التفاصيل البيبلوغرافية
| العنوان: |
Oriented ferromagnetic Fe-Pt alloy nanoparticles produced in Al[sub 2]O[sub 3] by ion-beam synthesis. |
| المؤلفون: |
White, C. W., Withrow, S. P., Sorge, K. D., Meldrum, A., Budai, J. D., Thompson, J. R., Boatner, L. A. |
| المصدر: |
Journal of Applied Physics. 5/1/2003, Vol. 93 Issue 9, p5656. 14p. 5 Black and White Photographs, 1 Chart, 16 Graphs. |
| مصطلحات موضوعية: |
*NANOPARTICLES, *ALLOYS, *IRON, *PLATINUM |
| مستخلص: |
Oriented Fe[sub 1-x]Pt[sub x] nanoparticles have been formed in single-crystal Al[sub 2]O[sub 3] host matrices by the sequential implantation of Fe and Pt ions followed by thermal annealing. For x in the range of ∼35–55 at. % Pt, these nanoparticles are in the chemically ordered tetragonal L1[sub 0] structure of FePt and appear to be fully ordered. The nanoparticles are ferromagnetic, and the magnetic coercivity is a strong function of the alloy composition, reaching values in excess of 20 kOe for x∼45%. The crystallographic orientation and morphology of the nanoparticles are strongly dependent on the implantation conditions. Under certain implantation conditions, a buried amorphous layer can be formed in the Al[sub 2]O[sub 3] matrix which crystallizes during annealing giving rise to the formation of an interconnected network of large FePt particles with a single orientation. Oriented nanoparticles of Fe[sub 3]Pt and FePt[sub 3] were also synthesized. The Fe[sub 3]Pt and FePt[sub 3] particles have the ordered, cubic L1[sub 2] structure with an order parameter of 0.5–0.8; and these particles also exhibit ferromagnetic behavior. The magnetic and structural properties of the Fe[sub 1-x]Pt[sub x] nanoparticles are compared to and contrasted with those of nanoparticles of Fe and Pt in Al[sub 2]O[sub 3] that were also formed by ion-beam synthesis. Evidence for Al incorporation into the nanoparticles is also presented. © 2003 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
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