Nanocomposites and nanomaterials

Linking Between Magnetoelastic and Damping Properties of Co Based Heusler Alloys Thin Films
O. Chumak1, 2, A. Pacewicz3, A. Nabiałek2, B. Salski3, T. Yamamoto4, T. Seki4,5, K. Takanashi4, 5, L. T. Baczewski2, H. Szymczak2
1 Donets Institute for Physics and Engineering named after O.O. Galkin of the NAS of Ukraine. Prospect Nauki, 46, Kyiv-03680, Ukraine. 
E-mail: chumak@ifpan.edu.pl
2 Institute of Physics Polish Academy of Sciences, Al. Lotnikow 32/46, Warsaw-02-668, Poland.
3 Institute of Radioelectronics and Multimedia Technology, Warsaw University of Technology, Nowowiejska 15/19, Warsaw-00-665, Poland.
4 Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-980-8577, Japan.
5 Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-980-8577, Japan.

The series of half-metallic Co2FexMn1-xSi (CFMS) Heusler alloys epitaxial thin films with the thickness of about 30 nm were investigated to determine the composition influence on magnetoelastic and damping properties. Magnetoelastic constant as well as Gilbert damping factor dependencies versus magnetic layer composition were obtained. Magnetoelastic constant was found to be in the range 5-25 106 erg/cm3, with corresponding magnetostriction coefficient λ of about 6-30 10-6, and Gilbert damping factor in the range 2-6 10-3. Correlations between the last two parameters were considered. Both parameters have small values, which is expected for CFMS magnetic layers as for representative of materials for both spintronic and magnonic applications. Magnetoelastic constants have similar values range as for Co2Fe0.4Mn0.6Si thin films with thickness in the range 15-50 nm [1].

1.	Chumak O.M. et al, Magnetoelastic Properties of Epitaxially Grown Co2Fe0.4Mn0.6Si and Co2FeGa0.5Ge0.5 Heusler Alloys Thin Films // IEEE Trans. Magn.-2017.-53.-P. 2501906.