Yin, S. ; Xu, M. ; Yang, L. ; Liu, J. ; Rösner, H. ; Hahn, H. ; Gleiter, H. ; Schild, D. ; Doyle, S. ; Liu, T. ; Hu, T. ; Takayama-Muromachi, E. ; Jiang, J. (2006)
Absence of ferromagnetism in bulk polycrystalline Zn0.9Co0.1O.
In: Physical Review B, 73 (22)
doi: 10.1103/PhysRevB.73.224408
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The atomic structure and the magnetic properties of 5 and 10 at. % Co-doped ZnO samples prepared by a high-pressure and high-temperature method have been investigated by various techniques, including x-ray diffraction with Rietveld refinements, scanning electron microscopy, high-resolution transmission electron microscopy, nanometer-sized element mapping, x-ray photoelectron spectroscopy, near-edge x-ray absorption fine structure, and extended x-ray absorption fine structure and magnetization measurements. It is found that Co ions with a valence of 2+ substitute Zn ions in the wurtzite ZnO structure. No metallic or oxidic Co-rich clusters were detected in the samples. If Co2+ ions substitute Zn2+ ions, no intrinsic ferromagnetism is observed in ZnO at doping levels up to 10 at. % Co even down to 5 K. A paramagnetic behavior with partially antiferromagnetic interactions is observed. Thus, in bulk Co-doped ZnO system any observation of ferromagnetism is probably due to small clusters of second phase materials. However, in thin films the situation might be more complex, since other extrinsic influences, such as strain or proximity effects, may modify the electronic and magnetic properties.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2006 |
| Autor(en): | Yin, S. ; Xu, M. ; Yang, L. ; Liu, J. ; Rösner, H. ; Hahn, H. ; Gleiter, H. ; Schild, D. ; Doyle, S. ; Liu, T. ; Hu, T. ; Takayama-Muromachi, E. ; Jiang, J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Absence of ferromagnetism in bulk polycrystalline Zn0.9Co0.1O |
| Sprache: | Englisch |
| Publikationsjahr: | 6 Juni 2006 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 73 |
| (Heft-)Nummer: | 22 |
| DOI: | 10.1103/PhysRevB.73.224408 |
| Kurzbeschreibung (Abstract): | The atomic structure and the magnetic properties of 5 and 10 at. % Co-doped ZnO samples prepared by a high-pressure and high-temperature method have been investigated by various techniques, including x-ray diffraction with Rietveld refinements, scanning electron microscopy, high-resolution transmission electron microscopy, nanometer-sized element mapping, x-ray photoelectron spectroscopy, near-edge x-ray absorption fine structure, and extended x-ray absorption fine structure and magnetization measurements. It is found that Co ions with a valence of 2+ substitute Zn ions in the wurtzite ZnO structure. No metallic or oxidic Co-rich clusters were detected in the samples. If Co2+ ions substitute Zn2+ ions, no intrinsic ferromagnetism is observed in ZnO at doping levels up to 10 at. % Co even down to 5 K. A paramagnetic behavior with partially antiferromagnetic interactions is observed. Thus, in bulk Co-doped ZnO system any observation of ferromagnetism is probably due to small clusters of second phase materials. However, in thin films the situation might be more complex, since other extrinsic influences, such as strain or proximity effects, may modify the electronic and magnetic properties. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 13 Feb 2013 10:00 |
| Letzte Änderung: | 05 Mär 2013 10:05 |
| PPN: | |
| Sponsoren: | The authors would like to thank BSRF in Beijing, NSRL in Hefei, ANKA and HASYLAB in Germany, MAXlab in Sweden, and SPring8 and KEK in Japan for use of the synchrotron radiation facilities., Financial support from the National Natural Science Foundation of China (Grants Nos. 50341032 and 50425102), the Ministry of Science and Technology of China (Grant Nos. 2004/249/37-14 and 2004/250/ 31-01A),, the Ministry of Education of China (Grant Nos. 2.005E+10 and 2005-55), Zhejiang University, and Grants-in- Aid for Scientific Research (B) from Japan Society for the Promotion of Science (16340111 and 16076209) are gratefully acknowledged., One of us �JZJ� is grateful for support from FZK. |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum