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Exchange Coupling and Magnetization Profiles of Binary and Ternary Magnetic Multilayers

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Süss F., Krey U., Krompiewski S.

Acta Physica Polonica A

1997

vol. 91

issue 2

281-284

Within a spin-polarized LMTO approach in the atomic-sphere approximation we calculate ab initio the magnetic properties of various binary and ternary multilayers composed of Fe, Co, Ni, Cr, V and Cu. The emphasis lies on the indirect exchange interaction of the magnetic sandwiches across the antiferromagnetic or non-magnetic spacers, and on the profiles of the intrinsic resp. induced magnetic moments. Among other results we find (i) that Ni is very sensitive on its neighborhood and that (ii) at the interface to Fe, V gets almost as strongly polarized as Cr, whereas in the interior layers, the V sandwich remains non-polarized.

Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers

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Krompiewski S., Pirnay J., Krey U., Süss F.

Acta Physica Polonica A

1994

vol. 85

issue 2

475-478

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.

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2 Acta Physica Polonica A

1 1997

1 1994

2 Krey U.

2 Krompiewski S.

2 Süss F.

1 Pirnay J.

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Exchange Coupling and Magnetization Profiles of Binary and Ternary Magnetic Multilayers

Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers