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

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

Research output: Contribution to journalArticlepeer-review

1635 Citations (Scopus)

Abstract

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 μB 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 > 700°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.

Original languageEnglish
Pages (from-to)673-677
Number of pages5
JournalNature Materials
Volume2
Issue number10
DOIs
Publication statusPublished - 2003 Oct

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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