イオン注入によるFe-Co合金超微粒子の形成とGMR特性

概要

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The Fe-Co nanoclusters in α-Al_2O_3 matrices were formed by sequential implantation of ^<57>Fe and ^<59>Co ions. The implantation was performed at room temperature up to a total dose of 2.0×10^<17>ions/cm^2 with a projectile energy of 100keV. The implanted amount of Co relative to Fe ions was adjusted to synthesize the granules with the Co concentrations of 0-60at.%. Conversion electron Mossbauer spectroscopy (CEMS) was used to investigate the dependence of hyperfine parameters in the clusters on the doses and Co concentrations. It has been found from the measurements that the Co substitution with ^<57>Fe in the clusters increases the magnetic moment of Fe atoms, showing the concentration dependence similar to the well known Slater-Pauling curve. It is demonstrated that the magnetoresistance (MR) ratio in the granules increases in consistence with the increase in the atomic magnetic moment. The X-ray analysis confirmed that the alloy clusters have bcc structures with the same lattice parameters as bulk Fe-Co alloys.
2004-06-20