Observations of room temperature ferromagnetism (FM) in various pristine oxides have been reported recently. The findings have urged researchers to explore the origin of FM, but there is no uniform model to explain this issue so far. It is worth noting that at present, there have been no reports on the FM in one-dimensional (1D) SnO2 nanostructures. 1D SnO2 nanomaterials are expected to exhibit enhanced or novel physical properties due to the restricted size and higher surface area. Moreover, the Curie temperature in diluted magnetic semiconductors (DMS) nanowires can be much larger than that in corresponding bulk material due to the density of states of one-dimensional quantum wires. So we realize that it is important to reverify if the undoped SnO2 can become ferromagnetic under the nanowires form (i.e., a low dimension configuration, with a special environment for oxygen formation), and the real role that a transition metal doping can play in tailoring the magnetism of this system as well. So in this work, we have investigated the magnetic properties of pristine SnO2 and Cr-doped SnO2 nanowires and reveal the origin of FM. This is very important to their potential applications as basic components for assembling spin-based nanodevices.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites
Published: June 21, 2010
Pages: 156 - 159
Industry sector: Advanced Materials & Manufacturing
Topic: Materials Characterization & Imaging