Magnetic Materials, I: Phenomenology
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The basic features and the various categories of magnetic materials are presented. Concepts such as magnetic domains, saturation magnetization, Bloch walls, hysteresis, soft and hard magnetic materials, remanance, and coercivity are introduced. The temperature dependence of the saturation magnetization and the magnetic susceptibility for simple ferromagnets, ferrimagnets, and antiferromagnets and the corresponding universal critical exponents are presented. Representative materials of each category of magnetic solids are mentioned and their properties are summarized. Thermodynamics provide an explanation for the temperature dependence of the saturation magnetization and the susceptibility, for the thickness of the Bloch walls, etc. Finally, the topic of spintronics is summarized, by briefly reviewing the efforts to exploit the electronic spin degrees of freedom at the time of this writing.
KeywordsSaturation Magnetization Magnetic Domain Anisotropy Energy Dilute Magnetic Semiconductor Primitive Cell
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- In Kittel’s book [SS74], pp. 322–385, the readers will find further information on magnetic materials.Google Scholar
- The thermodynamics of magnetic materials as well as other related information are presented in the book by Landau and Lifshitz [E15], pp. 130–179.Google Scholar
- An early review of the Spintronic field is given in [20.21].Google Scholar
- The subject of Spintronics is presented also in the books [Ma174] and [Ma175].xGoogle Scholar