Growth mechanism and magnon excitation in NiO nanowalls
1 Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan
2 Department of Physics, Chung Yuan Christian University, Chungli 32023, Taiwan
3 National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
Nanoscale Research Letters 2011, 6:485 doi:10.1186/1556-276X-6-485Published: 8 August 2011
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.
PACS: 75.47.Lx; 61.82.Rx; 75.50.Tt; 74.25.nd; 72.10.Di