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SEM1CLASSICAL THEORY OF SPIN WAVES IN ORTHO
THEORY OF THE PHASE TRANSITION
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Absorption frequencies absorption lines Absorption spectrum Acta Cryst anisotropy terms antiferromagnetic antisymmetric exchange applied field approximately Beaulieu compounds cryostat crystal data data was taken diagonalization diamagnetic dispersion curve exchange constant exchange interaction exchange modes far-infrared Fe spins Fe-Fe Fe-RE exchange Fe-RE interaction ferrites ferromagnet Figure frequency of line gyromagnetic ratio Hamiltonian helium hidden canting high temperature phase iron spins iron sublattices lattice linewidths low frequency low temperature phase LuFeO magnetic field magnetic structure matrix microwave molecular field Morin-type transition Neel temperature normal modes optically active orthoferrites oscillating parameters pellet samples phase transitions Phys precession rare earth magnetization rare earth spins resonant frequencies rotation secular equation Shane shown in Fig single crystals spin wave spin-reorientation transition spins per unit symmetric exchange temperature dependence theory Treves unit cell unmixed modes values vector wave number weak ferromagnet YbFeO YbFeO-j z-direction