Electronic Origin of Giant Magnetic Anisotropy in Multiferroic ${\mathrm{LuFe}}_{2}{\mathbf{O}}_{4}$

Electronic Origin of Giant Magnetic Anisotropy in Multiferroic ${LuFe}_{2} O_{4}$

K.-T. Ko, H.-J. Noh, J.-Y. Kim, B.-G. Park, J.-H. Park, A. Tanaka, S. B. Kim, C. L. Zhang, and S-W. Cheong

Phys. Rev. Lett. 103, 207202 – Published 12 November 2009

Abstract

We investigated the orbital anisotropy of ${LuFe}_{2} O_{4}$ using the Fe $L_{2, 3}$ - and O $K$ -edge x-ray absorption spectroscopy (XAS) and cluster model calculations. X-ray magnetic circular dichroism reveals a surprisingly large orbital magnetic moment ( $m_{o} \sim 0.8 μ_{B} / f . u .$ ), which originates the giant magnetic anisotropy. The polarization dependent XAS enables us to identify the orbital states and occupations, different from the band calculation predictions. These findings were examined by using the cluster model analysis, which also explains the orbital magnetic moment as well as the total moment ( $2.9 μ_{B} / f . u .$ ). Taking into account the charge order, we also determined the spin structure.

Received 10 August 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.207202

Authors & Affiliations

K.-T. Ko¹, H.-J. Noh^2,*, J.-Y. Kim³, B.-G. Park^1,3, J.-H. Park^1,4,3,†, A. Tanaka⁵, S. B. Kim⁶, C. L. Zhang⁷, and S-W. Cheong^6,7

¹c_CCMR and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
²Department of Physics, Chonnam National University, Gwangju 500-757, Korea
³Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, Korea
⁴Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang 790-784, Korea
⁵Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
⁶l_PEM and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
⁷R-CEM and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

^*ffnhj@chonnam.ac.kr
^†jhp@postech.ac.kr

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Vol. 103, Iss. 20 — 13 November 2009

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Physical Review Letters

Electronic Origin of Giant Magnetic Anisotropy in Multiferroic LuFe2O4

K.-T. Ko, H.-J. Noh, J.-Y. Kim, B.-G. Park, J.-H. Park, A. Tanaka, S. B. Kim, C. L. Zhang, and S-W. Cheong

Phys. Rev. Lett. 103, 207202 – Published 12 November 2009

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Electronic Origin of Giant Magnetic Anisotropy in Multiferroic ${LuFe}_{2} O_{4}$