Advances in Nanoscale Magnetism (eBook)

Preface 6
Contents 10
1 Role of Defects and Disorder in the Half- Metallic Full- Heusler Compounds 16
1.1 Introduction 16
1.2 Defects in Full-Heuslers Containing Co and Mn 18
1.3 Defects Driven Half-Metallic Ferrimagnetism 22
1.4 A Possible Route to Half- Metallic Antiferromagnetism 26
1.5 Vacancies 28
1.6 Summary and Outlook 29
References 31
2 Clustering in Heusler Alloys 35
2.1 Introduction 35
2.2 Experimental Methods 38
2.3 Results and Discussion 38
References 48
3 Anisotropy of Ferromagnetic Heusler Alloys Thin Films 50
3.1 Introduction 50
3.2 The Theory of Ferromagnetic Resonance 55
3.3 Introduction 63
3.4 Conclusions 75
References 77
4 Quantum Monte Carlo Study of Anderson Magnetic Impurities in Semiconductors 79
4.1 Introduction 79
4.2 Model 81
4.3 Two-Dimensional Case 83
4.4 Three-Dimensional Case 91
4.5 Tight-Binding Model for a Mn d Orbital in GaAs 94
4.6 Discussion and Summary 96
References 98
5 New Type of Nanomaterials: Doped Magnetic Semiconductors Contained Ferrons, Antiferrons and Afmons 100
5.1 Introduction 100
5.2 Ferrons 101
References 121
6 Cerium-Doped Yttrium Iron Garnet Thin Films Prepared by Sol- Gel Process: Synthesis, Characterization, and Magnetic Properties 123
Abbreviations 123
6.1 Introduction 124
6.2 Experimental Details 127
6.3 Results and Discussion 130
6.4 Summary and Conclusions 137
References 138
7 Tuning the Magnetic and Electronic Properties of Manganite Thin Films by Epitaxial Strain 140
7.1 Introduction 140
7.2 Preparation and Analysis of Films 144
7.3 Structural Characterization, Electrical and Magnetic Properties of Manganites Film 147
7.4 General Discussion 153
7.5 Conclusions 155
References 155
8 Radiation Nanostructuring of Magnetic Crystals 157
8.1 Introduction 157
8.2 The Influence of Inhomogeneities upon the Properties of Ferrites and Ferrite Devices 158
8.3 Wave-Front Reversal in a Medium with Inhomogeneities 159
8.4 Experimental Results 161
8.5 Discussions 167
8.6 Conclusions 172
References 173
9 Electromagnetic Radiation of Micro and Nanomagnetic Structures with Magnetic Reversal 174
9.1 Introduction 174
9.2 Experimental 175
9.3 Results and Discussion 177
9.4 Conclusions 187
References 188
10 Structural and Magnetic Properties and Preparation Techniques of Nanosized M- type Hexaferrite Powders 189
10.1 Introduction 189
10.2 Crystalline Structure 190
10.3 Magnetic Properties 192
10.4 Methods for Preparation 198
10.5 Microemulsion Technique 202
References 205
11 Nanocrystallization and Surface Magnetic Structure of Ferromagnetic Ribbons and Microwires 210
11.1 Introduction 210
11.2 Co-Rich Ribbons 211
11.3 Ni-Rich Ribbons 215
11.4 Microwires with Novel Composition Cu70(Co70Fe5Si10B15)30 217
References 222
12 On Structural and Magnetic Propertiesof Fe73.5 xSi13.5B9Cu1Nb3Mnx Metal Alloys 223
12.1 Introduction 223
12.2 Experiment 224
12.3 Results and Discussion 224
12.4 Conclusions 233
References 234
13 FeCoZr– Al2O3 Granular Nanocomposite Films with Tailored Structural, Electric, Magnetotransport and Magnetic Properties 235
13.1 Introduction 235
13.2 Properties of FeCoZr– Al2O3 Nanocomposite Films: Synthesis in Pure Ar and Mixed Ar + O Ambient 247
13.3 Concluding Remarks 265
References 267
14 Ferromagnetism of Nanostructures Consisting of Ferromagnetic Granules with Dipolar Magnetic Interaction 272
14.1 Introduction 272
14.2 Lattices of Point-like and Rod-like Ferromagnetic Granules with Dipole Interaction 276
14.3 Lattices of Ellipsoidal Granules with Dipole Interaction 283
14.4 Partially Populated Lattices of Point- Like Ising Dipoles 290
14.5 Random Systems of Point-Like and Rod- Like Ising Dipoles 298
14.6 Experimental Examples 314
References 321
15 Magnetic Dipolar Interactions in Nanoparticle Systems: Theory, Simulations and Ferromagnetic Resonance 323
15.1 Introduction 323
15.2 Theory of Dipole – Dipole Interactions in Magnetic Nanoparticles 324
15.3 Ferromagnetic Resonance in Magnetic Nanoparticles 327
15.4 Conclusions 328
References 328
Contributors 329