INTRODUCTION TO. MAGNETIC MATERIALS. Second Edition. B. D. CULLITY. University of Notre Dame. C. D. GRAHAM. University of Pennsylvania. Introduction to Magnetic Materials, 2nd Edition covers the basics of magnetic quantities, magnetic devices, and materials used in practice. INTRODUCTION TO MAGNETISM AND MAGNETIC MATERIALS. Magnetism . Magnetic phenomena have been known and exploited for many centuries.
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1. CHAPTER 1. INTRODUCTION. Magnetic Materials. This project mainly deals with the characterization of a magnetic particle system. Let us focus on some. Magnetic Materials in Biomedical Applications (T. ruthenpress.info, U. W. Australia) .. ruthenpress.info WILL BE REVISITED LATER IN THIS INTRODUCTION. 37 . dependent on microstructure and control of domains, are introduced by and soft magnetic materials and recording media, are described in terms of.
While retaining much of the original, this revision now covers SQUID and alternating gradient magnetometers, magnetic force microscope, Kerr effect, amorphous alloys, rare-earth magnets, SI Units alongside cgs units, and other up-to-date topics.
In addition, the authors have added an entirely new chapter on information materials. The text presents materials at the practical rather than theoretical level, allowing for a physical, quantitative, measurement-based understanding of magnetism among readers, be they professional engineers or graduate-level students. Reviews "However, if you are a student learning about magnetism or are in industry or academia and need to learn about the fundamentals of magnetism, this is the book to own.
Author Bios The Late B. His major research interests were in the use of x-ray diffraction to measure lattice strains and in magnetostrictive phenomena.
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One of the most fundamental ideas in magnetism is the concept of the magnetic field. When a field is generated in a volume of space it means that there is a change in energy of that volume, and furthermore that there is an energy gradient so that a force is produced which can be detected by the acceleration of an electric charge moving in the field, by the force on a current-carrying conductor, by the torque on a magnetic dipole such as a bar magnet or even by a reorientation of spins on electrons within certain types of atoms.
The torque on a compass needle, which is an example of a magnetic dipole, is probably the most familiar property of a magnetic field. A magnetic field is produced whenever there is electrical charge in motion.
This can be due to an electrical current flowing in a conductor for example, as was first discovered by Oersted in . A magnetic field is also produced by a permanent magnet. In this case there is no conventional electric current, but there are the orbital motions and spins of electrons the so called 'Amperian currents' within the permanent magnet material which lead to a magnetization within the material and a magnetic field outside.
The magnetic field exerts a force on both current-carrying conductors and permanent magnets. There are a number of ways in which the magnetic field strength H can be defined. In accordance with the ideas developed here we wish to emphasize the connection between the magnetic field H and the generating electrical current.
We shall therefore define the unit of magnetic field strength, the ampere per metre, in terms of the generating current. The simplest definition is as follows. The ampere per metre The ampere per metre is the field strength produced by an infinitely long solenoid containing n turns per metre of coil and carrying a current of lin amperes. Since infinitely long solenoids are hypothetical a more practical alternative definition is to define the magnetic field strength in terms of the current passing through unit length of a conductor.
These two definitions are equivalent provided the Biot-Savart law holds.