NDLI: Interfacial dominated ferromagnetism in nanograined ZnO: a μSR and DFT study

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Interfacial dominated ferromagnetism in nanograined ZnO: a μSR and DFT study

Content Provider	PubMed Central
Author	Tietze, Thomas Audehm, Patrick Chen, Yu–chun Schütz, Gisela Straumal, Boris B. Protasova, Svetlana G. Mazilkin, Andrey A. Straumal, Petr B. Thomas, Prokscha Luetkens, Hubertus Salman, Zaher Suter, Andreas Baretzky, Brigitte Fink, Karin Wenzel, Wolfgang Danilov, Denis Goering, Eberhard
Copyright Year	2015
Abstract	Diamagnetic oxides can, under certain conditions, become ferromagnetic at room temperature and therefore are promising candidates for future material in spintronic devices. Contrary to early predictions, doping ZnO with uniformly distributed magnetic ions is not essential to obtain ferromagnetic samples. Instead, the nanostructure seems to play the key role, as room temperature ferromagnetism was also found in nanograined, undoped ZnO. However, the origin of room temperature ferromagnetism in primarily non–magnetic oxides like ZnO is still unexplained and a controversial subject within the scientific community. Using low energy muon spin relaxation in combination with SQUID and TEM techniques, we demonstrate that the magnetic volume fraction is strongly related to the sample volume fraction occupied by grain boundaries. With molecular dynamics and density functional theory we find ferromagnetic coupled electron states in ZnO grain boundaries. Our results provide evidence and a microscopic model for room temperature ferromagnetism in oxides.
Related Links	http://dx.doi.org/10.1038/srep08871
Starting Page	8871
File Format	PDF
ISSN	20452322
e-ISSN	20452322
Journal	Scientific Reports
Volume Number	5
Language	English
Publisher	Nature Publishing Group
Access Restriction	Open
Rights Holder	Nature Publishing Group
Subject Keyword	Science and technology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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