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X-ray magnetic circular dichroism characterization of GaN/Ga1-xMnxN digital ferromagnetic heterostructure

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11 Author(s)
Hwang, J.I. ; Department of Complexity Science and Engineering, University of Tokyo, Tokyo 113-0033, Japan and Department of Physics, University of Tokyo, Tokyo 113-0033, Japan ; Kobayashi, M. ; Song, G.S. ; Fujimori, A.
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The authors have investigated the magnetic properties of a GaN/Ga1-xMnxN (x=0.1) digital ferromagnetic heterostructure (DFH) showing ferromagnetic behavior using soft x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD). The Mn L2,3-edge XAS spectra were similar to those of Ga1-xMnxN random alloy thin films, indicating a substitutional doping of high concentration Mn into GaN. From the XMCD measurements, it was revealed that paramagnetic and ferromagnetic Mn atoms coexisted in the Ga1-xMnxN digital layers. Subtle differences were also found from the XMCD spectra between the electronic states of the ferromagnetic and paramagnetic Mn2+ ions. The ferromagnetic moment per Mn atom estimated from XMCD agreed well with that estimated from superconducting quantum interference device measurements, indicating that the ferromagnetic behavior of the GaN/Ga1-xMnxN DFH sample arises only from substitutional Mn2+ ions in the Ga1-xMnxN digital layers and not from ferromagnetic precipitates.

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Applied Physics Letters  (Volume:91 ,  Issue: 7 )