Abstract
Nanometer-sized clusters of Fe–Co alloy in α-Al2O3 matrices were synthesized by sequential implantation of Fe and Co ions. The implantations were performed at room temperature with a total dose of around (1.2–1.5)×1017ions∕cm2 with ion energy of 100keV. It is demonstrated for the Fe–Co granular layers that the alloying improves the tunneling-type magnetoresistance (TMR) effect and results in an eminent increase of the MR ratio to the value of 13.2% at an external field of 1.1T at room temperature. The magnetic property of the Fe–Co granules was investigated by means of conversion electron Mössbauer spectroscopy at room temperature and 4.2K. It is shown that the enhancement of the TMR effect in the Fe–Co granules is correlated with the granule size, its dispersion in the insulating matrix, and the magnetic characteristics in the granular layers.
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