Magnetic Properties of TiO2 Based Nanotubes.

The Ti NMR and the field swept pulsed EPR spectra of bulk powder anatase TiO2 and TiO2 based nanotubes have been found to be radically different. The same is true for the magnetic properties measured by SQUID. Whereas no EPR line could be detected for the TiO2 powder, a rather strong temperature dependent line has been seen for TiO2 based nanotubes. The magnetization versus magnetic field curve of uncompressed TiO2 based nanotubes at 5 K shows the presence of a huge jump-wise increase in the magnetization at about 4 T, which disappears at 1 T as well as in the compressed sample. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]