Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene

Alessandro Barla; Valerio Bellini; Stefano Rusponi; Paolo Ferriani; Marina Pivetta; Fabio Donati; François Patthey; Luca Persichetti; Sanjoy K. Mahatha; Marco Papagno; Cinthia Piamonteze; Simon Fichtner; Stefan Heinze; Pietro Gambardella; Harald Brune; Carlo Carbone

doi:10.1021/acsnano.5b06410

Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene

Alessandro Barla, Valerio Bellini, Stefano Rusponi, Paolo Ferriani, Marina Pivetta, Fabio Donati, François Patthey, Luca Persichetti, Sanjoy K. Mahatha, Marco Papagno, Cinthia Piamonteze, Simon Fichtner, Stefan Heinze, Pietro Gambardella, Harald Brune, Carlo Carbone

Department of Physics

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

27 Scopus citations

Abstract

We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.

Original language	English
Pages (from-to)	1101-1107
Number of pages	7
Journal	ACS Nano
Volume	10
Issue number	1
DOIs	https://doi.org/10.1021/acsnano.5b06410
State	Published - 26 Jan 2016

Bibliographical note

Publisher Copyright:
© 2015 American Chemical Society.

Keywords

Density functional theory (DFT)
Graphene
Magnetic exchange interaction
Scanning tunneling microscopy (STM)
X-ray magnetic circular dichroism (XMCD)

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10.1021/acsnano.5b06410

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Barla, A., Bellini, V., Rusponi, S., Ferriani, P., Pivetta, M., Donati, F., Patthey, F., Persichetti, L., Mahatha, S. K., Papagno, M., Piamonteze, C., Fichtner, S., Heinze, S., Gambardella, P., Brune, H., & Carbone, C. (2016). Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene. ACS Nano, 10(1), 1101-1107. https://doi.org/10.1021/acsnano.5b06410

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title = "Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene",

abstract = "We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.",

keywords = "Density functional theory (DFT), Graphene, Magnetic exchange interaction, Scanning tunneling microscopy (STM), X-ray magnetic circular dichroism (XMCD)",

author = "Alessandro Barla and Valerio Bellini and Stefano Rusponi and Paolo Ferriani and Marina Pivetta and Fabio Donati and Fran{\c c}ois Patthey and Luca Persichetti and Mahatha, {Sanjoy K.} and Marco Papagno and Cinthia Piamonteze and Simon Fichtner and Stefan Heinze and Pietro Gambardella and Harald Brune and Carlo Carbone",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2016",

month = jan,

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doi = "10.1021/acsnano.5b06410",

language = "English",

volume = "10",

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Barla, A, Bellini, V, Rusponi, S, Ferriani, P, Pivetta, M, Donati, F, Patthey, F, Persichetti, L, Mahatha, SK, Papagno, M, Piamonteze, C, Fichtner, S, Heinze, S, Gambardella, P, Brune, H & Carbone, C 2016, 'Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene', ACS Nano, vol. 10, no. 1, pp. 1101-1107. https://doi.org/10.1021/acsnano.5b06410

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T1 - Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene

AU - Barla, Alessandro

AU - Bellini, Valerio

AU - Rusponi, Stefano

AU - Ferriani, Paolo

AU - Pivetta, Marina

AU - Donati, Fabio

AU - Patthey, François

AU - Persichetti, Luca

AU - Mahatha, Sanjoy K.

AU - Papagno, Marco

AU - Piamonteze, Cinthia

AU - Fichtner, Simon

AU - Heinze, Stefan

AU - Gambardella, Pietro

AU - Brune, Harald

AU - Carbone, Carlo

PY - 2016/1/26

Y1 - 2016/1/26

N2 - We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.

AB - We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.

KW - Density functional theory (DFT)

KW - Graphene

KW - Magnetic exchange interaction

KW - Scanning tunneling microscopy (STM)

KW - X-ray magnetic circular dichroism (XMCD)

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DO - 10.1021/acsnano.5b06410

M3 - Article

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VL - 10

SP - 1101

EP - 1107

JO - ACS Nano

JF - ACS Nano

IS - 1

ER -

Complex magnetic exchange coupling between co nanostructures and Ni(111) across epitaxial graphene

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Keywords

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