Proceedings of the International School of Physics "Enrico Fermi.", Volume 70N. Zanichelli, 1978 - Nuclear physics |
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Page 200
... states near the ground state can be approximated by sinusoidal spin waves . In evaluating the excited states it will be useful to express the Hamiltonian in terms of the raising and lowering operators ( 1.17 ) S = Sis and of S. Equation ...
... states near the ground state can be approximated by sinusoidal spin waves . In evaluating the excited states it will be useful to express the Hamiltonian in terms of the raising and lowering operators ( 1.17 ) S = Sis and of S. Equation ...
Page 253
7. Nonparallel ground state . - To this point , the description of the spin wave excitations has assumed that the ground state of the system is an array of parallel spins whose direction is determined by the equilibrium of the « bulk ...
7. Nonparallel ground state . - To this point , the description of the spin wave excitations has assumed that the ground state of the system is an array of parallel spins whose direction is determined by the equilibrium of the « bulk ...
Page 452
... states in the reduced symmetry of the crystal field which produces the crystal field levels depicted in fig . 3. Optical transitions from the ground state to these crystal field levels are clearly spin forbidden and , since they all ...
... states in the reduced symmetry of the crystal field which produces the crystal field levels depicted in fig . 3. Optical transitions from the ground state to these crystal field levels are clearly spin forbidden and , since they all ...
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absorption angle anisotropy constants antiferromagnetic Appl axis birefringence Bloch lines Bloch point bubble calculated cation cm-¹ Co² Co³ coefficient concentration contribution crystal field cubic Curie temperature curve diamagnetic dichroism direction of magnetization domain wall effects electron energy levels equations exchange experimental Fe2+ Fe³ ferrimagnetic ferromagnetic resonance film formula unit frequency GELLER GILLEO given Hamiltonian interaction ion moments Journ K₁ lattice constant line width linear magnetic anisotropy magnetic field magneto-optical magnetoelastic magnons measurements modes neutron diffraction observed obtained octahedral octahedral sites optical orbital oxygen paramagnetic parameters phonons photoinduced photomagnetic Phys polarization polycrystalline properties rare-earth ions rare-earth iron garnets relaxation resonance room temperature rotation sample shown in fig sin² specimens spin wave spin-orbit coupling spontaneous magnetization sublattice substitution surface symmetry temperature dependence tetrahedral theory tion torque transitions uniaxial anisotropy valence values vector velocity yttrium iron garnet