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Structural and magnetoresistive properties of mechanically alloyed Fe-Co-Ag

Cohen, NS; Pankhurst, QA; Barquin, LF; (1999) Structural and magnetoresistive properties of mechanically alloyed Fe-Co-Ag. J PHYS-CONDENS MAT , 11 (45) 8839 - 8853.

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Abstract

The structural, magnetic and magnetoresistive properties of a wide range of mechanically alloyed Fe-Co-Ag granular materials were investigated by means of x-ray diffraction, Mossbauer spectroscopy, differential scanning calorimetry, DC magnetometry and magnetoresistance measurements. Binary Fe-Co alloys, milled using Syalon containers, showed a mixed fcc-bcc structure for Fe compositions between 20 and 25 at.%. The ternary alloys were found to comprise dispersions of Fe-Co grains in an fee silver matrix, with the structure and magnetic properties of the Fe-Co grains mirroring those of the corresponding binary Fe-Co alloys. For materials with Fe-Co ratios in the region of the mixed fcc-bcc phases, additional components were noted in their Mossbauer spectra (a secondary sextet and a paramagnetic doubler, accounting for up to 63% of the spectral area), indicating the intermixing of a significant number of small Fe-Co clusters or fine grains into the Ag matrix. Alloys in this region were also found to have the largest magnetoresistive responses, with the maximum being a 5.8% effect in (Fe0.15Co0.85)(30)Ag-70, as measured at 10 K in a field of 3 T. This indicates the dominant significance of fine grain intermixing in these alloys.

Type: Article
Title: Structural and magnetoresistive properties of mechanically alloyed Fe-Co-Ag
Keywords: GIANT MAGNETORESISTANCE, MAGNETIC-PROPERTIES, FILMS, CU, COBALT
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/59489
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