Advances in Nanoscale Magentism

by Aktas, Bekir; Mikailov, Faik

ISBN13: 9783540698814

ISBN10: 3540698817

Format: Hardcover

Pub. Date: 2009-02-28

Publisher(s): Springer Verlag

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Summary

The book aims to provide an overview of recent progress in the understanding of magnetic properties in nanoscale through recent results of various theoretical and experimental investigations. The papers describe a wide range of physical aspects, together with theoretical and experimental methods. It is of central interest to researchers and specialists in magnetism and magnetic materials science, both in academic and industrial research, as well as advanced students. Book jacket.

Role of Defects and Disorder in the Half-Metallic Full-Heusler Compounds	p. 1
Introduction	p. 1
Defects in Full-Heuslers Containing Co and Mn	p. 3
Defects Driven Half-Metallic Ferrimagnetism	p. 7
A Possible Route to Half-Metallic Antiferromagnetism	p. 11
Vacancies	p. 13
Summary and Outlook	p. 14
References	p. 16
Clustering in Heusler Alloys	p. 21
Introduction	p. 21
Experimental Methods	p. 24
Results and Discussion	p. 24
X-Ray Diffraction Studies	p. 24
Mossbauer Studies	p. 28
DC Magnetization Studies	p. 31
References	p. 34
Anisotropy of Ferromagnetic Heusler Alloys Thin Films	p. 37
Introduction	p. 37
TMR and GMR Effects	p. 38
Critical Current	p. 39
Theoretical Background	p. 41
The Theory of Ferromagnetic Resonance	p. 42
Dynamics of Magnetization	p. 42
Resonance Field for Polycrystalline Film	p. 44
Ferromagnetic Resonance in Single Crystalline Film	p. 45
Line-Width of Resonance Absorption	p. 47
Introduction	p. 50
Sample Preparation	p. 50
Magnetic Characterizations	p. 53
FMR Results	p. 55
Conclusions	p. 62
References	p. 64
Quantum Monte Carlo Study of Anderson Magnetic Impurities in Semiconductors	p. 67
Introduction	p. 67
Model	p. 69
Two-Dimensional Case	p. 71
Magnetic Correlations Between the Impurities	p. 71
Impurity-Host Correlations	p. 76
Three-Dimensional Case	p. 79
Tight-Binding Model for a Mn d Orbital in GaAs	p. 82
Discussion and Summary	p. 84
References	p. 86
New Type of Nanomaterials: Doped Magnetic Semiconductors Contained Ferrons, Antiferrons, and Afmons	p. 89
Introduction	p. 89
Ferrons	p. 90
Giant Red Shift of Fundamental Absorption Edge Connected with Ferromagnetic Ordering	p. 90
Notion of Ferrons	p. 92
Electrical Resistivity and Magnetoresistance of Nondegenerate Ferromagnetic Semiconducrors with n-Type of Electrical Conductivity	p. 94
Magnetic Two-Phase Ferromagnetic-Antiferromagnetic State in Manganites	p. 99
Antiferrons	p. 103
Afmons	p. 108
References	p. 110
Cerium-Doped Yttrium Iron Garnet Thin Films Prepared by Sol-Gel Process: Synthesis, Characterization, and Magnetic Properties	p. 113
Introduction	p. 114
Experimental Details	p. 117
Results and Discussion	p. 126
Summary and Conclusions	p. 127
References	p. 128
Tuning the Magnetic and Electronic Properties of Manganite Thin Films by Epitaxial Strain	p. 131
Introduction	p. 131
Preparation and Analysis of Films	p. 135
Deposition Technique and Film Growth	p. 135
Analysis of Films	p. 137
Structural Characterization, Electrical and Magnetic Properties of Manganites Film	p. 138
Structural Characterization	p. 138
Magnetic Properties	p. 139
Electrical Properties	p. 142
General Discussion	p. 144
Conclusions	p. 146
References	p. 146
Radiation Nanostructuring of Magnetic Crystals	p. 149
Introduction	p. 149
The Influence of Inhomogeneities upon the Properties of Ferrites and Ferrite Devices	p. 150
Wave-Front Reversal in a Medium with Inhomogeneities	p. 151
Experimental Results	p. 153
Discussions	p. 159
Conclusions	p. 164
References	p. 165
Electromagnetic Radiation of Micro and Nanomagnetic Structures with Magnetic Reversal	p. 167
Introduction	p. 167
Experimental	p. 168
Results and Discussion	p. 170
Coercivity Static Measurements of Magnetic Patterned Media	p. 170
The Dependence of the Amplitude and Duration of Emitted Signal on the External Magnetic Field Amplitude	p. 173
Experimental Determination of Dynamic Emitted Parameters of Magnetic Patterned Media	p. 174
