Detection of Fe 3d electronic states in valence band and magnetic properties of Fe-doped ZnO film

doi:10.1088/1674-1056/22/2/026101

Abstract Fe-doped ZnO film has been grown by laser molecular beam epitaxy (L-MBE) and structurally characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), all of which reveal the high quality of the film. No secondary phase was detected. Resonant photoemission spectroscopy (RPES) with photon energies around the Fe 2p-3d absorption edge is performed to detect the electronic structure in the valence band. A strong resonant effect at a photon energy of 710 eV is observed. Fe³⁺ is the only valence state of Fe ions in the film and the Fe 3d electronic states are concentrated at binding energies of about 3.8 eV and 7 eV～ 8 eV. There are no electronic states related to Fe near the Fermi level. Magnetic measurements reveal a typical superparamagnetic property at room temperature. The absence of electronic states related to Fe near the Fermi level and the high quality of the film, with few defects, provide little support to ferromagnetism.

Keywords: Fe-doped ZnO laser molecular beam epitaxy resonant photoemission spectroscopy superparamagnetism

Received: 09 May 2012
Revised: 22 August 2012
Accepted manuscript online:

PACS:	61.05.cp	(X-ray diffraction)
	68.37.Hk	(Scanning electron microscopy (SEM) (including EBIC))
	73.61.Ga	(II-VI semiconductors)
	75.50.Pp	(Magnetic semiconductors)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10775126 and 10975138).

Corresponding Authors: Xu Fa-Qiang
E-mail: fqxu@ustc.edu.cn

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Chen Tie-Xin (陈铁锌), Cao Liang (曹亮), Zhang Wang (张旺), Han Yu-Yan (韩玉岩), Zheng Zhi-Yuan (郑志远), Xu Fa-Qiang (徐法强), Ibrahim Kurash (奎热西), Qian Hai-Jie (钱海杰), Wang Jia-Ou (王嘉鸥 ) Detection of Fe 3d electronic states in valence band and magnetic properties of Fe-doped ZnO film 2013 Chin. Phys. B 22 026101

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Detection of Fe 3d electronic states in valence band and magnetic properties of Fe-doped ZnO film

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