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

doi:10.1021/acsnano.2c12144

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 journal › Article › peer-review

1 Scopus citations

Abstract

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 (M_r/M_s) and coercive field (H_c) 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 language	English
Pages (from-to)	7456-7465
Number of pages	10
Journal	ACS Nano
Volume	17
Issue number	8
DOIs	https://doi.org/10.1021/acsnano.2c12144
State	Published - 25 Apr 2023

Keywords

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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10.1021/acsnano.2c12144

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title = "Single-Atomic-Layer Stanene on Ferromagnetic Co Nanoislands with Topological Band Structures",

abstract = "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.",

keywords = "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",

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

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AU - Chen, Chia Ju

AU - Chao, Yung Chun

AU - Lin, Yen Hui

AU - Zhuang, Yi Hao

AU - Lai, Yen Ming

AU - Huang, Shih Tang

AU - MacDonald, Allan H.

AU - Shih, Chih Kang

AU - Wang, Bo Yao

AU - Su, Jung Jung

AU - Hsu, Pin Jui

PY - 2023/4/25

Y1 - 2023/4/25

N2 - 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.

AB - 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.

KW - density functional theory

KW - ferromagnetic Co nanoislands

KW - magneto-optical Kerr effect

KW - perpendicular magnetic anisotropy

KW - single-atomic-layer stanene

KW - spin-polarized scanning tunneling microscopy/spectroscopy

KW - spin−orbit interaction

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

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