The paper has highlighted important findings of reversible room temperature ferromagnetism in TiO2 system concluded to be induced mainly due to oxygen vacancies.1
The concern presented here is regarding Fig. 5 presenting the Co XPS data and the concern is that the background features look somewhat identical despite a clear shift in one of the spectra. The following Erratum is submitted, with sincere apologies to the readers, to point out possible unnoticed mistake on our part.
The Co XPS signal (unlike the Ti 2p) was very poor due to low Co content (5%). After data correction and normalization, the smoothing (FFT) was performed, as usual, and the best fitted profiles were obtained. We should have shown just these profiles in the paper, but, unfortunately, to make the (yet) weak signal more visible we wrongfully subtracted the background spectrum (in the Co binding energy range) from the best fitted profiles of these spectra. Though it enhanced the signal but as a result the noise features now look somewhat similar in these spectra which were a mistake. We are very sorry for not mentioning this earlier in the paper which might have created confusions.
Further, to look in to this problem more thoroughly and precisely we would repeat the experiments at the soonest with fresh samples, since the samples prepared long back have lost their properties and the complete process of synthesis, characterization of materials, measurements, and the analysis of data may take several months, hence, this Erratum with sincere apologies to the esteemed readers.
