Heterostructured ferromagnet-topological insulator with dual-phase magnetic properties.

ABSTRACT: The introduction of ferromagnetism at the surface of a topological insulator (TI) produces fascinating spin-charge phenomena. It has been assumed that these fascinating effects are associated with a homogeneous ferromagnetic (FM) layer possessing a single type of magnetic phase. However, we obtained phase separation within the FM layer of a Ni₈₀Fe₂₀/Bi₂Se₃ heterostructure. This phase separation was caused by the diffusion of Ni into Bi₂Se₃, forming a ternary magnetic phase of Ni:Bi₂Se₃. The inward diffusion of Ni led to the formation of an FeSe phase outward, transforming the original Ni₈₀Fe₂₀/Bi₂Se₃ into a sandwich structure comprising FeSe/Ni:Bi₂S

SUBMITTER: Chang SJ 

PROVIDER: S-EPMC9078499 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature