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VOLUME 42 | ISSUE 11 | PAGE 553
Quadratic magnetic rotation of the polarization plane of light in the antiferromagnet CoF2
A magnetic-field-induced rotation of the polarization plane of light, proportional to the square of the magnetic field, has been observed experimentally in a two-sublattice antiferromagnetic crystal without an anti-inversion center. The rotation occurs in different directions for states of the crystal with opposite directions of the antiferromagnetic vector. The magnitude of the rotation is such that it is possible to visually observe 180° antiferromagnetic domains in moderate magnetic fields.

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