Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992321 | Journal of Alloys and Compounds | 2018 | 10 Pages |
Abstract
We present a magnetic and structural properties study of epitaxially grown B2-ordered full Heusler Co2FeSi0.5Al0.5 single crystal films on Ge(111) substrates, as a function of annealing temperature. Hysteresis loop measurements reveal that the magnetic properties of Co2FeSi0.5Al0.5 are stable up to 450â¯Â°C while ferromagnetic resonance linewidth measurements show a reduction of Gilbert damping from 5.6â¯Ãâ¯10â3 to 2.9â¯Ãâ¯10â3 for as-grown and annealed film, respectively. Above 500â¯Â°C, the films have increased coercivity, decreased saturation magnetisation, and show characteristic two-magnon scattering resonance line-shapes. Magnetic inhomogeneities developed within the film when annealed above 500â¯Â°C were correlated to significant interdiffusion at the film-substrate interface, as confirmed by scanning transmission electron microscopy and electron energy loss spectroscopy. By performing first-principles calculations based on atomistic models developed from atomically-resolved microscopy images, we show the magnetic moment of the Co2FeSi0.5Al0.5 film reduces upon Co substitution by Ge atoms.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Balati Kuerbanjiang, Christopher Love, Demie Kepaptsoglou, Zlatko Nedelkoski, Shinya Yamada, Arsham Ghasemi, Quentin M. Ramasse, Kohei Hamaya, Stuart A. Cavill, Vlado K. Lazarov,