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is the only book that deals with the phenomenon of magnetism from thepoint of view of "linear response". That is, how does a magnetic materialrespond when excited by a magnetic field? That field may be uniform, orspatially varying, static or time dependent. Previous editions have dealtprimarily with the magnetic response. This edition incorporates the resistiveresponse of magnetic materials as well. It also includes problems to test thereader's (or student's) comprehension. The rationale for a book on magnetismis as valid today as it was when the first two editions of Quantum Theory ofMagnetism were published. Magnetic phenomena continue to be discovered withdeep scientific implications and novel applications. Since the SecondEdition, for example, Giant Magneto Resistance (GMR) was discovered and thenew field of "spintronics" is currently expanding. Not only do thesephenomena rely on the concepts presented in this book, but magneticproperties are often an important clue to our understanding of new materials(e.g., high-temperature superconductors). Their magnetic properties, studiedby susceptibility measurements, nuclear magnetic resonance, neutronscattering, etc. have provided insight to the superconductivity state.Thisupdated edition offers revised emphasis on some material as a result ofrecent developments and includes new material, such as an entire chapter onthin film magnetic multilayers. Researchers and students once again haveaccess to an up-to-date classic reference on magnetism, the keycharacteristic of many modern materials.