High temperature ferromagnetism in cubic Mn-doped ZrO(2) thin films

Theory has predicted that high temperature ferromagnetism (FM) should be found in cubic fake-diamonds, Mn-doped ZrO(2). Experimentally, it is shown that Mn-doped ZrO(2) ceramics are not ferromagnetic, but the nanosized Mn-doped ZrO(2) thin films grown on LaAlO(3) substrates can be ferromagnets with...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2012-09, Vol.324 (19), p.3013-3016
Main Authors: Hong, Nguyen Hoa, Park, Chul-Kwon, Raghavender, A T, Ruyter, Antoine, Chikoidze, Ekaterina, Dumont, Yves
Format: Article
Language:English
Subjects:
Ferromagnetism
Manganese
Nanocomposites
Nanomaterials
Nanostructure
Resistivity
Thin films
Zirconium dioxide
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Summary:Theory has predicted that high temperature ferromagnetism (FM) should be found in cubic fake-diamonds, Mn-doped ZrO(2). Experimentally, it is shown that Mn-doped ZrO(2) ceramics are not ferromagnetic, but the nanosized Mn-doped ZrO(2) thin films grown on LaAlO(3) substrates can be ferromagnets with T(c) above 400 K. The largest saturated magnetic moment (M(s)) is huge as of about 230 emu/cm(3) for the Mn(0.05)Zr(0.95)O(2) films, and it decreases as the Mn content increases. The intrinsic FM is strongly associated with the cubic structure of Mn-doped ZrO(2), and the Mn-Mn interactions via oxygen intermediates are important. No electrical conductivity is observed. Mn-doped ZnO(2) thin films can be truly considered as excellent candidates for spintronic applications.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2012.04.047