Advances in nanoscale magnetism : proceedings of the International Conference on Nanoscale ICNM-2007, June 25 -29, Istanbul, Turkey Magnetism ICNM-2007, June 25-29, Istanbul, Turkey

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Cover image for Advances in nanoscale magnetism : proceedings of the International Conference on Nanoscale ICNM-2007, June 25 -29, Istanbul, Turkey Magnetism ICNM-2007, June 25-29, Istanbul, Turkey

Title:

Conference Author:

International Conference on Nanoscale Magnetism (4th : 2007 : Istanbul, Turkey)

Series:

Springer proceedings in physics ; 122

Publication Information:

Berlin : Springer, 2009

Physical Description:

xiv, 328 p. : ill. ; 24 cm.

ISBN:

9783540698814

Subject Term:

Magnetism -- Congresses

Nanostructured materials -- Magnetic properties -- Congresses

Added Author:

Aktas, Bekir

Mikailov, Faik

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Library	Item Barcode	Call Number	Material Type	Item Category 1	Status
Searching... PSZ JB	30000010194228	QC753.2 I57 2009	Open Access Book	Book	Searching... Unknown

Intensive investigations on nanoscale magnetism have promoted remarkable progressintechnologicalapplicationsofmagnetisminvariousareas.Thete- nical progress of recent years in the preparations of multilayer thin ?lms and nanowires led to the discovery of Giant Magnetoresistance (GMR), imp- ing an extraordinary change in the resistivity of the material by varying the applied external magnetic ?eld. The Nobel Prize for Physics in 2007 was awardedtoAlbertFertandPeterGrun ] bergfortheirdiscoveryofGMR.App- cations of this phenomenon have revolutionizedtechniques for retrieving data fromharddisks.Thediscoveryalsoplaysamajorroleinvariousmagnetics- sors as well as the development of a new generation of electronics. The use of GMRcanberegardedasoneofthe'rstmajorapplicationsofnanotechnology. The GMR materials have already found applications as sensors of low magnetic ?eld, a key component of computer hard disk heads, magnetores- tive RAM chips etc. The "read" heads for magnetic hard disk drives have allowed us to increase the storage density on a disk drive from 1 to 20 Gbit per square inch, merely by the incorporation of the new GMR materials. On the other hand, recently discovered giant magneto-impedance (GMI) mate- als look very promising in the development of a new generation of microwave band electronic devices (such as switches, attenuators, and antennas) which could be managed electrically.

I. Galanakis and K. Ozdogan and E. SasiogluN. Lakshmi and V. Sebastian and K. VenugopalanR. Yilgin and B. AktasN. Bulut and Y. Tomoda and K. Tanikawa and S. Takahashi and S. MaekawaL.I. Koroleva and D.M. ZashchirinskiiY. Ozturk and I. Avgin and M. Erol and E. CelikG.H. Aydogdu and Y. Kuru and H.-U. HabermeierV.A. Ageev and V.I. Kirischuk and Yu.V. Koblyanskiy and G.A. Melkov and L.V. Sadovnikov and A.N. Slavin and N.V. Strilchuk and V.I. Vasyuchka and V.A. ZheltonozhskyB.A. Gurovich and K.E. Prikhodko and E.A. Kuleshova and A.G. Domantovsky and K.I. Maslakov and E.Z. MeilikhovT. Koutzarova and S. Kolev and C. Ghelev and K. Grigorov and I. NedkovA. Chizhik and A. Zhukov and V. Zhukova and C. Garcia and J.M. Blanco and J.J. del Val and L. Fernandez and N. Iturriza and J. GonzalezR. Brzozowski and M. Wasiak and P. Sovak and M. MonetaJ.A. FedotovaE. Meilikhov and R. FarzetdinovaD.S. Schmool and M. Schmalzl

