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Nanotechnology. 2012 Feb 24;23(7):075704. doi: 10.1088/0957-4484/23/7/075704. Epub 2012 Jan 20.

Magnetic stability of SnO₂ nanosheets.

Author information

1
International Center for New-Structured Materials (ICNSM), Zhejiang University and Laboratory of New-Structured Materials (LNSM), Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.

Abstract

Room temperature ferromagnetism has been observed in freshly synthesized and post-annealed SnO₂ nanosheets. The results of x-ray diffraction and x-ray photoelectron spectroscopy reveal that the newly synthesized samples and those annealed at 400 °C under either an O₂ or Ar atmosphere possess rutile structure and no other impurity phases are observed. The fitting results of the O 1s and Sn 3d spectra from SnO₂ samples annealed at 400 °C under an O₂ or Ar atmosphere both indicate that oxygen vacancies inevitably exist in these samples. It is found that the saturation magnetization of all the annealed samples does not feature mono-dependence on oxygen vacancies, whereas an Sn vacancy related origin seems more plausible to account for variations in the magnetization of samples studied. This finding corresponds to first-principle calculation results from our previous work. Furthermore, the Curie temperature of SnO₂ nanosheets was estimated to be around 300 °C, rendering it a very good option for the next generation of spintronics.

PMID:
22261409
DOI:
10.1088/0957-4484/23/7/075704
[Indexed for MEDLINE]
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