Abstract
Temperature dependent magnetotransport measurements were performed on polycrystalline and epitaxial chromium dioxide (CrO2) nanowires fabricated using the selective-area growth technique. Polycrystalline nanowires showed a negative temperature coefficient of resistivity at low temperatures because of strong grain boundary scattering. The magnetoresistance (MR) value exhibited a width dependence, reaching a maximum of 20% for a 150nm wide wire. In contrast, the MR response of single crystal CrO2 wires was mainly determined by magnetocrystalline and shape anisotropy.
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