By Kannan M. Krishnan
Scholars and researchers searching for a finished textbook on magnetism, magnetic fabrics and similar functions will locate during this ebook an outstanding rationalization of the sector. Chapters development logically from the physics of magnetism, to magnetic phenomena in fabrics, to measurement and dimensionality results, to functions. starting with an outline of magnetic phenomena and measurements on a macroscopic scale, the booklet then provides discussions of intrinsic and phenomenological innovations of magnetism comparable to digital magnetic moments and classical, quantum, and band theories of magnetic habit. It then covers ordered magnetic fabrics (emphasizing their structure-sensitive homes) and magnetic phenomena, together with magnetic anisotropy, magnetostriction, and magnetic area buildings and dynamics. What follows is a finished description of imaging easy methods to unravel magnetic microstructures (domains) besides an creation to micromagnetic modeling. The e-book then explores intimately measurement (small debris) and dimensionality (surface and interfaces) results -- the underpinnings of nanoscience and nanotechnology which are introduced into sharp concentration via magnetism.
The hallmark of recent technological know-how is its interdisciplinarity, and the second one half the e-book bargains interdisciplinary discussions of data know-how, magnetoelectronics and the way forward for biomedicine through contemporary advancements in magnetism. smooth fabrics with adapted houses require cautious artificial and characterization thoughts. The booklet additionally contains suitable info of the chemical synthesis of small debris and the actual deposition of extremely skinny movies. furthermore, the ebook provides information of cutting-edge characterization tools and summaries of consultant households of fabrics, together with tables of houses. CGS equivalents (to SI) are included.
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Extra resources for Fundamentals and applications of magnetic materials
B) Principle of a magnetic mine used in naval warfare. 6 Calculating the demagnetizing factor for a sphere (of radius a). 6a), Hd = –4πM/3 (CGS) In general, since the demagnetizing field is proportional to M, we write Hd = –Nd M, where Nd is the demagnetization factor. 7a) A sphere is isotropic and hence, by symmetry, the demagnetization factor is independent of the direction of magnetization. 8a) Demagnetization 33 We shall illustrate these ideas with two examples of ellipsoids of revolution that can be used to determine demagnetizing factors for commonly observed objects such as long, needle-shaped precipitates, or flat thin films, respectively.
The normally small negative susceptibility has been exaggerated for clarity. 1 Diamagnetism Atoms or compounds with no effective magnetic moment, or materials with completely filled electronic shells, such as noble gases, ionic solids, or semiconductors with strong covalent bonding, exhibit diamagnetic behavior. In all such materials, the electrical charges have a tendency to partially shield the interior of the body from magnetic fields. 1), and originates from the precession of the electronic orbits around An Overview of the Types of Magnetic Behavior in Materials 23 the direction of the applied magnetic field.
6a), Hd = –4πM/3 (CGS) In general, since the demagnetizing field is proportional to M, we write Hd = –Nd M, where Nd is the demagnetization factor. 7a) A sphere is isotropic and hence, by symmetry, the demagnetization factor is independent of the direction of magnetization. 8a) Demagnetization 33 We shall illustrate these ideas with two examples of ellipsoids of revolution that can be used to determine demagnetizing factors for commonly observed objects such as long, needle-shaped precipitates, or flat thin films, respectively.