Affiliations: [a] Institute of Molecular Physics, Polish Academy of
Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland | [b] Institute for Metal Physics, National Academy of
Sciences of Ukraine, 36 Vernadsky Ave, 03142 Kiev, Ukraine | [c] Deptartment of Physics, A. Mickiewicz University,
Umultowska 85, 61-614 Poznań, Poland
Correspondence:
[*]
Corresponding author: J. Dubowik, Institute of Molecular
Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań,
Poland. Tel.: +48 618 695 191; Fax: +48 618 684 524; E-mail:
[email protected]
Abstract: We report results of ferromagnetic resonance measurements on
sputtered
Ni_{x}Mn_{y}Ga_{z}
films of various compositions annealed from 620–973 K. Anomalous magnetic
behavior of the Ni-Mn-Ga films annealed at T<800 K results from their
columnar microstructure and changes in the magnetic anisotropy due to the
martensitic transformation. The films annealed at the highest temperatures have
the magnetic behavior typical of normal ferromagnetic films, in which the
effect of the martensitic transformation is strongly reduced due to constraint
of a substrate.
Keywords: Magnetic shape memory alloys, thin films, ferromagnetic resonance
