We investigated the structural and magnetic properties of Co 2 MnSi deposited on Co 90 Fe 10 and Co 50 Fe 50 ferromagnetic seed-layers at room temperature before and after annealing at various temperatures up to 500 °C. The lattice misfits between Co 2 MnSi and Co 90 Fe 10 and between Co 2 MnSi and Co 50 Fe 50 were expected to be 2.0% and 0.5%, respectively, which are small enough to allow an epitaxial relation or to promote a texture between layers. The Co 2 MnSi grown on the Co 90 Fe 10 seed-layer transformed from an A2 to a B2 structure when it was annealed at a temperature as low as 350 °C, evidenced by the (200) peak. The transformation of the Co 2 MnSi to an L2 1 structure did not take place until it was annealed at 500 °C. The soft magnetic properties of the Co 2 MnSi on the Co 90 Fe 10 were substantially improved. In contrast, the Co 2 MnSi prepared on the Co 50 Fe 50 seed-layer did not transform to L2 1 even after annealing at 500 °C. Instead, it showed a B2 structure. The Co 90 Fe 10 and Co 50 Fe 50 ferromagnetic seed-layers found to be useful not only to facilitate the transformation to ordered phases but to improve the soft magnetism of Co 2 MnSi, which makes feasible for the use of Co 2 MnSi in applications such as magnetic read heads, magnetic random access memories, and spin transistors.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics