Electronic structure and magnetism of the diluted magnetic semiconductor Fe-doped ZnO nanoparticles

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3294620· OSTI ID:21476128

Kataoka, T; Kobayashi, M; Sakamoto, Y; Song, G S ^[1]; Fujimori, A ^[1]; Chang, F -H; Lin, H -J; Huang, D J; Chen, C T ^[2]; Ohkochi, T; Takeda, Y; Okane, T; Saitoh, Y ^[3]; Yamagami, H ^[3]; Tanaka, A ^[4]; Mandal, S K; Nath, T K ^[5]; Karmakar, D ^[6]; Dasgupta, I ^[7]

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1. Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan)
2. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)
3. Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Sayo-gun, Hyogo 679-5148 (Japan)
4. Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530 (Japan)
5. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302 (India)
6. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Center, Mumbai 400085 (India)
7. Department of Solid State Physics and Center for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur Kolkata 700032 (India)

We have studied the electronic structure of Fe-doped ZnO nanoparticles, which have been reported to show ferromagnetism at room temperature, by x-ray photoemission spectroscopy, resonant photoemission spectroscopy, x-ray absorption spectroscopy, and x-ray magnetic circular dichroism (XMCD). From the experimental and cluster-model calculation results, we find that Fe atoms are predominantly in the Fe{sup 3+} ionic state with mixture of a small amount of Fe{sup 2+} and that Fe{sup 3+} ions are dominant in the surface region of the nanoparticles. It is shown that the room temperature ferromagnetism in the Fe-doped ZnO nanoparticles primarily originated from the antiferromagnetic coupling between unequal amounts of Fe{sup 3+} ions occupying two sets of nonequivalent positions in the region of the XMCD probing depth of {approx}2-3 nm.

• OSTI ID: 21476128
• Journal Information: Journal of Applied Physics, Vol. 107, Issue 3; Other Information: DOI: 10.1063/1.3294620; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ANTIFERROMAGNETISM
COUPLING
DOPED MATERIALS
ELECTRONIC STRUCTURE
FERROMAGNETIC MATERIALS
FERROMAGNETISM
IRON
IRON IONS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC SEMICONDUCTORS
NANOSTRUCTURES
PARTICLES
PHOTOEMISSION
SURFACES
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTRA
X-RAY SPECTROSCOPY
ZINC OXIDES
CHALCOGENIDES
CHARGED PARTICLES
DICHROISM
ELECTRON SPECTROSCOPY
ELEMENTS
EMISSION
IONS
MAGNETIC MATERIALS
MAGNETISM
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
SECONDARY EMISSION
SEMICONDUCTOR MATERIALS
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENTS
ZINC COMPOUNDS