X-ray Magnetic Circular Dichroism Investigations of the Origin of Room Temperature Ferromagnetism in Fe-Doped ZnO Nanoparticles
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概要
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We have studied the electronic structure of Zn0.9Fe0.1O nanoparticles, which have been reported to be ferromagnetic at room temperature, by using soft X-ray absorption (XAS) and magnetic circular dichroism (XMCD). The XAS results indicate that Fe ions are predominantly in the Fe3+ state with mixture of a small amount of Fe2+. It is shown that the room temperature ferromagnetism in the Zn0.9Fe0.1O nanoparticles is primarily originated from the antiferromagnetic coupling between unequal amounts of Fe3+ ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of ${\sim}2--3$ nm.
- 2009-04-25
著者
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Kataoka Takashi
Department Of Agricultural Engineering Faculty Of Agriculture Iwate University
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Fujimori Atsushi
Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo
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Kobayashi Masaki
Department Of Biology School Of Education Waseda University
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Song Gyong
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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Kataoka Takashi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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Sakamoto Yuta
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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Chang Fan-Hsiu
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Lin Hong-Ji
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Huang Di
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Chen Chien
National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
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Mandal Sanjay
Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India
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Nath Tapan
Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India
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Karmakar Debjani
Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, Mumbai 400085, India
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Dasgupta Indra
Department of Solid State Physics and Center for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Fujimori Atsushi
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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Kobayashi Masaki
Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Josai University
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Kobayashi Masaki
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
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