Single-Atomic-Layer Stanene on Ferromagnetic Co Nanoislands with Topological Band Structures

Chia Ju Chen, Yung Chun Chao, Yen Hui Lin, Yi Hao Zhuang, Yen Ming Lai, Shih Tang Huang, Allan H. MacDonald, Chih Kang Shih, Bo Yao Wang*, Jung Jung Su*, Pin Jui Hsu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Introducing magnetism to two-dimensional topological insulators is a central issue in the pursuit of magnetic topological materials in low dimensionality. By means of low-temperature growth at 80 K, we succeeded in fabricating a monolayer stanene on Co/Cu(111) and resolving ferromagnetic spin contrast by field-dependent spin-polarized scanning tunneling microscopy (SP-STM). Increases of both remanence to saturation magnetization ratio (Mr/Ms) and coercive field (Hc) due to an enhanced perpendicular magnetic anisotropy (PMA) are further identified by out-of-plane magneto-optical Kerr effect (MOKE). In addition to ultraflat stanene fully relaxed on bilayer Co/Cu(111) from density functional theory (DFT), characteristic topological properties including an in-plane s-p band inversion and a spin-orbit coupling (SOC) induced gap about 0.25 eV at the Γ̅ point have also been verified in the Sn-projected band structure. Interfacial coupling of single-atomic-layer stanene with ferromagnetic Co biatomic layers allows topological band features to coexist with ferromagnetism, facilitating a conceptual design of atomically thin magnetic topological heterostructures.

Original languageEnglish
Pages (from-to)7456-7465
Number of pages10
JournalACS Nano
Issue number8
StatePublished - 25 Apr 2023


  • density functional theory
  • ferromagnetic Co nanoislands
  • magneto-optical Kerr effect
  • perpendicular magnetic anisotropy
  • single-atomic-layer stanene
  • spin-polarized scanning tunneling microscopy/spectroscopy
  • spin−orbit interaction


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