2025
|
Jana, Dipankar; Acharya, Swagata; Orlita, Milan; Faugeras, Clement; Pashov, Dimitar; Schilfgaarde, Mark Van; Potemski, Marek; Koperski, Maciej Deconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets ADVANCED SCIENCE, 2025, DOI: 10.1002/advs.202505834. Abstract | BibTeX | Endnote @article{WOS:001610214800001,
title = {Deconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets},
author = {Dipankar Jana and Swagata Acharya and Milan Orlita and Clement Faugeras and Dimitar Pashov and Mark Van Schilfgaarde and Marek Potemski and Maciej Koperski},
doi = {10.1002/advs.202505834},
times_cited = {0},
year = {2025},
date = {2025-11-01},
journal = {ADVANCED SCIENCE},
publisher = {WILEY},
address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA},
abstract = {Magneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDipankar Jana
Swagata Acharya
Milan Orlita
Clement Faugeras
Dimitar Pashov
Mark Van Schilfgaarde
Marek Potemski
Maciej Koperski
- TIDeconstruction of the Anisotropic Magnetic Interactions from
Spin-Entangled Optical Excitations in van der Waals Antiferromagnets - SOADVANCED SCIENCE
- DTArticle
- ABMagneto-optical excitations in antiferromagnetic d systems can originate
from a multiplicity of light-spin and spin-spin interactions, as the
light and spin degrees of freedom can be entangled. This is exemplified
in van der Waals systems with attendant strong anisotropy between
in-plane and out-of-plane directions, such as and films studied here.
The rich interplay between the magnetic ordering and sub-bandgap optical
transitions poses a challenge to resolve the mechanisms driving
spin-entangled optical transitions, as well as the single-particle
bandgap itself. Here, a high-fidelity ab initio theory is applied to
find a realistic estimation of the bandgap by elucidating the atom- and
orbital-resolved contributions to the fundamental sub-bands. It is
further demonstrated that the spin-entangled excitations, observable as
photoluminescence and absorption resonances, originate from an on-site
spin-flip transition confined to a magnetic atom (Mn or Ni). The
evolution of the spin-flip transition in a magnetic field is used to
deduce the effective exchange coupling and anisotropy constants. - Z90
- PUWILEY
- PA111 RIVER ST, HOBOKEN 07030-5774, NJ USA
- DI10.1002/advs.202505834
- UTWOS:001610214800001
- ER
- EF
|
Jana, Dipankar; Vaclavkova, Diana; Ulaganathan, Rajesh Kumar; Sankar, Raman; Orlita, Milan; Faugeras, Clement; Koperski, Maciej; Zhitomirsky, M E; Potemski, Marek Strong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3 PHYSICAL REVIEW B, 112 (16), 2025, DOI: 10.1103/8f92-lt57. Abstract | BibTeX | Endnote @article{WOS:001610486500003,
title = {Strong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3},
author = {Dipankar Jana and Diana Vaclavkova and Rajesh Kumar Ulaganathan and Raman Sankar and Milan Orlita and Clement Faugeras and Maciej Koperski and M E Zhitomirsky and Marek Potemski},
doi = {10.1103/8f92-lt57},
times_cited = {1},
issn = {2469-9950},
year = {2025},
date = {2025-10-01},
journal = {PHYSICAL REVIEW B},
volume = {112},
number = {16},
publisher = {AMER PHYSICAL SOC},
address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},
abstract = {The Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2 - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFDipankar Jana
Diana Vaclavkova
Rajesh Kumar Ulaganathan
Raman Sankar
Milan Orlita
Clement Faugeras
Maciej Koperski
M E Zhitomirsky
Marek Potemski
- TIStrong and selective magnon-phonon coupling in the van der Waals
antiferromagnet CoPS3 - SOPHYSICAL REVIEW B
- DTArticle
- ABThe Raman scattering response of the biaxial antiferromagnet CoPS3 has
been investigated as a function of both magnetic field and temperature.
