MR effects in half-metallic CrO2/MoO2 mixtures

Mixtures of half metallic CrO₂ and metallic MoO₂ were prepared by ball milling. Specific magnetization σ and magneto-resistance (MR) were measured for (CrO₂)_1-x(MoO₂)_x for x=0 to 1. Above x=0.1,σ and MR-ratio (MRR) were monotonously decreased with increasing MoO₂ content. At x=0.05, enhancements of saturated magnetization σ_s, remanent magnetization σ_r, and coercive force H_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 CrO₂ and Pauli paramagnetic MoO₂ in the powder mixture system.