Title :
MR effects in half-metallic CrO2/MoO2 mixtures
Author :
Kimishima, Yoshihide ; Satoh, Yuya ; Yamada, Waka ; Uehara, Masatomo ; Sasaki, Toshiki
Author_Institution :
Dept. of Phys., Yokohama Nat. Univ., Japan
Abstract :
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 σs, remanent magnetization σr, and coercive force Hc 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.
Keywords :
ball milling; chromium compounds; coercive force; electron spin polarisation; magnetic particles; magnetoresistance; molybdenum compounds; paramagnetic materials; remanence; CrO2; MR effects; MoO2; Pauli paramagnetic material; ball milling; coercive force; electron spin polarization; half-metallic mixtures; magnetic particles; magnetoresistance; paramagnetic materials; powder mixture system; remanence; remanent magnetization; saturated magnetization; specific magnetization; spin polarization coefficient; Ball milling; Chromium; Electrons; Impurities; Optical polarization; Paramagnetic materials; Physics; Powders; Saturation magnetization; X-ray diffraction; Dioxide; half-metal; magnetization; magneto-resistance;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854825
