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Ferromagnetic behaviour of ZnO: The role of grain boundaries

Straumal, Boris B.; Protasova, Svetlana G.; Mazilkin, Andrei A.; Goering, Eberhard; Schütz, Gisela; Straumal, Petr B.; Baretzky, Brigitte

Abstract:
The possibility to attain ferromagnetic properties in transparent semiconductor oxides such as ZnO is very promising for future spintronic applications. We demonstrate in this review that ferromagnetism is not an intrinsic property of the ZnO crystalline lattice but is that of ZnO/ZnO grain boundaries. If a ZnO polycrystal contains enough grain boundaries, it can transform into the ferromagnetic state even without doping with “magnetic atoms” such as Mn, Co, Fe or Ni. However, such doping facilitates the appearance of ferromagnetism in ZnO. It increases the saturation magnetisation and decreases the critical amount of grain boundaries needed for FM. A drastic increase of the total solubility of dopants in ZnO with decreasing grain size has been also observed. It is explained by the multilayer grain boundary segregation.


Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.3762/bjnano.7.185
ISSN: 2190-4286
KITopen ID: 1000068862
Erschienen in Beilstein journal of nanotechnology
Band 7
Heft 1
Seiten 1936-1947
Schlagworte ferromagnetism, grain boundaries, zinc(II) oxide (ZnO)
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