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J. Phys. Soc. Jpn. 77 (2008) 013705 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Letters

Gigantic Optical Magnetoelectric Effect in CuB2O4

Mitsuru Saito, Kouji Taniguchi, and Taka-hisa Arima

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577

(Received October 29, 2007; Accepted November 26, 2007; Published January 10, 2008)

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. ©2008 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/77/013705/
DOI: 10.1143/JPSJ.77.013705


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