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Applied Physics Letters / Volume 92 / Issue 5 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 92, 052508 (2008); http://dx.doi.org/10.1063/1.2841819 (3 pages)

Structures and magnetic properties of (Fe, Li)-codoped NiO thin films

Wensheng Yan1, Weixiang Weng1, Guobin Zhang1, Zhihu Sun1, Qinghua Liu1, Zhiyun Pan1, Yuxian Guo1, Pengshou Xu1, Shiqiang Wei1, Yunpeng Zhang2, and Shishen Yan2

1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People’s Republic of China
2School of Physics and Microelectronics, Shandong University, Jinan, Shandong 250100, People’s Republic of China

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(Received 18 October 2007; accepted 21 January 2008; published online 7 February 2008)

Rock-salt structured single-phase Ni0.98Fe0.02O and Ni0.93Fe0.02Li0.05O thin films with room temperature ferromagnetism were grown by pulsed laser deposition. It is found that the Li codoping into Ni0.98Fe0.02O significantly increases the saturation magnetic moment by a factor of 2, i.e., from 0.32μB/Fe rising to 0.67μB/Fe. The x-ray absorption fine structure spectral analyses at Fe and O K edge reveal that in both samples, the impurities are substitutionally incorporated into the NiO host. The first-principles calculations show that substitutionally doping Li ions into NiO leads to a strong hybridization between the Fe 3d states and the spin-split acceptor band at the Fermi level. As a result, the Fe 3d electron configuration is altered and the effective magnetic moment per Fe ion is enhanced.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

ab initio calculations, Fermi level, ferromagnetism, impurities, iron, lithium, magnetic moments, magnetic thin films, nickel compounds, pulsed laser deposition, semiconductor thin films, semimagnetic semiconductors, XANES

PACS

  • 75.70.Ak

    Magnetic properties of monolayers and thin films

  • 68.55.-a

    Thin film structure and morphology

  • 81.15.Fg

    Pulsed laser ablation deposition

  • 75.30.Cr

    Saturation moments and magnetic susceptibilities

  • 78.70.Dm

    X-ray absorption spectra

  • 75.50.Pp

    Magnetic semiconductors

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2841819

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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