Details

Autor(en) / Beteiligte

• Rao, K. V
• Sharma, Parmanand
• Gupta, Amita
• Owens, Frank J
• Sharma, Renu
• Ahuja, Rajeev
• Guillen, J. M. Osorio
• Johansson, Börje
• Gehring, G. A

Titel

Ferromagnetism above room temperature in bulk and transparent thin films of Mn-doped ZnO

Ist Teil von

• Nature materials, 2003-10, Vol.2 (10), p.673-677

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2003

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 mu(B) per ion. Our ab initio calculations find a valance state of Mn(2+) 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 microm 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 > 700 degrees C) 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.