Gigantic optical magnetoelectric effect in CuB2O4

Mitsuru Saito, Kouji Taniguchi, Taka Hisa Arima

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


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 CuB2O4 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 Cu2+ sites, where the local inversion is slightly broken.

Original languageEnglish
Article number013705
Journaljournal of the physical society of japan
Issue number1
Publication statusPublished - 2008 Jan


  • Canted antiferromagnet
  • CuBO
  • Dzyialoshinskii-Moriya interaction
  • Magneto optics
  • Magnetoelectric effect
  • Nonreciprocal directional dichroism
  • Optical magnetoelectric effect
  • Spectroscopy
  • Spin orbit coupling

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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