We investigated the structural and magnetic properties of Co 2MnSi deposited on Co 90Fe 10 and Co 50Fe 50 ferromagnetic seed-layers at room temperature before and after annealing at various temperatures up to 500 °C. The lattice misfits between Co 2MnSi and Co 90Fe 10 and between Co 2MnSi and Co 50Fe 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 2MnSi grown on the Co 90Fe 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 2MnSi to an L2 1 structure did not take place until it was annealed at 500 °C. The soft magnetic properties of the Co 2MnSi on the Co 90Fe 10 were substantially improved. In contrast, the Co 2MnSi prepared on the Co 50Fe 50 seed-layer did not transform to L2 1 even after annealing at 500 °C. Instead, it showed a B2 structure. The Co 90Fe 10 and Co 50Fe 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 2MnSi, which makes feasible for the use of Co 2MnSi in applications such as magnetic read heads, magnetic random access memories, and spin transistors.
Bibliographical noteFunding Information:
This research was supported in part by Basic Science Research Program (2011-0003263 and 2012-009406) and Pioneer Research Center Program (2011-000-2116) funded by the Ministry of Education, Science and Technology in Korea .
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics