Growth mechanism and magnon excitation in NiO Nanowalls

Ashish Chhaganlal Gandhi, Chih Yeh Huang, Chun Chuen Yang, Ting Shan Chan, Chia Liang Cheng, Yuan Ron Ma, Sheng Yun Wu

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Abstract

The nanosized effects of short-range multimagnon excitation behavior and short-circuit diffusion in NiO nanowalls synthesized using the Ni grid thermal treatment method were observed. The energy dispersive spectroscopy mapping technique was used to characterize the growth mechanism, and confocal Raman scattering was used to probe the antiferromagnetic exchange energy J2 between next-nearest-neighboring Ni ions in NiO nanowalls at various growth temperatures below the Neel temperature. This study shows that short spin correlation leads to an exponential dependence of the growth temperatures and the existence of nickel vacancies during the magnon excitation. Four-magnon configurations were determined from the scattering factor, revealing a lowest state and monotonic change with the growth temperature.

Original languageEnglish
Article number485
Pages (from-to)1-14
Number of pages14
JournalNanoscale Research Letters
Volume6
DOIs
StatePublished - 2011

Keywords

  • Confocal Raman scattering
  • Magnetic oxides
  • Magnon excitation
  • Nanocrystalline materials
  • Short-circuit diffusion

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