Linear magneto-optical effect in the incommensurate phase of antiferromagnetic LiNiPO4

A linear magneto-optical effect, birefringence of linearly polarized light that is directly proportional to magnetic field strength, is observed in magnetoelectric crystals of the orthophosphate LiNiPO4. This effect is especially pronounced in the incommensurate antiferromagnetic phase of the crysta...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2014-11, Vol.40 (11), p.1029-1031
Main Authors: Kharchenko, Yu. M., Miloslavskaya, O. V., Kharchenko, M. F.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Birefringence
Crystal structure
Crystals
Ferromagnetism
Field strength
Linear polarization
Neutron diffraction
Polarized light
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Summary:A linear magneto-optical effect, birefringence of linearly polarized light that is directly proportional to magnetic field strength, is observed in magnetoelectric crystals of the orthophosphate LiNiPO4. This effect is especially pronounced in the incommensurate antiferromagnetic phase of the crystal. The linear magneto-optical effect indicates that the magnetic symmetry groups of the incommensurate, as well as the commensurate, phases of antiferromagnetic LiNiPO4 lack an anti-inversion operation. This fact is consistent with the existence of ultraweak ferromagnetism in the crystal and indicates that this antiferromagnet has more complicated magnetic structures than those found in neutron diffraction experiments.
ISSN:1063-777X
1090-6517
DOI:10.1063/1.4901407