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Dynamical Diffraction Simulations in FePt—I

  • Karen L. Torres (a1), Richard R. Vanfleet (a2) and Gregory B. Thompson (a1)


A series of multislice simulations to quantify the effect of various degrees of order, composition, and thickness on the electron diffracted intensities were performed using the L10 FePt system as the case study. The dynamical diffraction studies were done in both a convergent electron beam diffraction and selected area electron diffraction condition. The L10 symmetry demonstrated some peculiar challenges in the simulation, in particular between the {111} plane normal and the ⟨111⟩ direction, which are not equivalent because of tetragonality. A hybrid weighting function atom of Fe-Pt was constructed to account for S < 1 or nonequiatomic compositions. This statistical approach reduced the complexity of constructing a crystal with the probability that a particular atom was at a particular lattice site for a given order parameter and composition. Considerations of accelerating voltage, convergent angle, and thermal effects are discussed. The simulations revealed significant differences in intensity ratios between films of various compositions but equivalent unit cell numbers and degree of order.


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Barmak, K., Kim, J., Berry, D.C., Hanani, W.N., Wierman, K., Svedberg, E.B. & Howard, J.K. (2005a). Calorimetric studies of the A1 to L10 transformation in binary FePt thin films with compositions in the range of 47.5–54.4 at.% Fe. J Appl Phys 97, 024902.
Barmak, K., Kim, J., Lewis, L.H., Coffey, K.R., Toney, M.F., Kellock, A.J. & Thiele, J.-U. (2005b). On the relationship of magnetocrystalline anisotropy and stoichiometry in epitaxial L10 CoPt (001) and FePt (001) thin films. J Appl Phys 98, 033904.
Cowley, J.M. & Moodie, A.F. (1957). The scattering of electrons by atoms and crystals. I. A new theoretical approach. Acta Cryst 10, 609619.
Cowley, J.M. & Spence, J.C.H. (1979). Innovative imaging and microdiffraction in stem. Ultramicroscopy 3, 433438.
Denton, A.R. & Ashcroft, N.W. (1991). Vegard's Law. Phys Rev A 43, 31613164.
Kanazawa, H., Lauhoff, G. & Suzuki, T. (2000). Magnetic and structural properties of (CoxFe100−x)50Pt50 alloy thin films. J Appl Phys 87, 61436145.
Kirkland, E.J. (1998). Advanced Computing in Electron Microscopy. New York: Plenum.
Laughlin, D.E., Srinicasan, K., Tanase, M. & Wang, L. (2005). Crystallographic aspects of L10 magnetic materials. Scripta Mater 53, 383388.
Lyubina, J., Isnard, O., Gutfleisch, O., Müller, K.-H. & Schultz, L. (2006). Ordering of nanocrystalline Fe-Pt alloys studied by in situ neutron powder diffraction. J Appl Phys 100, 094308-1094308-9.
Mitani, S., Takanashi, K., Sano, M., Fujimori, H., Osawa, A. & Nakajima, H. (1995). Perpendicular magnetic anisotropy and magneto-optical Kerr rotation in FePt (001) monoatomic multilayers. J Magn Magn Mater 148, 163164.
Okamoto, S., Kikuchi, N., Kitakami, O., Miyazaki, T., Shimada, Y. & Fukamichi, K. (2002). Chemical-order-dependent magnetic anisotropy and exchange stiffness constant of FePt (001) epitaxial films. Phys Rev B 66, 024413-1024413-9.
Petrova, R.V., Vanfleet, R.R., Richardson, D., Yao, B. & Coffey, K.R. (2005a). Characterization of individual L10 FePt nanoparticles. IEEE Trans Magn 40, 32023204.
Petrova, R.V., Vanfleet, R.R., Richardson, D.R, Yao, B. & Coffey, K.R. (2005b). Convergent beam electron diffraction of ordered L10 nanoparticles. Microsc Microanal 11, 782783.
Warren, B.E. (1990). X-Ray Diffraction, pp. 208210. New York: Dover Publications.
Weller, D. & Doerner, M.F. (2000). Extremely high-density longitudinal magnetic recording media. Annu Rev Mater Sci 30, 611644.



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