Abstract
Although it has been well known that materials in which both space inversion and time reversal symmetries are broken can host optical magneto-electric effect, i.e., change in optical constants with the reversal of propagating direction of light, the largest change in absorption ever reported on this effect was 0.2%. Here we show that optical absorption in noncentrosymmetric weak ferromagnetic material CuB 2 O 4 changes by more than 100% with reversal of a low magnetic field of 300 Oe. The gigantic optical magneto-electric effect is ascribed to the canted antiferromagnetic spin ordering of square-coordinated Cu 2+ sites, where the local inversion is slightly broken.
Highlights
It has been well known that materials in which both space inversion and time reversal symmetries are broken can host optical magneto-electric effect, i.e., change in optical constants with the reversal of propagating direction of light, the largest change in absorption ever reported on this effect was 0.2%
The gigantic optical magneto-electric effect is ascribed to the canted antiferromagnetic spin ordering of squarecoordinated Cu2þ sites, where the local inversion is slightly broken
Linear magneto-electric (ME) effect — induction of magnetization by an electric field or of electric polarization by a magnetic field is anticipated in crystals which have neither space-inversion nor time-reversal symmetry.1,2) One of the intriguing effects in such ME materials is a peculiar nonreciprocal optical effect, which is a change in optical constants with the reversal of propagating direction of light.3–6) This effect can be regarded as an expansion of linear ME effects into optical frequencies
Summary
It has been well known that materials in which both space inversion and time reversal symmetries are broken can host optical magneto-electric effect, i.e., change in optical constants with the reversal of propagating direction of light, the largest change in absorption ever reported on this effect was 0.2%. Linear magneto-electric (ME) effect — induction of magnetization by an electric field or of electric polarization by a magnetic field is anticipated in crystals which have neither space-inversion nor time-reversal symmetry.1,2) One of the intriguing effects in such ME materials is a peculiar nonreciprocal optical effect, which is a change in optical constants with the reversal of propagating direction of light.3–6) This effect can be regarded as an expansion of linear ME effects into optical frequencies.
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