Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers

• Authors: S. Krompiewski , J. Pirnay , U. Krey , F. Süss
• Languages of publication: EN

Abstracts

EN

Within a tight-binding LMTO approach in the atomic sphere approximation we calculate the exchange interaction, J, between magnetic Fe slabs in a periodic multilayer arrangement m Fe/n Cu/ .... We concentrate on cases, where Cu adapts to the bcc structure of Fe. For the "open" (100)-interface our results suggest that a minimal number of m = 13 Fe monolayers per Fe slab is necessary to get antiferromagnetic coupling. For m = 16 we find antiferromagnetic coupling for 8 ≤ n ≤ 14, i.e. a long period of ca. 11 and a short period of 2 Cu monolayers. In contrast, for the (110)-interfaces, only a long period of 14 monolayers is found, i.e. the coupling is antiferromagnetic for 7 ≤ n ≤ 14 already for small values of m. We then model the roughness by mutual interchange of 50% of the Fe and Cu atoms, respectively, in the interface layers and find that, due to the interchange, the coupling constant J, as a function of the Cu-spacer thickness n, roughly shifts by half a mono-layer to the right. In the (100)-case, the short period gets washed out by the roughness.

Keywords

EN

75.70.Ak

Discipline

• 75.70.Ak: Magnetic properties of monolayers and thin films

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1994
• Volume: 85
• Issue: 2
• Pages: 475-478

Dates

published

1994-02

Contributors

author

S. Krompiewski

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

J. Pirnay

• Institute of Physics III, University of Regensburg, Germany

author

U. Krey

• Institute of Physics III, University of Regensburg, Germany

author

F. Süss

• Institute of Physics III, University of Regensburg, Germany

Identifiers

DOI

10.12693/APhysPolA.85.475