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Phys. Rev. Lett. 93, 037403 (2004) [4 pages]

Optical Magnetoelectric Effect in the Polar GaFeO3 Ferrimagnet

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J. H. Jung1,2, M. Matsubara3, T. Arima1,4, J. P. He1, Y. Kaneko1, and Y. Tokura1,3,5
1Spin Superstructure Project, ERATO, Japan Science and Technology Agency (JST), Tsukuba 305-8562, Japan
2Department of Physics, Inha University, Incheon 402-751, Korea
3Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
4Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan
5Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-0046, Japan

Received 25 December 2003; published 16 July 2004

The optical magnetoelectric (ME) effect, i.e., the change of optical absorption upon the reversal of the light propagation direction, has been investigated for a polar ferrimagnet GaFeO3. For dipole- and spin-forbidden d-d transition bands located at 1.2–2.3 eV, a clear signal of the optical ME effect (Δαt∼3×10-3) is observed with an applied magnetic field as low as 500 Oe and a sample thickness (t) of 50   μm. The observation of a large ME effect in the present compound suggests a possible route to magnification of this novel phenomenon for application.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.037403
DOI:
10.1103/PhysRevLett.93.037403
PACS:
78.20.Ls, 75.50.Dd, 78.40.–q
 
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