Physics – Condensed Matter – Materials Science
Scientific paper
2008-03-26
Eur. Phys. J. B 63, 437 (2008)
Physics
Condensed Matter
Materials Science
20 pages, 6 figures; details about background subtraction added to section III. (XMCD)
Scientific paper
10.1140/epjb/e2008-00252-4
The existence of semiconductors exhibiting long-range ferromagnetic ordering at room temperature still is controversial. One particularly important issue is the presence of secondary magnetic phases such as clusters, segregations, etc... These are often tedious to detect, leading to contradictory interpretations. We show that in our cobalt doped ZnO films grown homoepitaxially on single crystalline ZnO substrates the magnetism unambiguously stems from metallic cobalt nano-inclusions. The magnetic behavior was investigated by SQUID magnetometry, x-ray magnetic circular dichroism, and AC susceptibility measurements. The results were correlated to a detailed microstructural analysis based on high resolution x-ray diffraction, transmission electron microscopy, and electron-spectroscopic imaging. No evidence for carrier mediated ferromagnetic exchange between diluted cobalt moments was found. In contrast, the combined data provide clear evidence that the observed room temperature ferromagnetic-like behavior originates from nanometer sized superparamagnetic metallic cobalt precipitates.
Bauer Sebastian
Cezar Criginski J.
Goennenwein Sebastian T. B.
Gross Rudolf
Mader Werner
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