Search results

1

CPP-Giant Magnetoresistance and Thermoelectric Power of Multilayers

100%

Krompiewski S., Krey U.

Acta Physica Polonica A

|

1997

|

vol. 91

|

issue 1

221-224

EN

Oscillations of magnetoresistance and thermoelectric power vs. both nonmagnetic spacer and ferromagnetic slab thicknesses are studied in the current-perpendicular-to-plane geometry, in terms of the single-band tight-binding model. The spin-dependent conductance was calculated from the Kubo formula by means of a recursion Green function technique, and the thermoelectric power directly from the well-known Onsager relations. In general, the observed oscillations may have either just one or two periods. In the latter case the long period of oscillations, related to spectacular beats, is apparently of non-RKKY type. The relative thermoelectric power oscillations are strongly enhanced in comparison with those of the giant magnetoresistance, have the same periods, but different phases and a negative bias.

2

Exchange Coupling and Magnetization Profiles of Binary and Ternary Magnetic Multilayers

81%

Süss F., Krey U., Krompiewski S.

Acta Physica Polonica A

|

1997

|

vol. 91

|

issue 2

281-284

EN

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.

3

Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers

81%

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

Acta Physica Polonica A

|

1994

|

vol. 85

|

issue 2

475-478

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.

Refine search results

3 Acta Physica Polonica A

2 1997

1 1994

3 Krey U.

3 Krompiewski S.

2 Süss F.

1 Pirnay J.

CPP-Giant Magnetoresistance and Thermoelectric Power of Multilayers

Exchange Coupling and Magnetization Profiles of Binary and Ternary Magnetic Multilayers

Calculation of Oscillatory Exchange in bcc-Fe/Cu Multilayers