Principles of Nanomagnetism

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. Les mer
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Vår pris: 2194,-

(Innbundet) Fri frakt!
Leveringstid: Usikker levering*
*Vi bestiller varen fra forlag i utlandet. Dersom varen finnes, sender vi den så snart vi får den til lager
På grunn av Brexit-tilpasninger og tiltak for å begrense covid-19 kan det dessverre oppstå forsinket levering.

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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.

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Innholdsfortegnelse

1 Basis of Nanomagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5



1.1 Introduction: The Importance of Nanomagnetism . . . . . . . . . . . . . . . . 5



1.2 The Origin of Nanomagnetic Behavior . . . . . . . . . . . . . . . . . . . . . . . . . 7



1.2.1 Sample Dimensions and Characteristic Lengths . . . . . . . . . . . 8



1.2.2 Broken Translation Symmetry . . . . . . . . . . . . . . . . . . . . . . . . . 9



1.2.3 Nanoscopic Samples and Magnetization Reversal . . . . . . . . . 20



1.3 Dimensionality and Critical Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . 20



References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23



2 Magnetic Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25



2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25



2.2 Interactions in Magnetic Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31



2.2.1 Exchange Interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32



2.2.2 Magnetostatic Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34



2.2.3 Magnetic Anisotropy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36



2.2.4 Magnetoelastic Energy and Magnetostriction . . . . . . . . . . . . . 37



2.3 Elements of Micromagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38



2.3.1 Equation of Motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44



2.4 Magnetic Domains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45



2.4.1 Domain Wall Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46



2.4.2 Domain Wall Motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53



2.5 Random Anisotropy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57



References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58



3 Magnetism of Small Particles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61



3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61



3.2 Particle Size and Magnetic Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 65



3.3 Superparamagnetism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70



3.3.1 Superparamagnetism: The Langevin Function . . . . . . . . . . . . 78



3.4 Surface Effects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78



3.5 The Stoner-Wohlfarth Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81



3.5.1 Inhomogeneous Magnetization Reversal . . . . . . . . . . . . . . . . . 91



3.5.2 Precessional Magnetization Reversal . . . . . . . . . . . . . . . . . . . . 94



3.5.3 Current-Induced Magnetization Reversal . . . . . . . . . . . . . . . . 97



3.6 Interaction Between Particles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98



References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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