Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons

Kewei Sun; Orlando J. Silveira; Shohei Saito; Keisuke Sagisaka; Shigehiro Yamaguchi; Adam S. Foster; Shigeki Kawai

doi:10.1021/acsnano.2c04563

Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons

Kewei Sun, Orlando J. Silveira, Shohei Saito, Keisuke Sagisaka, Shigehiro Yamaguchi, Adam S. Foster, Shigeki Kawai^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

1 Citation (Scopus)

Abstract

The design of magnetic topological states due to spin polarization in an extended πcarbon system has great potential in spintronics application. Although magnetic zigzag edges in graphene nanoribbons (GNRs) have been investigated earlier, real-space observation and manipulation of spin polarization in a heteroatom substituted system remains challenging. Here, we investigate a zero-bias peak at a boron site embedded at the center of an armchair-type GNR on a AuSiX/Au(111) surface with a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. After the tip-induced removal of a Si atom connected to two adjacent boron atoms, a clear Kondo resonance peak appeared and was further split by an applied magnetic field of 12 T. This magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms.

Original language	English
Pages (from-to)	11244–11250
Number of pages	7
Journal	ACS Nano
Volume	16
Issue number	7
Early online date	22 Jun 2022
DOIs	https://doi.org/10.1021/acsnano.2c04563
Publication status	Published - 26 Jul 2022
MoE publication type	A1 Journal article-refereed

Keywords

AuSilayer
boron substituted graphene nanoribbons
Kondo resonance
scanning tunneling microscopy/spectroscopy
silicon atoms
spin polarization

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title = "Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons",

abstract = "The design of magnetic topological states due to spin polarization in an extended πcarbon system has great potential in spintronics application. Although magnetic zigzag edges in graphene nanoribbons (GNRs) have been investigated earlier, real-space observation and manipulation of spin polarization in a heteroatom substituted system remains challenging. Here, we investigate a zero-bias peak at a boron site embedded at the center of an armchair-type GNR on a AuSiX/Au(111) surface with a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. After the tip-induced removal of a Si atom connected to two adjacent boron atoms, a clear Kondo resonance peak appeared and was further split by an applied magnetic field of 12 T. This magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms. ",

keywords = "AuSilayer, boron substituted graphene nanoribbons, Kondo resonance, scanning tunneling microscopy/spectroscopy, silicon atoms, spin polarization",

author = "Kewei Sun and Silveira, {Orlando J.} and Shohei Saito and Keisuke Sagisaka and Shigehiro Yamaguchi and Foster, {Adam S.} and Shigeki Kawai",

note = "Funding Information: This work was supported in part by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Nos. 21F21058, 21K18885, and 22H00285. Computing resources from the Aalto Science-IT project and CSC, Helsinki are gratefully acknowledged. A.S.F. was supported by the World Premier International Research Center Initiative (WPI), MEXT, Japan. K.Sun thanks S. Yoshizawa for his technical support in the STM measurement in the magnetic field. Publisher Copyright: {\textcopyright} 2022 American Chemical Society.",

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AU - Sun, Kewei

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AU - Yamaguchi, Shigehiro

AU - Foster, Adam S.

AU - Kawai, Shigeki

N1 - Funding Information: This work was supported in part by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Nos. 21F21058, 21K18885, and 22H00285. Computing resources from the Aalto Science-IT project and CSC, Helsinki are gratefully acknowledged. A.S.F. was supported by the World Premier International Research Center Initiative (WPI), MEXT, Japan. K.Sun thanks S. Yoshizawa for his technical support in the STM measurement in the magnetic field. Publisher Copyright: © 2022 American Chemical Society.

PY - 2022/7/26

Y1 - 2022/7/26

N2 - The design of magnetic topological states due to spin polarization in an extended πcarbon system has great potential in spintronics application. Although magnetic zigzag edges in graphene nanoribbons (GNRs) have been investigated earlier, real-space observation and manipulation of spin polarization in a heteroatom substituted system remains challenging. Here, we investigate a zero-bias peak at a boron site embedded at the center of an armchair-type GNR on a AuSiX/Au(111) surface with a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. After the tip-induced removal of a Si atom connected to two adjacent boron atoms, a clear Kondo resonance peak appeared and was further split by an applied magnetic field of 12 T. This magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms.

AB - The design of magnetic topological states due to spin polarization in an extended πcarbon system has great potential in spintronics application. Although magnetic zigzag edges in graphene nanoribbons (GNRs) have been investigated earlier, real-space observation and manipulation of spin polarization in a heteroatom substituted system remains challenging. Here, we investigate a zero-bias peak at a boron site embedded at the center of an armchair-type GNR on a AuSiX/Au(111) surface with a combination of low-temperature scanning tunneling microscopy/spectroscopy and density functional theory calculations. After the tip-induced removal of a Si atom connected to two adjacent boron atoms, a clear Kondo resonance peak appeared and was further split by an applied magnetic field of 12 T. This magnetic state can be relayed along the longitudinal axis of the GNR by sequential removal of Si atoms.

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Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons

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Manipulation of Spin Polarization in Boron-Substituted Graphene Nanoribbons

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