先進磁性材料的納米尺寸效應（21世紀科技前沿叢書先進磁性材料手冊第1卷）

《先進磁性材料的納米尺寸效應（21世紀科技前沿叢書先進磁性材料手冊第1卷）》是2005年6月23日出版的圖書，作者是劉義。

基本介紹

• 書名：先進磁性材料的納米尺寸效應（21世紀科技前沿叢書 先進磁性材料手冊 第1卷） 
• 作者：劉義
• ISBN：9787302080862
• 定價：98元
• 裝幀：圓脊紙面精裝
• 印次：1-1
• 印刷日期：2005-6-23

圖書簡介

本書的目的是對磁性材料研究的新近進展提供一種全面的理解。本書共分四卷，每一卷集中論述一個具體的研究領域。每一章首先對該章的基本概念和重要觀念進行闡述，然後從實驗和理論方面進行詳細地說明，最後介紹該領域的發展前景以及新的思想。書中提供了詳盡的參考文獻，可供研究人員參考。
近年來納米磁性材料的研究十分活躍，例如，顆粒體磁性材料的磁矯頑力隨顆粒尺寸的減小而增大，到臨界尺寸後又減小。為取得最佳磁耦和強磁體，其中的軟磁相尺寸必須小於硬磁相磁籌界厚度的兩倍。當顆粒尺寸減小到幾個納米時，量子效應必需考慮。第1卷重點闡述納米尺寸效應對磁性材料的性能影響。
本書的讀者對象為研究生和相關專業的研究人員。

