Volume 104, Number 5, December 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 December 2013|
Reconsidering the possibility of room temperature ferromagnetism in Mn-doped zirconium oxide
1 Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology - D-76128 Karlsruhe, Germany
2 School of Engineering and Science, Jacobs University Bremen, Campus Ring 1 - D-28759 Bremen, Germany
3 Institut Lumière Matière, Université Lyon 1-CNRS - F-69622 Villeurbanne Cedex, France
Received: 5 July 2013
Accepted: 3 December 2013
The possibility to induce long-range ferromagnetic order by doping oxides with transition metal ions has become a very exciting challenge in the last decade. Theoretically, it has been claimed that Mn-doped ZrO2 could be a very promising spintronic candidate and that high critical temperatures could be already achieved even for a low Mn concentration. Some experiments have reported room temperature ferromagnetism (RT-FM) whilst some others only paramagnetism. When observed, the nature of RT-FM appears to be controversial and not clearly understood. In this study, we propose to clarify and shed light on some of theses existing issues. A detailed study of the critical temperatures and low-energy magnetic excitations in Mn-doped ZrO2 is performed. We show that the Curie temperatures were largely overestimated previously, due to the inadequate treatment of both thermal and transverse fluctuations, and disorder. It appears that the Mn-Mn couplings cannot explain the observed RT-FM. We argue, that this can be attributed to the interaction between large moments induced in the vicinity of the manganese. This is similar to the non-magnetic defect-induced ferromagnetism reported in oxides, semiconductors and graphene/graphite.
PACS: 75.47.Lx – Magnetic oxides / 75.10.-b – General theory and models of magnetic ordering / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EPLA, 2013
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