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1 2003

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Magnetic properties of Fe/Si and Co/Si multilayers

Luciński T., Kopcewicz M., Hütten A., Brückl H., Heitmann S., Hempel T.

Materials Science

2003

Vol. 21, No. 1

25-37

The magnetic and structural properties of Fe/Si Fe/Fe33Si66 and Co/Si multilayers have been studied. Very strong AF coupling J=-1.93 mJ/m2 accompanied by saturation field of 1.5T has been found for dSi=1.4nm. The CEMS spectra recorded at room temperature consist of the Zeeman sextet characteristic of the pure Fe phase accompanied by two spectral components related to FeSi system: magnetic broad sextet and a quadrupole doublet. The broad sextet could originate from various Fe sites at the interface. The nonmagnetic QS doublet is most probably associated with the nonstoichiometric c-Fe1-xSix phase. Comparing the results obtained for Fe/Si and Fe/Fe33Si66 multilayers we conclude that the exchange coupling is distinctly stronger for nominally pure spacer layer. For Co/Si multilayers a very weak antiferromagnetic coupling and oscillatory FAF(dSi) behavior was observed most probably due to the Co-Si nonmagnetic metallic phases formation replacing the nominally pure Si spacer layers. We have shown that AF coupled Fe/Si multilayers can be successfully applied as an antiferromagnet in the magnetoresistive (Fe/Si)15/Fe/Co1/Cu/Co2 system.