Abstract
Antiferromagnetic resonance (AFMR) in nanocrystalline nickel oxide samples having different average crystallite sizes ranging from ∼ 2–3 nm to ∼ 16–17 nm is studied using Fourier transform infrared spectroscopy. The well defined absorption peak at ∼ 34 cm − 1 in the spectra of all the samples is attributed to the bulk AFMR. The low frequency absorption peak in the region 20–30 cm − 1 in the spectra of samples with smaller average crystallite sizes is attributed to a surface mode. The size dependent variation of the spectral features is discussed on the basis of the large volume fraction of the surface atoms and the modified exchange interaction at the surface.
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