La 0.7 Ca 0.3 MnO 3薄膜の磁気抵抗に及ぼすFeドーピングの効果

概要

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Epitaxial thin films of La_<0.7>Ca_<0.3>Mn_<1-x>Fe_xO_3 (x=0,0.05 and 0.10) are grown on (001) LaAlO_3 substrates by pulsed laser deposition. The resistivity (ρ), the peak resistivity temperature (Tp), and the temperature coefficient of resistance (TCR=1/R dR/dT) are examined, and compared for the undoped and Fe-doped cases. Fe-doping depresses the Tp value significantly; from ∿266K for the undoped film to ∿181K for x=0.10 film, with a concomitant decrease in magnetization, reflecting extended influence of the dopant. The TCR shows a dramatic increase from ∿11%/K for the undoped film to ∿16%/K in the Fe-doped films. The saturation value of magnetization (M) shows a drastic decrease from 600emu/cm^3 for the undoped film to 300 emu/cm^3 for the 10% Fe-doped film. The Magnetoresistance (MR) shows slightly increase from 85% for the undoped film to 98% for the 10% Fe-doped film.
長崎大学の論文