Abstract
Magneto-resistances (MR) were measured at 77 K and 300 K for spin-polarized half-metallic ferromagnet CrO2 nano-granular samples. They were prepared from the precursor of CrO3 in a micro-reactor at temperatures between 598K and 723K under oxygen gas pressures of 0.5 and 10 MPa. Room temperature MR ratios of -0.13 to -0.45% and 77 K MR ratios of -2.3 to -3.4% were observed for CrO2 with Cr2O5 and/or Cr2O3 impurities. The results showed that the Cr205 forms well tunnel barriers between CrO2 nano-grains, probably due to the weak magnetic property at 300K.
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