1 Role of Defects and Disorder in the Half-Metallic Full-Heusler Compounds	p. 1
1.1 Introduction	p. 1
1.2 Defects in Full-Heuslers Containing Co and Mn	p. 3
1.3 Defects Driven Half-Metallic Ferrimagnetism	p. 7
1.4 A Possible Route to Half-Metallic Antiferromagnetism	p. 11
1.5 Vacancies	p. 13
1.6 Summary and Outlook	p. 14
References	p. 16
2 Clustering in Heusler Alloys	p. 21
2.1 Introduction	p. 21
2.2 Experimental Methods	p. 24
2.3 Results and Discussion	p. 24
2.3.1 X-Ray Diffraction Studies	p. 24
2.3.2 Mossbauer Studies	p. 28
2.3.3 DC Magnetization Studies	p. 31
References	p. 34
3 Anisotropy of Ferromagnetic Heusler Alloys Thin Films	p. 37
3.1 Introduction	p. 37
3.1.1 TMR and GMR Effects	p. 38
3.1.2 Critical Current	p. 39
3.1.3 Theoretical Background	p. 41
3.2 The Theory of Ferromagnetic Resonance	p. 42
3.2.1 Dynamics of Magnetization	p. 42
3.2.2 Resonance Field for Polycrystalline Film	p. 44
3.2.3 Ferromagnetic Resonance in Single Crystalline Film	p. 45
3.2.4 Line-Width of Resonance Absorption	p. 47
3.3 Introduction	p. 50
3.3.1 Sample Preparation	p. 50
3.3.2 Magnetic Characterizations	p. 53
3.3.3 FMR Results	p. 55
3.4 Conclusions	p. 62
References	p. 64
4 Quantum Monte Carlo Study of Anderson Magnetic Impurities in Semiconductors	p. 67
4.1 Introduction	p. 67
4.2 Model	p. 69
4.3 Two-Dimensional Case	p. 71
4.3.1 Magnetic Correlations Between the Impurities	p. 71
4.3.2 Impurity-Host Correlations	p. 76
4.4 Three-Dimensional Case	p. 79
4.5 Tight-Binding Model for a Mn d Orbital in GaAs	p. 82
4.6 Discussion and Summary	p. 84
References	p. 86
5 New Type of Nanomaterials: Doped Magnetic Semiconductors Contained Ferrons, Antiferrons, and Afmons	p. 89
5.1 Introduction	p. 89
5.2 Ferrons	p. 90
5.2.1 Giant Red Shift of Fundamental Absorption Edge Connected with Ferromagnetic Ordering	p. 90
5.2.2 Notion of Ferrons	p. 92
5.2.3 Electrical Resistivity and Magnetoresistance of Nondegenerate Ferromagnetic Semiconducrors with n-Type of Electrical Conductivity	p. 94
5.2.4 Magnetic Two-Phase Ferromagnetic-Antiferromagnetic State in Manganites	p. 99
5.2.5 Antiferrons	p. 103
5.2.6 Afmons	p. 108
References	p. 110
6 Cerium-Doped Yttrium Iron Garnet Thin Films Prepared by Sol-Gel Process: Synthesis, Characterization, and Magnetic Properties	p. 113
6.1 Introduction	p. 114
6.2 Experimental Details	p. 117
6.3 Results and Discussion	p. 126
6.4 Summary and Conclusions	p. 127
References	p. 128
7 Tuning the Magnetic and Electronic Properties of Manganite Thin Films by Epitaxial Strain	p. 131
7.1 Introduction	p. 131
7.2 Preparation and Analysis of Films	p. 135
7.2.1 Deposition Technique and Film Growth	p. 135
7.2.2 Analysis of Films	p. 137
7.3 Structural Characterization, Electrical and Magnetic Properties of Manganites Film	p. 138
7.3.1 Structural Characterization	p. 138
7.3.2 Magnetic Properties	p. 139
7.3.3 Electrical Properties	p. 142
7.4 General Discussion	p. 144
7.5 Conclusions	p. 146
References	p. 146
8 Radiation Nanostructuring of Magnetic Crystals	p. 149
8.1 Introduction	p. 149
8.2 The Influence of Inhomogeneities upon the Properties of Ferrites and Ferrite Devices	p. 150
8.3 Wave-Front Reversal in a Medium with Inhomogeneities	p. 151
8.4 Experimental Results	p. 153
8.5 Discussions	p. 159
8.6 Conclusions	p. 164
References	p. 165
9 Electromagnetic Radiation of Micro and Nanomagnetic Structures with Magnetic Reversal	p. 167
9.1 Introduction	p. 167
9.2 Experimental	p. 168
9.3 Results and Discussion	p. 170
9.3.1 Coercivity Static Measurements of Magnetic Patterned Media	p. 170
9.3.2 The Dependence of the Amplitude and Duration of Emitted Signal on the External Magnetic Field Amplitude	p. 173
9.3.3 Experimental Determination of Dynamic Emitted Parameters of Magnetic Patterned Media	p. 174
9.3.4 Dependence of Dynamical Coercivity of Bit Arrays with Underlayer on the Bits Structural Geometry	p. 176
9.3.5 Peculiarities of the Magnetic Structure of Cobalt Bits with and without a Soft Magnetic Underlayer	p. 177
9.4 Conclusions	p. 180
References	p. 181
10 Structural and Magnetic Properties and Preparation Techniques of Nanosized M-type Hexaferrite Powders	p. 183