Dependence of Dynamical Coercivity of Bit Arrays with Underlayer on the Bits Structural Geometry	p. 176
Peculiarities of the Magnetic Structure of Cobalt Bits with and without a Soft Magnetic Underlayer	p. 177
Conclusions	p. 180
References	p. 181
Structural and Magnetic Properties and Preparation Techniques of Nanosized M-type Hexaferrite Powders	p. 183
Introduction	p. 183
Crystalline Structure	p. 184
Magnetic Properties	p. 186
Methods for Preparation	p. 192
Microemulsion Technique	p. 196
References	p. 199
Nanocrystallization and Surface Magnetic Structure of Ferromagnetic Ribbons and Microwires	p. 205
Introduction	p. 205
Co-Rich Ribbons	p. 206
Experimental Details	p. 206
Results and Discussion	p. 207
Ni-Rich Ribbons	p. 210
XRD and AFM Structural Results	p. 210
Magnetic Results	p. 210
Microwires with Novel Composition Cu[subscript 70](Co[subscript 70]Fe[subscript 5]Si[subscript 10]B[subscript 15])[subscript 30]	p. 212
Experimental Details	p. 213
Results and Discussion	p. 213
References	p. 217
On Structural and Magnetic Properties of Fe[subscript 73.5-x]Si[subscript 13.5]B[subscript 9]Cu[subscript 1]Nb[subscript 3]Mn[subscript x] Metal Alloys	p. 219
Introduction	p. 219
Experiment	p. 220
Results and Discussion	p. 220
As-Quenched Fe[subscript 73.5-x]Si[subscript 13.5]B[subscript 9]Cu[subscript 1]Nb[subscript 3]Mn[subscript x]	p. 220
Annealed Fe[subscript 73.5-x]Si[subscript 13.5]B[subscript 9]Cu[subscript 1]Nb[subscript 3]Mn[subscript x]	p. 224
Conclusions	p. 229
References	p. 230
FeCoZr-Al[subscript 2]O[subscript 3] Granular Nanocomposite Films with Tailored Structural, Electric, Magnetotransport and Magnetic Properties	p. 231
Introduction	p. 231
Granular Nanocomposites for Electronics: Reasons of Interest	p. 232
Preparation and Structure of Granular MMCs	p. 233
Percolation in Granular Nanocomposites	p. 235
Carrier Transport in Granular MMCs around Metal-Insulator Transition	p. 237
Magnetic Properties of Granular Nanocomposites	p. 242
Properties of FeCoZr-Al[subscript 2]O[subscript 3] Nanocomposite Films: Synthesis in Pure Ar and Mixed Ar + O Ambient	p. 243
Synthesis and Samples Preparation	p. 243
Mossbauer Spectroscopy	p. 244
Alternation Grads- and SQUID-Magnetometry	p. 246
Atomic Force-Magnetic Force Microscopy	p. 249
Electric and Magnetotransport Properties	p. 253
Concluding Remarks	p. 261
References	p. 263
Ferromagnetism of Nanostructures Consisting of Ferromagnetic Granules with Dipolar Magnetic Interaction	p. 269
Introduction	p. 269
Lattices of Point-like and Rod-like Ferromagnetic Granules with Dipole Interaction	p. 273
3D Lattice of Point-Like Granules	p. 275
2D Lattice of Point-Like Granules	p. 277
3D Lattice of Rod-Like Granules	p. 279
2D Lattice of Rod-Like Granules	p. 279
Lattices of Ellipsoidal Granules with Dipole Interaction	p. 280
Magnetic Field of the Ellipsoidal Granule	p. 280
3D Lattice of Ellipsoidal Granules	p. 282
2D Lattice of Prolate Ellipsoidal Granules	p. 282
2D Lattice with Oblate Ellipsoidal Granules	p. 284
2D Lattice of Oblate Ellipsoidal Granules in a Magnetic Field	p. 285
Partially Populated Lattices of Point-Like Ising Dipoles	p. 287
Distribution of Local Magnetic Fields	p. 288
Magnetic Phase Diagram	p. 290
Random Systems of Point-Like and Rod-Like Ising Dipoles	p. 295
Introduction	p. 295
Generalized Mean Field Theory for Point (Spherical) Dipoles	p. 296
Generalized Mean Field Theory for Rod-Like Dipoles	p. 303
Magnetic Properties of a Random System of Rod-Like Dipoles	p. 308
Experimental Examples	p. 311
Magnetism of Ultrathin Films	p. 311
2D Lattices of Disk-Shaped Granules in a Magnetic Field	p. 314
Magnetic Recording Density	p. 314
Conclusions	p. 318
References	p. 318
Magnetic Dipolar Interactions in Nanoparticle Systems: Theory, Simulations and Ferromagnetic Resonance	p. 321
Introduction	p. 321
Theory of Dipole - Dipole Interactions in Magnetic Nanoparticles	p. 322
Dipolar Interactions	p. 322
Simulations for Arrays of Nanoparticles	p. 323
Ferromagnetic Resonance in Magnetic Nanoparticles	p. 325
Conclusions	p. 326
References	p. 326
Contributors	p. 327
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