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Phys. Rev. Lett. 92, 137401 (2004) [4 pages]

X-Ray Directional Dichroism of a Polar Ferrimagnet

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M. Kubota1,*, T. Arima1,2,†, Y. Kaneko1, J. P. He1, X. Z. Yu1, and Y. Tokura1,3,4
1Spin Superstructure Project, ERATO, Japan Science and Technology Corporation, AIST Tsukuba Central 4, Tsukuba 305-8562, Japan
2Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan
3Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan
4Correlated Electron Research Center (CERC), AIST Tsukuba Central 4, Tsukuba 305-8562, Japan

Received 4 September 2003; published 29 March 2004

In a polar ferrimagnet GaFeO3, we have found a novel magneto-optical effect, termed x-ray nonreciprocal directional dichroism (XNDD), that the x-ray absorption at around the K edge of an Fe ion depends on whether the x-ray propagation vector is parallel or antiparallel to the outer product of the magnetization and electric-polarization vectors. The XNDD spectroscopy as demonstrated here can be a useful tool to probe the local magnetism in noncentrosymmetric systems such as magnetic interfaces and nanostructures.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.137401
DOI:
10.1103/PhysRevLett.92.137401
PACS:
78.70.Dm, 75.80.+q, 78.20.Ls

*Present address: Photon, Factory, Institute of Materials Structure Science, KEK, Tsukuba, 305-0801, Japan.

Electronic address: mkubota@post.kek.jp

†To whom correspondence should be addressed.

Electronic address: arima@ims.tsukuba.ac.jp

 
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