## Proceedings of the International School of Physics "Enrico Fermi.", Volume 70N. Zanichelli, 1978 - Nuclear physics |

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Page 343

Hence the es' are obtained straightforwardly from e, by means of the spin-1

rotation matrix, that is (8a) e!” = o: (1 ... To obtain o, we note that the

probability is ...

Hence the es' are obtained straightforwardly from e, by means of the spin-1

rotation matrix, that is (8a) e!” = o: (1 ... To obtain o, we note that the

**matrix****elements**of the absorption are linear with respect to e”, so that the absorptionprobability is ...

Page 473

2) To calculate the energy levels by perturbation theory [19] we have to evaluate

the

i.e. {|SMs)}. (S = 2) quantized along the z-axis. We obtain with accuracy to ...

2) To calculate the energy levels by perturbation theory [19] we have to evaluate

the

**matrix elements**[17] of the transformed *... in the basis of eigenstates of (12),i.e. {|SMs)}. (S = 2) quantized along the z-axis. We obtain with accuracy to ...

Page 475

2) Then we calculate the

},}. 3) From the general spin Hamiltonian expressions discussed in part I, sect. 4,

we are able to estimate numerically the parameters B.", however now the ...

2) Then we calculate the

**matrix elements**of Lo.) and 0°(L)(?..) in the new basis {q},}. 3) From the general spin Hamiltonian expressions discussed in part I, sect. 4,

we are able to estimate numerically the parameters B.", however now the ...

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### Contents

Gruppo fotografico dei partecipanti al Corso fuori testo | 1 |

Octahedral sites | 3 |

Hightemperature results | 4 |

Copyright | |

34 other sections not shown

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### Common terms and phrases

absorption angle anisotropy constants anisotropy energy annealing antiferromagnetic Appl axis Bloch lines Bloch point Bloch wall Bloch-line bubble calculated coefficients compensation point contribution Cošt crystal field cubic Curie temperature curve d-site diamagnetic dichroism direction of magnetization domain wall effects electron energy levels equation exchange experimental Fe2+ Fe3+ ions ferromagnetic resonance formula unit frequency gadolinium Gd3+ ion GELLER GILLEo given Hamiltonian interaction ion moments Journ lattice constant line width linear magnetic field magnetic ions magnetoelastic magnetostriction constants measurements neutron diffraction observed octahedral octahedral sites orientation parameter phonons photoinduced photomagnetic Phys plane polarization rare-earth ions rare-earth iron garnets relaxation respectively room temperature rotation sample shown in fig specimens spin wave spontaneous magnetization sublattice substitution symmetry temperature dependence temperature variation tetrahedral theory tion torque transition uniaxial anisotropy valence values vector velocity yttrium iron garnet