Single-crystalline AlGaN:Mn nanotubes and their magnetism

Han Kyu Seong, Youngho Lee, Jae Young Kim, Yun Ki Byeun, Kyong Sop Han, Jae Gwan Park, Heon Jin Choi

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Abstract

A new class of 1D DMS nanostructures, Mn-doped nanotubes that has advantages such as low dimensionality, nanoscale size and perfect single crystalinity was investigated. The nanotubes were grown on nickel-coated sapphire substrates by using a chloride chemical vapor deposition (CVD) process. The XRD pattern showed that the nanotubes have a wurtzite structure without any secondary phases. It was observed that the growth of nanotubes depends on the thickness of the catalyst coated on the substrates. The large catalysts on the substrates coated with 5 nm of Ni are slowly etched out and leave a liquid film and the temperature gradient across the catalyst results in the generation of low and high interfacial tension. It was observed from the XAS and XMCD analyses that the origin of ferromagnetism is not metallic but based on ionic Mn and modulation can provide a way toward the development of a new class of 1D DMS nanostructures.

Original languageEnglish
Pages (from-to)3019-3023
Number of pages5
JournalAdvanced Materials
Volume18
Issue number22
DOIs
Publication statusPublished - 2006 Nov 17

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Seong, H. K., Lee, Y., Kim, J. Y., Byeun, Y. K., Han, K. S., Park, J. G., & Choi, H. J. (2006). Single-crystalline AlGaN:Mn nanotubes and their magnetism. Advanced Materials, 18(22), 3019-3023. https://doi.org/10.1002/adma.200600933