbysuctioncastingofthemoltenalloyintoacoppermoldunderargonatmosphere.Themicro-structuralandmagneticpropertychangesintheNd60Fe20Al8Co10B2alloyduringcrystallizationwereinvestigatedbyX-raydiffraction(XRD),differentialscanningcalorimetry(DSC),scanningelectronmicroscope(SEM)andthevibratingsamplemagnetometer(VSM).TheprecipitationandNd-richandFe-richphaseshavenosignificanteffectontheintrinsiccoercitityforNd60Fe20Al8Co10B2alloyannealedbelow723K.However,thegrowthofFe-richphasedecreasesthesaturatemagnetizationandremanenceofthealloy.Thehardmagneticbehaviorisdisappearedwhenthealloyisfullycrystallized.

简介：EffectsofNbandZrsubstitutionsonthecrystal]izationbehaviorsandmagneticpropertiesofmelt-spun(Nd,Pr)2Fe14B/α-Fealloyswerestudied.Theresultsshowthatfor(Nd0.4Pr0.6)8.5Fe85.5B6ribbons,themetastable(Nd,Pr)3Fe62B14precipitatesaftertheinitialcrystallizationofα-Feanddecomposesintothefinalmixtureof(Nd,Pr)2Fe14Bandα-Fe.For(Nd0.4Pr0.6)8.5Fe84.5Zr0.5Nb0.5B6ribbons,however,(Nd,Pr)2Fe14Bandα-Fephasesprecipitatesimultaneously.ThisindicatesthatbothNbandZrdopingcanavoidtheformationofmetastablephaseand!

简介：EffectofMnsubstitutionforFeincubicLavesZr0.1Tb0.9(Fe1-xMnx)2andY0.1Tb0.9(Fe1-xMnx)2com-poundsispresented.Similarresultsinbothsystemsareobtained:ThestructureandthemagnetismofTbFe2arebothinfluencedslightlybyasmallamountofYorZrsubstitutionforTb;Withincreasingxvalue,thelatticeconstantincreasesmonotonously;theCurietemperaturedecreaseslinearly;whilesaturationmagnetizationincreaseslinearly.ForthesmallamountofMnsubstitutionforFeinbothsystems,magnetostrictionissignificantlylargerthanthatinthepureironalloys.Thelargestmagnetostrictionof|γ‖-|γ|=2200×10-6atmagneticfieldof2×107/4πA/misobtainedforY0.1Tb0.9(Fe0.95Mn0.052.