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Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO
KTH, Superseded Departments, Materials Science and Engineering.
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2003 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 2, no 10, 673-677 p.Article in journal (Refereed) Published
Abstract [en]

The search for ferromagnetism above room temperature in dilute magnetic semiconductors has been intense in recent years. We report the first observations of ferromagnetism above room temperature for dilute (<4 at.%) Mn-doped ZnO. The Mn is found to carry an average magnetic moment of 0.16 μ(B) per ion. Our ab initio calculations find a valance state of Mn2+ and that the magnetic moments are ordered ferromagnetically, consistent with the experimental findings. We have obtained room-temperature ferromagnetic ordering in bulk pellets, in transparent films 2-3 μm thick, and in the powder form of the same material. The unique feature of our sample preparation was the low-temperature processing. When standard high-temperature (T>700degreesC) methods were used, samples were found to exhibit clustering and were not ferromagnetic at room temperature. This capability to fabricate ferromagnetic Mn-doped ZnO semiconductors promises new spintronic devices as well as magneto-optic components.

Place, publisher, year, edition, pages
2003. Vol. 2, no 10, 673-677 p.
Keyword [en]
magnetic-properties, semiconductors, energy
URN: urn:nbn:se:kth:diva-22870DOI: 10.1038/nmat984ISI: 000185767200014OAI: diva2:341568
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rao, K. V.Ahuja, RajeevJohansson, Börje
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