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Magnetic properties of Ni-Mn-Ga Heusler alloy films
Dubowik, J.,Goś,ciań,ska, I.,Kudryavtsev, Y. V.,Lee, Y. P.,Sová,k, P.,Konĉ,, M. WILEY-VCH Verlag 2006 Physica Status Solidi C Vol.3 No.1
<P>The films with composition Ni<SUB>x </SUB>Mn<SUB>y </SUB>Ga<SUB>z </SUB> (x = 50 ± 5, y = 25 ± 5, z = 25 ± 5) were deposited by flash-evaporation or sputtering on mica and glass substrates and annealed in a high vacuum at 673–973 K. X-ray diffraction at room temperature reveals the presence of B2 (or L2<SUB>1</SUB>) type of structure depending on annealing conditions. Magnetic properties were studied by ferromagnetic resonance at temperatures from 78 K to 400 K and compared with electric resistivity data. It is shown that the magnetic properties of the films critically depend on their structural ordering and microstructure. The films annealed at T < 800 K reveal a complex magnetic behavior due to their specific microstructure while those annealed at T > 800 K show magnetic properties comparable with those of bulk Ni-Mn-Ga alloys. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>