Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Exchange Bias und Coupling

MA 20.10: Vortrag

Freitag, 15. März 2002, 12:45–13:00, H10

Antiferromagnetic interlayer exchange coupling in MBE-grown Fe/Fe1−xSix/Fe structures — •Rashid R. Gareev, Daniel E. Bürgler, Matthias Buchmeier, Reinert Schreiber, and Peter Grünberg — IFF, Forschungszentrum Jülich GmbH

Epitaxial Fe/Fe1−xSix/Fe (0.4 < x < 1) sandwiches with wedge-shaped spacers are grown by molecular beam epitaxy. Codeposition of Fe and Si at controlled atomic fluxes yields the desired nominal Si content x. Metallic-type iron-silicide [1] boundary layers (BL) are inserted at interfaces to suppress interdiffusion. Well-defined LEED patterns indicate epitaxial growth of the whole structure. The contributions of the bilinear and biquadratic coupling terms to interlayer exchange coupling J are determined from MOKE hysteresis loops and Brillouin light scattering. The coupling strength drastically increases with Si content and reaches values of |J|≈ 6 mJ/m2 for a nominally pure Si spacer [2]. Inserting BL leads to a further increase of the interlayer coupling exceeding 8 mJ/m2. This value is one of the largest ever reported. The increase of the coupling strength is accompanied by a shift of the coupling maximum to a smaller spacer thickness. We conclude that inserting of BL suppresses pin-hole formation and enables antiferromagnetic exchange coupling at a smaller spacer thickness. Together with the exponential dependence of the coupling on spacer thickness this results in even stronger coupling.
R.R. Gareev, D.E. Bürgler, D. Olligs, M. Buchmeier, R. Schreiber, P. Grünberg, Phys. Rev. Lett. 87, 157202 (2001).
R.R. Gareev, D.E. Bürgler, M. Buchmeier, R. Schreiber, P. Grünberg, J. Magn. Magn. Mater., in press (2001).

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