Proceedings of the International School of Physics "Enrico Fermi.", Volume 70N. Zanichelli, 1978 - Nuclear physics |
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Page 200
... spin deviation between a large number of spins . In this mode , the angle between adjacent spins is small and , since the exchange energy is proportional to the cosine of the angle between adjacent spins , the exchange energy in the spin ...
... spin deviation between a large number of spins . In this mode , the angle between adjacent spins is small and , since the exchange energy is proportional to the cosine of the angle between adjacent spins , the exchange energy in the spin ...
Page 215
... spin operators will be considered . The calculations are carried out for a Hamiltonian consisting of a Heisen- berg localized spin model having nearest - neighbor exchange and a Zeeman energy term similar to the form given in eq ...
... spin operators will be considered . The calculations are carried out for a Hamiltonian consisting of a Heisen- berg localized spin model having nearest - neighbor exchange and a Zeeman energy term similar to the form given in eq ...
Page 468
... spin Hamiltonian . To ) , the « quenching » of orbital element < æ¦à . > = 0 [ 7 ] . For has been introduced [ 1 , 2 , 5-7 ] . If the ground state is an orbital singlet ... spin Hamiltonian 468 CZ . RUDOWICZ Conventional spin Hamiltonian •
... spin Hamiltonian . To ) , the « quenching » of orbital element < æ¦à . > = 0 [ 7 ] . For has been introduced [ 1 , 2 , 5-7 ] . If the ground state is an orbital singlet ... spin Hamiltonian 468 CZ . RUDOWICZ Conventional spin Hamiltonian •
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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