Guimarães Principles of Nanomagnetism

2. Auflage 2017
ISBN: 978-3-319-59409-5
Verlag: Springer Nature Switzerland
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 335 Seiten

Reihe: NanoScience and Technology

The second edition of this book on nanomagnetism presents the basics and latest studies of low-dimensional magnetic nano-objects. It highlights the intriguing properties of nanomagnetic objects, such as thin films, nanoparticles, nanowires, nanotubes, nanodisks and nanorings as well as novel phenomena like spin currents. It also describes how nanomagnetism was an important factor in the rapid evolution of high-density magnetic recording and is developing into a decisive element of spintronics. Further, it presents a number of biomedical applications. With exercises and solutions, it serves as a graduate textbook.

Alberto Passos Guimarães studied physics at the University of Rio de Janeiro and obtained his Ph.D. at the University of Manchester, England. He was a visiting scientist at MIT, Cambridge, and at the Physics Institute in Uppsala, Sweden. He has worked in the field of magnetism for several years, initially studying the magnetic properties of rare-earth intermetallic compounds with Mossbauer Spectroscopy and zero-field nuclear magnetic resonance (NMR), and also studied the Magnetocaloric Effect in intermetallic compounds. In recent years he has turned his attention to nanoscale systems, such as small particles, nanowires, nanorings and nanodisks studied with different experimental techniques and micromagnetic simulation. He is the author of Magnetism and Magnetic Resonance in solids (1998) and From Lodestone to Supermagnets: Understanding Magnetic Phenomena (2005), and has also been active in the popularization of science. He is now Emeritus Researcher at the Brazilian Center for Research in Physics (CBPF) and he is a member of the Brazilian Academy of Sciences.

Autoren/Hrsg.

Guimarães, Alberto P.

Inhaltsverzeichnis

1;Foreword;7
2;Preface to the Second Edition;9
3;Preface to the First Edition;10
3.1;References;11
4;Contents;12
5;1 The Basis of Nanomagnetism;15
5.1;1.1 Introduction: The Importance of Nanomagnetism;15
5.2;1.2 The Origin of Nanomagnetic Behavior;16
5.2.1;1.2.1 Sample Dimensions and Characteristic Lengths;18
5.2.2;1.2.2 Broken Translation Symmetry;20
5.2.3;1.2.3 Nanomagnetic Samples and Dynamic Behavior;31
5.3;1.3 Dimensionality and Critical Behavior;31
5.4;References;36
6;2 Magnetic Domains;38
6.1;2.1 Introduction;38
6.2;2.2 Interactions in Magnetic Materials;45
6.2.1;2.2.1 Exchange Interaction;46
6.2.2;2.2.2 Magnetostatic Energy;49
6.2.3;2.2.3 Magnetic Anisotropy;51
6.2.4;2.2.4 Magnetoelastic Energy and Magnetostriction;53
6.3;2.3 Elements of Micromagnetism;54
6.3.1;2.3.1 Equation of Motion;59
6.4;2.4 Magnetic Domains;61
6.4.1;2.4.1 Domain Wall Width;63
6.4.2;2.4.2 Single-Domain Critical Diameters;69
6.4.3;2.4.3 Domain Wall Motion;71
6.5;2.5 Random Anisotropy;78
6.6;References;81
7;3 Magnetism of Small Particles;84
7.1;3.1 Introduction;84
7.2;3.2 Particle Size and Magnetic Behavior;88
7.3;3.3 Superparamagnetism;95
7.3.1;3.3.1 Superparamagnetism: The Langevin Function;103
7.4;3.4 Surface Effects;104
7.5;3.5 The Stoner--Wohlfarth Model;107
7.5.1;3.5.1 Inhomogeneous Magnetization Reversal;118
7.5.2;3.5.2 Precessional Magnetization Reversal;121
7.5.3;3.5.3 Current-Induced Magnetization Reversal;124
7.6;3.6 Interaction Between Particles;125
7.7;References;134
8;4 Magnetism of Thin Films and Multilayers;138
8.1;4.1 Introduction;138
8.1.1;4.1.1 Thin Films: Planar Systems;139
8.1.2;4.1.2 Thin Films: Laterally Structured Systems;143
8.2;4.2 Anisotropy in Thin Films;145
8.3;4.3 Domain Walls and Magnetization Reversal in Thin Films;148
8.4;4.4 Exchange Bias;151
8.5;4.5 Interlayer Exchange Coupling;157
8.6;References;161
9;5 Magnetotransport and Spin Current Effects;164
9.1;5.1 Introduction;164
9.2;5.2 Spin Dependent Scattering and Giant Magnetoresistance (GMR);173
9.2.1;5.2.1 Valet--Fert Model for GMR;180
9.3;5.3 Tunnel Magnetoresistance (TMR) and Other Magnetoresistance Effects;182
9.3.1;5.3.1 The Anisotropic Magnetoresistance (AMR);187
9.4;5.4 Current-Induced Domain Wall Motion and Spin Transfer Torque (STT);189
9.5;5.5 Spin Current Effects: Spin Hall Effect, Spin Pumping, and Spin Thermal Effects;194
9.6;References;208
10;6 Magnetism of Nanodisks, Nanorings, Nanowires, and Nanotubes;213
10.1;6.1 Introduction;213
10.2;6.2 Nanodisks;214
10.3;6.3 Nanorings;222
10.4;6.4 Nanowires and Nanotubes;226
10.5;References;238
11;7 Magnetic Recording;242
11.1;7.1 Introduction;242
11.2;7.2 Principles of Magnetic Recording;243
11.3;7.3 Novel Magnetic Recording Systems;248
11.3.1;7.3.1 Nanodisk and Nanoring Memories;251
11.3.2;7.3.2 Domain Wall and Skyrmion Memories;255
11.4;References;257
12;Solutions to the Exercises;260
12.1;Problems of Chapter 1;260
12.2;Problems of Chapter 2;260
12.3;Problems of Chapter 3;262
12.4;Problems of Chapter 4;263
12.5;Problems of Chapter 5;264
12.6;Problems of Chapter 6;265
12.7;Problems of Chapter 7;266
13;Appendix A The Hall Effect;267
14;Appendix B Elements of Thermoelectricity;271
15;Appendix C Units in Magnetism;274
16;Appendix D Physical Constants;277
17;Glossary;278
18;Bibliography;284
19;Material Index;303
20;Symbol Index;315
21;Author Index;318
22;Subject Index;324