MR effects in half-metallic CrO/sub 2//MoO/sub 2/ mixtures

Mixtures of half metallic CrO/sub 2/ and metallic MoO/sub 2/ were prepared by ball milling. Specific magnetization /spl sigma/ and magneto-resistance (MR) were measured for (CrO/sub 2/)/sub 1-x/(MoO/sub 2/)/sub x/ for x=0 to 1. Above x=0.1,/spl sigma/ and MR-ratio (MRR) were monotonously decreased with increasing MoO/sub 2/ content. At x=0.05, enhancements of saturated magnetization /spl sigma//sub s/, remanent magnetization /spl sigma//sub r/, and coercive force H/sub c/ were observed. Slightly increasing MRR and spin polarization coefficient P were also found at x=0.05. These anomalous behaviors were possibly due to the difference of energy band structure of half-metallic CrO/sub 2/ and Pauli paramagnetic MoO/sub 2/ in the powder mixture system.