## Quantum theory of magnetismThis book provides a unified description of magnetic phenomena through means of the generalized susceptibility. The book begins by discussing the general properties of the susceptibility, its complex nature, its symmetry, and its relation to magnetic fluctuations.Next, the quantum basis of magnetic phenomena is established. The bulk of the book builds on this theoretical foundation to calculate the magnetic response to spatial and time-varying magnetic fields. This provides a natural way of thinking about long-range order, critical phenomena, resonance, etc. A new chapter is included which deals with the magnetic properties of thin film magnetic structures which have many potential applications. |

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### Contents

The Magnetic Susceptibility | 1 |

The Magnetic Hamiltonian | 29 |

The Static Susceptibility of Noninteracting Systems | 69 |

Copyright | |

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absorption amplitude antiferromagnet applied field approximation associated assume atomic average axis band becomes behavior calculated Chap characterized components compute configuration contribution correlation function corresponds Coulomb critical exponents crystal field cubic defined density diamagnetic dipolar distribution eigenfunctions eigenvalues energy example exchange interaction excited experimental external field fact Fermi liquid Fermi surface ferromagnetic frequency Gaussian Green's function Hamiltonian Hartree-Fock illustrated in Fig impurity integral involving ionic ions Landau lattice Let us consider linear magnetic field magnetic system magnon matrix elements Maxwell's equations metal Mn2+ modes moments momentum neutron noninteracting nonlinear Notice nuclear obtain operator orbital paramagnetic particles Pauli perturbation phase phonons Phys polarization potential proportional quantized quantum numbers quasiparticle relation relaxation resonance response result rotation sample scattering shown in Fig spectrum spin waves spin-orbit spin-wave Stoner superconductor symmetry temperature dependence theorem theory tion transition uniform Vleck wave function wave vector Zeeman zero