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Published in:
The Basis of Nanomagnetism Read chapter Read first chapter

2017 | OriginalPaper | Chapter

3. Magnetism of Small Particles

Author : Alberto P. Guimarães

Published in: Principles of Nanomagnetism

Publisher: Springer International Publishing

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Abstract

Magnetic nanoparticles are important physical systems, relevant for many applications and, in many cases, the starting point of fundamental developments in nanomagnetism. The Stoner–Wohlfarth theory, discussed in this chapter, represents a milestone in the process of understanding nanoparticle magnetism. This theory describes the magnetic properties of ellipsoidal magnetic particles, including the conditions for the homogeneous reversal of their magnetization under applied magnetic field. Magnetic nanoparticles present spin arrangements that may be single domain, vortex state, or multidomain, with their magnetic behavior depending on the spin configuration. The critical diameters for these configurations can be derived in an approximate form. Nanoparticles in the smaller range of diameters do not behave as stable magnets, exhibiting the phenomenon of superparamagnetism .

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Metadata
Title
Magnetism of Small Particles
Author
Alberto P. Guimarães
Copyright Year
2017
Book
Principles of Nanomagnetism

Print ISBN: 978-3-319-59408-8

Electronic ISBN: 978-3-319-59409-5

Copyright Year: 2017

DOI
https://doi.org/10.1007/978-3-319-59409-5_3

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