Reversed interface effects in amorphous FeZr/AlZr multilayers

We report an anomalous enhancement of the critical temperature (T-c) when the thickness (d) of the magnetic layer is decreased from 60 to 20 angstrom in amorphous FeZr/AlZr multilayers. Further reduction of the thickness causes a decrease of T-c, as expected by finite-size scaling, while the magnetic moment decreases monotonically for all values of d. The increase of the critical temperature is attributed to a reversed interface effect where local changes in the nearest-neighbor distance and coordination number gives a higher effective magnetic coupling at the interfaces compared to the interior of the layer. We have successfully described the results within a model where such interface effects are combined with finite-size scaling.

Zamani, AtiehUppsala universitet,Materialfysik(Swepub:uu)atiza376 (author)
Östman, ErikUppsala universitet,Materialfysik(Swepub:uu)erios785 (author)
Fashandi, HosseinUppsala universitet,Materialfysik (author)
Hjörvarsson, BjörgvinUppsala universitet,Materialfysik(Swepub:uu)bjorghvs (author)
Jönsson, Petra E.Uppsala universitet,Materialfysik(Swepub:uu)pjo09369 (author)
Uppsala universitetMaterialfysik (creator_code:org_t)

In:Physical Review B. Condensed Matter and Materials Physics90:18, s. 184403-1098-01211550-235X

By the author/editor: Ahlberg, Martina; Zamani, Atieh; Östman, Erik; Fashandi, Hossei ...; Hjörvarsson, Bjö ...; Jönsson, Petra E ...

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