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The effect of Ge substitution in Ni2MnGa1–xGex Heusler alloys and films

✍ Scribed by I. Gościańska; J. Dubowik; Y. V. Kudryavtsev; A. Jezierski

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
164 KB
Volume
3
Category
Article
ISSN
1862-6351

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✦ Synopsis

Abstract

We present the results on the effect of adding Ge on the magnetic properties of Ni~2~MnGa~1–x~ Gex (0 < x < 0.4) alloys and thin films deposited by flash‐evaporation from the powdered alloys. It is found that the annealed alloys are single phase with L2~1~ ordering (cubic lattice constant a ≃ 0.581 nm). The Ge addition causes a drastic decrease in the martensitic transformation temperature from T ~M~ = 200 K (x = 0) to T ~M~ = 50 K (x = 0.4) with almost no effect on the Curie temperature T ~C~ ≃ 380 K and magnetization M ~S~ (0) ≃ 450–500 G. The magnetic properties of thin films strongly depend on ordering. The ordered films have similar L2~1~ (or B2) ordering and exhibit the magnetic properties similar to the properties of corresponding bulk alloys. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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