Proceedings of the International School of Physics "Enrico Fermi.", Volume 70N. Zanichelli, 1978 - Nuclear physics |
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Page 102
... perturbation theory , and then the Hamiltonian ( 6.4 ) can be re - expressed in terms of a pure spin Hamiltonian , yielding ( 6.6 ) H = • 1 gμB Hexch S + D \ D { s : = { } $ ( 8 + 1 ) } - + + S4 + Si + 84 ( S + 1 ) ( 382 + 38−1 ) } + + ...
... perturbation theory , and then the Hamiltonian ( 6.4 ) can be re - expressed in terms of a pure spin Hamiltonian , yielding ( 6.6 ) H = • 1 gμB Hexch S + D \ D { s : = { } $ ( 8 + 1 ) } - + + S4 + Si + 84 ( S + 1 ) ( 382 + 38−1 ) } + + ...
Page 256
... perturbation on the energy density in the surface region causing an additional torque on the magnetization that is appreciable within a region of a few decay lengths , 4 - 1 , from the surface . Beyond this region , the spin wave will ...
... perturbation on the energy density in the surface region causing an additional torque on the magnetization that is appreciable within a region of a few decay lengths , 4 - 1 , from the surface . Beyond this region , the spin wave will ...
Page 473
... perturbation to ( 12 ) . 2. Theory for spin S = 2 . - m.f. The derivation of the microscopic expressions for the single - ion cubic ani- sotropy constants K , and K , follows along this line [ 21 ] : axis 2 1 ) pin ( 6 ) is expressed in ...
... perturbation to ( 12 ) . 2. Theory for spin S = 2 . - m.f. The derivation of the microscopic expressions for the single - ion cubic ani- sotropy constants K , and K , follows along this line [ 21 ] : axis 2 1 ) pin ( 6 ) is expressed in ...
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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