10.1 Introduction	p. 183
10.2 Crystalline Structure	p. 184
10.3 Magnetic Properties	p. 186
10.4 Methods for Preparation	p. 192
10.5 Microemulsion Technique	p. 196
References	p. 199
11 Nanocrystallization and Surface Magnetic Structure of Ferromagnetic Ribbons and Microwires	p. 205
11.1 Introduction	p. 205
11.2 Co-Rich Ribbons	p. 206
11.2.1 Experimental Details	p. 206
11.2.2 Results and Discussion	p. 207
11.3 Ni-Rich Ribbons	p. 210
11.3.1 XRD and AFM Structural Results	p. 210
11.3.2 Magnetic Results	p. 210
11.4 Microwires with Novel Composition Cu[subscript 70](Co[subscript 70]Fe[subscript 5]Si[subscript 10]B[subscript 15])[subscript 30]	p. 212
11.4.1 Experimental Details	p. 213
11.4.2 Results and Discussion	p. 213
References	p. 217
12 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
12.1 Introduction	p. 219
12.2 Experiment	p. 220
12.3 Results and Discussion	p. 220
12.3.1 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
12.3.2 Annealed Fe[subscript 73.5-x]Si[subscript 13.5]B[subscript 9]Cu[subscript 1]Nb[subscript 3]Mn[subscript x]	p. 224
12.4 Conclusions	p. 229
References	p. 230
13 FeCoZr-Al[subscript 2]O[subscript 3] Granular Nanocomposite Films with Tailored Structural, Electric, Magnetotransport and Magnetic Properties	p. 231
13.1 Introduction	p. 231
13.1.1 Granular Nanocomposites for Electronics: Reasons of Interest	p. 232
13.1.2 Preparation and Structure of Granular MMCs	p. 233
13.1.3 Percolation in Granular Nanocomposites	p. 235
13.1.4 Carrier Transport in Granular MMCs around Metal-Insulator Transition	p. 237
13.1.5 Magnetic Properties of Granular Nanocomposites	p. 242
13.2 Properties of FeCoZr-Al[subscript 2]O[subscript 3] Nanocomposite Films: Synthesis in Pure Ar and Mixed Ar + O Ambient	p. 243
13.2.1 Synthesis and Samples Preparation	p. 243
13.2.2 Mossbauer Spectroscopy	p. 244
13.2.3 Alternation Grads- and SQUID-Magnetometry	p. 246
13.2.4 Atomic Force-Magnetic Force Microscopy	p. 249
13.2.5 Electric and Magnetotransport Properties	p. 253
13.3 Concluding Remarks	p. 261
References	p. 263
14 Ferromagnetism of Nanostructures Consisting of Ferromagnetic Granules with Dipolar Magnetic Interaction	p. 269
14.1 Introduction	p. 269
14.2 Lattices of Point-like and Rod-like Ferromagnetic Granules with Dipole Interaction	p. 273
14.2.1 3D Lattice of Point-Like Granules	p. 275
14.2.2 2D Lattice of Point-Like Granules	p. 277
14.2.3 3D Lattice of Rod-Like Granules	p. 279
14.2.4 2D Lattice of Rod-Like Granules	p. 279
14.3 Lattices of Ellipsoidal Granules with Dipole Interaction	p. 280
14.3.1 Magnetic Field of the Ellipsoidal Granule	p. 280
14.3.2 3D Lattice of Ellipsoidal Granules	p. 282
14.3.3 2D Lattice of Prolate Ellipsoidal Granules	p. 282
14.3.4 2D Lattice with Oblate Ellipsoidal Granules	p. 284
14.3.5 2D Lattice of Oblate Ellipsoidal Granules in a Magnetic Field	p. 285
14.4 Partially Populated Lattices of Point-Like Ising Dipoles	p. 287
14.4.1 Distribution of Local Magnetic Fields	p. 288
14.4.2 Magnetic Phase Diagram	p. 290
14.5 Random Systems of Point-Like and Rod-Like Ising Dipoles	p. 295
14.5.1 Introduction	p. 295
14.5.2 Generalized Mean Field Theory for Point (Spherical) Dipoles	p. 296
14.5.3 Generalized Mean Field Theory for Rod-Like Dipoles	p. 303
14.5.4 Magnetic Properties of a Random System of Rod-Like Dipoles	p. 308
14.6 Experimental Examples	p. 311
14.6.1 Magnetism of Ultrathin Films	p. 311
14.6.2 2D Lattices of Disk-Shaped Granules in a Magnetic Field	p. 314
14.6.3 Magnetic Recording Density	p. 314
14.6.4 Conclusions	p. 318
References	p. 318
15 Magnetic Dipolar Interactions in Nanoparticle Systems: Theory, Simulations and Ferromagnetic Resonance	p. 321
15.1 Introduction	p. 321
15.2 Theory of Dipole - Dipole Interactions in Magnetic Nanoparticles	p. 322
15.2.1 Dipolar Interactions	p. 322
15.2.2 Simulations for Arrays of Nanoparticles	p. 323
15.3 Ferromagnetic Resonance in Magnetic Nanoparticles	p. 325
15.4 Conclusions	p. 326
References	p. 326
Contributors	p. 327

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