目錄

1IntrinsicandExtrinsicPropertiesofAdvancedMagneticMaterials1

1.1Introduction1

1.2IntrinsicProperties3

1.2.1MagneticMoment3

1.2.2Exchange4

1.2.3MagnetizationandMagneticOrder6

1.2.4ItinerantMagnetism8

1.2.5MagneticAnisotropy10

1.3ExtrinsicProperties14

1.3.1CoherentRotation16

1.3.2DomainsandDomainWalls18

1.3.3Coercivity21

1.4MagneticMaterials25

1.4.1PermanentMagnets25

1.4.2SoftMagnets27

1.4.3RecordingMedia28

1.4.4OtherMagneticMaterials29

1.4.5Tables29

1.5MagneticNanostructures31

1.5.1PhysicalClassificationofMagneticNanostructures32

1.5.2IntrinsicPropertiesandFinite\|SizeEffects34

1.5.3Narrow\|WallandConstricted\|WallPhenomena36

1.5.4NanomagneticLocalization37

1.5.5CooperativeEffects40

1.5.6RandomAnisotropyandRemanenceEnhancement42

1.5.7MagnetizationDynamicsinNanostructures43

1.5.8Energy\|BarrierLaws47

1.6Conclusions49

Appendix1.1MagneticUnits50

References50

2MagnetisminUltrathinFilmsandBeyond58

2.1Introduction58

2.2Fabrication59

2.2.1UltrathinFilms59

2.2.2Wires61

2.2.3Dots62

2.3MagneticPropertiesinLowDimensionalSystems64

2.3.1MetastableStructures64

2.3.2DimensionalityandPhaseTransition66

2.3.3Surface/InterfaceElectronicStructure67

2.3.4QuantumSizeEffects69

2.3.5DomainsandDomainWalls71

2.4Conclusions74

References74

3ClassicalandQuantumMagnetizationReversalStudiedin

Nanometer\|SizedParticlesandClusters77

3.1Introduction77

3.2Single\|ParticleMeasurementTechniques79

3.2.1OverviewofSingle\|ParticleMeasurement

Techniques79

3.2.2Micro\|SQUIDMagnetometry81

3.3MechanismsofMagnetizationReversalatZeroKelvin82

3.3.1MagnetizationReversalbyUniformRotation

(Stoner\|WohlfarthModel)82

3.3.2NonuniformMagnetizationReversal97

3.4InfluenceofTemperatureontheMagnetizationReversal102

3.4.1Néel\|BrownModelofThermallyActivatedMagnetization

Reversal102

3.4.2ExperimentalMethodsfortheStudyoftheNéel\|Brown

Model103

3.4.3ExperimentalEvidencefortheNéel\|BrownModel106

3.5MagnetizationReversalbyQuantumTunneling112

3.5.1QuantumTunnelingofMagnetizationinMolecular

Clusters113

3.5.2QuantumTunnelingofMagnetizationinIndividualSingle\|

DomainNanoparticles116

3.5.3MagnetizationMeasurementsofIndividualSingle\|Domain

NanoparticlesandWiresatVeryLow

Temperatures118

3.5.4QuantizationoftheMagnetization120

3.6SummariesandConclusions122

References123

4MicromagneticSimulationofDynamicandThermalEffects128

4.1Introduction128

4.2MicromagneticBackground129

4.2.1EquationofMotion129

4.2.2GibbsFreeEnergy130

4.2.3LangevinEquation131

4.2.4CharacteristicLengthScales132

4.3NumericalTechniques133

4.3.1FiniteElementDiscretization133

4.3.2MagnetostaticFieldCalculation134

4.3.3TimeIntegration135

4.4NumericalExamples137

4.4.1SmallParticles137

4.4.2ThinFilmElements140

4.4.3CircularNanodots140

4.4.4MagneticNanowires142

References145

5MagneticRelaxationandQuantumTunnelingofMagnetization147

5.1Introduction147

5.2MagneticRelaxationandRelatedPhenomenainMonosized,

Non\|InteractingParticleSystems148

5.2.1Introduction148

5.2.2BlockingTemperature149

5.2.3a.c.MagneticSusceptibilityMeasurement150

5.2.4Zero\|Field\|CooledandFieldCooledMagnetization

Curves155

5.2.5MagneticHysteresisLoops158

5.2.6NumericalSimulationResults159

5.3MagneticRelaxationinParticleSystemswithSizeDistribution166

5.3.1Introduction166

5.3.2LogarithmicMagneticRelaxation167

5.4QuantumTunnelingofMagnetization171

5.4.1Introduction171

5.4.2PhysicsRelatedtoQTM172

5.4.3ObservationofQTMinSystemsofNanostructured

Materials175

5.5ConclusionsandFuturePerspectives177

References177

6NanostructuredExchange\|CoupledMagnets182

6.1Introduction182

6.2TheoryofExchange\|CoupledMagnets184

6.2.1EnergyProduct184

6.2.2FundamentalEquations186

6.2.3NucleationField188

6.2.4EnergyProduct189

6.2.5MicromagneticLocalization190

6.2.6Texture191

6.2.7EffectiveExchange192

6.3ExperimentalSystems196

6.3.1FePt\|BasedMagnets196

6.3.2Rare\|EarthCobaltMagnets207

6.3.3Nd\|Fe\|B\|BasedMagnets220

6.4Conclusions254

References255

7High\|FieldInvestigationsonExchangeCouplinginR\|FeIntermetallics

andHard/SoftNanocompositeMagnets267

7.1Introduction267

7.2ExchangeandCrystalFieldModelfor(R,R′)\|Fe\|X

System269

7.3High\|FieldMagnetization,SpinReorientationand

Magnetostrictionin(R,R′)2Fe14B271

7.3.1MagneticPhaseDiagramandSpinReorientationin

(Er1-xTbx)2Fe14B271

7.3.2MagnetostrictionandSpinReorientationin

(Er1-xTbx)2Fe14B274

7.4Exchange\|CouplinginHard/SoftNanocompositeFilms278

7.4.1MultilayerdNd2Fe14B/α\|FeFilms278

7.4.2NanodispersedNd2Fe14B/α\|FeFilms284

7.5Conclusions290

References291

8FabricationandMagneticPropertiesofNanometer\|ScaleParticle

Arrays294

8.1Introduction294

8.2FabricationofRegularlyArrangedandShapedParticles

onaNanometerScale295

8.2.1Overview295

8.2.2ScanningTunnelingMicroscopeAssistedChemical

VaporDeposition296

8.3MagneticMeasurementsonExtremelySmallParticles299

8.3.1Overview299

8.3.2HallGradiometry301

8.3.3OptimizedHallMeasurementsforParticleArrays304

8.3.4VariableFieldMagneticForceMicroscopy(MFM)in

Nanoparticles307

8.4MagnetizationProcessesinSmallParticles311

8.4.1ReversibleRotationofMagnetization311

8.4.2ModelsforMagnetizationReversalwithoutThermal

Activation316

8.4.3ExperimentalResultsonMagnetizationReversal316

8.4.4InteractionEffects317

8.4.5ComparisontoNumericalSimulations320

8.5ThermallyActivatedMagnetizationReversalinSmallParticles322

8.5.1GeneralConsiderations322

8.5.2PhenomenologicalModel323

8.5.3AngularDependenceofMagnetizationReversal327

8.5.4MagneticViscosity328

8.6Conclusions331

References331

9ProcessingandModelingofNovelNanocrystallineSoftMagnetic

Materials339

9.1Introduction339

9.2OriginofMagneticSoftness—RandomMagnetocrystalline

Anisotropy341

9.2.1MagneticAnisotropiesandMagneticSoftness341

9.2.2RandomMagnetocrystallineAnisotropy345

9.3Nanostructure\|MagneticPropertiesRelationships351

9.3.1GrainSizeandMagneticSoftness351

9.3.2IntergranularPhaseandMagneticCoupling357

9.3.3Application\|OrientedMagneticProperties360

9.4PrinciplesUnderlyingAlloyDesign364

9.4.1AlloyingElementsandAlloySystems364

9.4.2AlloyDesigninFe\|MetalBasedNanocrystalline

Alloys367

9.4.3AlloyDesigninFe\|MetalloidBasedNanocrystalline

Alloys368

9.5Prospects370

References371

Index374