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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.

Influence of the interface roughness on the interlayer coupling in magnetic superlattices

Bąk Z.

Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

2001

Vol. 5

109--113

The interface roughness disturbs the planar geometry and the restraint conditions imposed (by interface potentials) on the motion of the mobile charge carriers create deviation from integral (spectral) dimensionality. In our contribution we calculate the interlayer coupling that accounts for the fractional dimensionality and show that effect interface roughness on the interlayer coupling can be accounted for by an exchange-like term which exhibits π/2 phase shift with respect to the conventional interlayer coupling derived for ideally fiat interfaces.