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RESEARCH PRODUCT
Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3−EuS Heterostructures
Jairo SinovaJairo SinovaKyoung-whan KimRuqian WuJeongwoo KimHui Wangsubject
PhysicsCondensed matter physicsMagnetic momentExchange interactionGeneral Physics and AstronomyHeterojunction02 engineering and technologySpin–orbit interaction021001 nanoscience & nanotechnology01 natural sciencesFerromagnetismTopological insulator0103 physical sciencesCurie temperature010306 general physics0210 nano-technologySurface statesdescription
A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis et al., Nature (London) 533, 513 (2016).]. Through systematic density functional calculations, we demonstrate that in addition to the factor that ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ has a strong spin orbit coupling, the topological surface states are crucial to make these unusual behaviors robust as they hybridize with EuS states and extend rather far into the magnetic layers. The magnetic moments of Eu atoms are nevertheless not much enhanced, unlike what was reported in the experiment. Our results and model analyses provide useful insights for how these quantities are linked, and pave a way for the control of properties of magnetic films via contact with topological insulators.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-07-13 | Physical Review Letters |