Proceedings of the International School of Physics "Enrico Fermi.", Volume 70N. Zanichelli, 1978 - Nuclear physics |
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Page 201
... exp [ ikia ] , where a is the distance between spins . The periodic boundary conditions re- quire C to equal C , which yields the following values of k : ( 1.25 ) kaN 2π = 0 , 1 , 2 , ... , N - 1 . If eq . ( 1.24 ) is substituted into ...
... exp [ ikia ] , where a is the distance between spins . The periodic boundary conditions re- quire C to equal C , which yields the following values of k : ( 1.25 ) kaN 2π = 0 , 1 , 2 , ... , N - 1 . If eq . ( 1.24 ) is substituted into ...
Page 207
... exp [ i ( k + k ' ) · r , ] · exp [ i ( k · { ≥ 4SB , exp [ ik · ( r , — ( − r ) ] } · j The sum over j in the curly brackets is assumed to be independent of i , which is usually true everywhere except at the surface . The various ...
... exp [ i ( k + k ' ) · r , ] · exp [ i ( k · { ≥ 4SB , exp [ ik · ( r , — ( − r ) ] } · j The sum over j in the curly brackets is assumed to be independent of i , which is usually true everywhere except at the surface . The various ...
Page 219
... exp [ itl ] into the set of equations in ( 4.19 ) gives the dispersion relations ( 4.22 ) E ( k , r ) = E ( k , r ' ) = gu , Hell . + Jeff + 28Jo ( % - 1 * ) + 4SJ , ( Z , − | Ã1 | cos t ' ) , - where ' is a new quantum number defined ...
... exp [ itl ] into the set of equations in ( 4.19 ) gives the dispersion relations ( 4.22 ) E ( k , r ) = E ( k , r ' ) = gu , Hell . + Jeff + 28Jo ( % - 1 * ) + 4SJ , ( Z , − | Ã1 | cos t ' ) , - where ' is a new quantum number defined ...
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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