Theory of Itinerant Electron Magnetism
Title | Theory of Itinerant Electron Magnetism PDF eBook |
Author | Jürgen Kübler |
Publisher | Oxford University Press |
Pages | 494 |
Release | 2017-03-23 |
Genre | Science |
ISBN | 0191565423 |
This book, in the broadest sense, is an application of quantum mechanics and statistical mechanics to the field of magnetism. Under certain well described circumstances, an immensely large number of electrons moving in the solid state of matter will collectively produce permanent magnetism. Permanent magnets are of fundamental interest, and magnetic materials are also of great practical importance as they provide a large field of technological applications. The physical details describing the many electron problem of magnetism are presented in this book on the basis of the local density functional approximation. The emphasis is on realistic magnets, for which the equations describing the many electron problem can only be solved by using computers. The great, recent and continuing improvements of computers are, to a large extent, responsible for the progress in the field. Along with a detailed introduction to the density functional theory, this book presents representative computational methods and provides the reader with a complete computer programme for the determination of the electronic structure of a magnet on a PC. A large part of the book is devoted to a detailed treatment of the connections between electronic properties and magnetism, and how they differ in the various known magnetic systems. Current trends are exposed and explained for a large class of alloys and compounds. The modern field of artificially layered systems - known as multilayers - and their industrial applications are dealt with in detail. Finally, an attempt is made to relate the rich thermodynamic properties of magnets to the ab initio results originating from the electronic structure.
Spin Fluctuations in Itinerant Electron Magnetism
Title | Spin Fluctuations in Itinerant Electron Magnetism PDF eBook |
Author | Toru Moriya |
Publisher | Springer Science & Business Media |
Pages | 253 |
Release | 2012-12-06 |
Genre | Technology & Engineering |
ISBN | 3642824994 |
Ferromagnetism of metallic systems, especially those including transition metals, has been a controversial subject of modern science for a long time. This controversy sterns from the apparent dual character of the d-electrons responsible for magnetism in transition metals, i.e., they are itinerant elec trons described by band theory in their ground state, while at finite tem peratures they show various properties that have long been attributed to a system consisting of local magnetic moments. The most familiar example of these properties is the Curie-Weiss law of magnetic susceptibility obeyed by almost all ferromagnets above their Curie temperatures. At first the problem seemed to be centered around whether the d-elec trons themselves are localized or itinerant. This question was settled in the 1950s and early 1960s by various experimental investigations, in particular by observations of d-electron Fermi surfaces in ferromagnetic transition metals. These observations are generally consistent with the results of band calculations. Theoretical investigations since then have concentrated on explaining this dual character of d-electron systems, taking account of the effects of electron-electron correlations in the itinerant electron model. The problem in physical terms is to study the spin density fluctuati·ons, which are ne glected in the mean-field or one-electron theory, and their influence on the physical properties.
Itinerant Electron Magnetism: Fluctuation Effects
Title | Itinerant Electron Magnetism: Fluctuation Effects PDF eBook |
Author | Dieter Wagner |
Publisher | Springer Science & Business Media |
Pages | 455 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 940115080X |
A summary of recent developments in theoretical and experimental studies of fluctuation effects in itinerant electron magnets, focusing on novel physical phenomena: soft-mode spin fluctuations and zero-point effects, strong spin anharmonicity, magnetic frustrations in metals, fluctuation effects in Invar alloys and low-dimensional systems. All of these may be important for novel high-technology applications.
Itinerant-electron Magnetism
Title | Itinerant-electron Magnetism PDF eBook |
Author | |
Publisher | |
Pages | 0 |
Release | 1977 |
Genre | |
ISBN |
Spin Fluctuation Theory of Itinerant Electron Magnetism
Title | Spin Fluctuation Theory of Itinerant Electron Magnetism PDF eBook |
Author | Yoshinori Takahashi |
Publisher | Springer |
Pages | 190 |
Release | 2013-04-09 |
Genre | Science |
ISBN | 364236666X |
This volume shows how collective magnetic excitations determine most of the magnetic properties of itinerant electron magnets. Previous theories were mainly restricted to the Curie-Weiss law temperature dependence of magnetic susceptibilities. Based on the spin amplitude conservation idea including the zero-point fluctuation amplitude, this book shows that the entire temperature and magnetic field dependence of magnetization curves, even in the ground state, is determined by the effect of spin fluctuations. It also shows that the theoretical consequences are largely in agreement with many experimental observations. The readers will therefore gain a new comprehensive perspective of their unified understanding of itinerant electron magnetism.
Physics of Magnetism and Magnetic Materials
Title | Physics of Magnetism and Magnetic Materials PDF eBook |
Author | K.H.J Buschow |
Publisher | Springer Science & Business Media |
Pages | 175 |
Release | 2007-05-08 |
Genre | Science |
ISBN | 0306484080 |
In this book, the fundamentals of magnetism are treated, starting at an introductory level. The origin of magnetic moments, the response to an applied magnetic field, and the various interactions giving rise to different types of magnetic ordering in solids are presented and many examples are given. Crystalline-electric-field effects are treated at a level that is sufficient to provide the basic knowledge necessary in understanding the properties of materials in which these effects play a role. Itinerant-electron magnetism is presented on a similar basis. Particular attention has been given to magnetocrystalline magnetic anisotropy and the magnetocaloric effect. Also, the usual techniques for magnetic measurements are presented. About half of the book is devoted to magnetic materials and the properties that make them suitable for numerous applications. The state of the art is presented of permanent magnets, high-density recording materials, soft-magnetic materials, Invar alloys and magnetostrictive materials. Many references are given.
Itinerant Electron Magnetism
Title | Itinerant Electron Magnetism PDF eBook |
Author | Tôru Moriya |
Publisher | |
Pages | 36 |
Release | 1982 |
Genre | |
ISBN |