By V.V. Eremenko, N.F. Kharchenko, Yu.G. Litvinenko, V.M. Naumenko
Certain magnetic fabrics have optical homes that cause them to appealing for a wide selection of functions comparable to optical switches. This ebook describes the physics of 1 type of such magnetooptic fabrics, the insulating antiferromagnets. The authors summarize fresh effects in regards to the constitution, optical houses, spectroscopy, and magnetooptical houses of those fabrics. particularly, they give thought to magnetic part transitions, symmetry results, the linear magnetooptical impact, magnons, spectroscopic research of spin waves, photoinduced magnetic results, and the results of impurities.
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Additional info for Magneto-Optics and Spectroscopy of Antiferromagnets
3T fYf z - - 36/( 33/( ~Rgl( t --t ;1(11:=+31 ",,1/1 o +0,2 -0,2 AfI1'l1z=-3T P2itJtJ P28tJO E,eI7]"' ,. 25% 151( 2%00 WOO P28tJ(J em-/ Fig. 16. Magnetic linear dichroism in the exciton-magnon absorption. The changing of states will lead to various changes in the transition oscillator forces in both types of ions. Both mechanisms, causing the sublattice nonequivalence, disturb the compensation of the birefringence properties of the crystal magnetic sublattices. Paer [80, 81, 117] evaluated the possible role of the quantum-mechanical mixing of states in the linear birefringence induced by a magnetic field.
The sublattice remagnetization process can be delayed by tilting the magnetic field so that the transverse component H ~ is oriented in the required direction. The field transverse component orienting the WFM moment M~ unambiguously orients L too. 80). In the presence of both field components, the competition of the interactions leads to the dependence of the azimuth angle of the AFM vector on the relation H z / H ~. At a sufficiently high value of H ~ the AFM vector can be to some extend fixed, and the reduction of birefringence (ng - nm) when Hz change sign can be observed .
Experimental Investigations of the Linear Magneto-Optic Effect 33 All experiments on study the new magneto-optic effects which are symmetrically allowed in magnetically ordered crystals should only be carried out on specimens with a uniformly ordered magnetic subsystem. Therefore, these experiments always involve the complex task of monodomainization of AFM samples. It is simplified due to the fact that in the investigated cases the combined action on the AFM crystal can lead to an energy nonequivalence of 180-degree or time-inverted states, which differ by the spin moments of the ions belonging to the same sublattices.