The peaks observed in the low-frequency spectral range (90-200 cm-1)
have been identified as hybrid magnon-phonon excitations. The energies
of the bare magnon and phonon modes and the effective coupling strengths
between different excitation pairs have been determined. The strong and
selective magnon-phonon interaction largely accounts for the pronounced
splitting of two phononlike modes observed at 152 and 158 cm-1 in the
antiferromagnetic phase of CoPS3. Based on the identification of bare
magnon excitations and their magnetic-field dependence, we propose an updated set of parameters for the effective exchange (Jeff = 9.9 meV) and biaxial magnetic anisotropy (D = 4.3 meV and E = -0.7 meV) and advocate for an apparent anisotropic g factor (gx = gy = 2 - Z91
- PUAMER PHYSICAL SOC
- PAONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
- SN2469-9950
- VL112
- DI10.1103/8f92-lt57
- UTWOS:001610486500003
- ER
- EF
|
Fullerton, John; Li, Yue; Solanki, Harshvardhan; Grebenchuk, Sergey; Grzeszczyk, Magdalena; Chen, Zhaolong; Siskins, Makars; Novoselov, Kostya S; Koperski, Maciej; Santos, Elton J G; Phatak, Charudatta Observation of Topological Chirality Switching Induced Freezing of a
Skyrmion Crystal ADVANCED MATERIALS, 2025, DOI: 10.1002/adma.202513067. Abstract | BibTeX | Endnote @article{WOS:001601237600001,
title = {Observation of Topological Chirality Switching Induced Freezing of a
Skyrmion Crystal},
author = {John Fullerton and Yue Li and Harshvardhan Solanki and Sergey Grebenchuk and Magdalena Grzeszczyk and Zhaolong Chen and Makars Siskins and Kostya S Novoselov and Maciej Koperski and Elton J G Santos and Charudatta Phatak},
doi = {10.1002/adma.202513067},
times_cited = {0},
issn = {0935-9648},
year = {2025},
date = {2025-10-01},
journal = {ADVANCED MATERIALS},
publisher = {WILEY-V C H VERLAG GMBH},
address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY},
abstract = {Magnetic skyrmions are topologically protected quasi-particles with a
well-defined chirality. Control over their chirality is proposed as an
additional feature for encoding data bits or as qubits in quantum
computing due to their high efficiency and stability against achiral
magnetic textures. Here it is shown that an in-plane magnetic field can
be utilized to reshape the energy barriers between different skyrmionic
bubbles (e.g., Bloch type, type-II) enabling spontaneous chirality
fluctuations with a frequency that increases with the strength of the
in-plane field. The insulating van der Waals ferromagnet CrBr3 is used
as an archetypal system for low damping, reduced energy dissipation and
a high number of magnetic phases to capture the chirality dynamics in
real time through cryo-Lorentz transmission electron microscopy. It is
observed that the interplay between the intrinsic Dzyaloshinskii-Moriya
interaction and out-of-plane field biased the chirality dynamics,
favoring one handedness over the other. A remarkable consequence of the
spontaneous chirality switching mechanism is that it induces a freezing
(or crystallization) process in the skyrmion lattice. As the bubbles
fluctuate between Bloch and type-II they elongate and shrink parallel to
the in-plane field. Subsequently, the overall lattice crystallizes along
the in-plane field direction, inducing a phase transition from a
disordered liquid state to a hexatic phase where skyrmions are highly
ordered resembling that of a solid. The results indicate chirality as an
active element in the creation of topologically protected skyrmion
crystals unveiling pathways toward chiral spintronic device platforms
with tunable embedded configuration.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magnetic skyrmions are topologically protected quasi-particles with a
well-defined chirality. Control over their chirality is proposed as an
additional feature for encoding data bits or as qubits in quantum
computing due to their high efficiency and stability against achiral
magnetic textures. Here it is shown that an in-plane magnetic field can
be utilized to reshape the energy barriers between different skyrmionic
bubbles (e.g., Bloch type, type-II) enabling spontaneous chirality
fluctuations with a frequency that increases with the strength of the
in-plane field. The insulating van der Waals ferromagnet CrBr3 is used
as an archetypal system for low damping, reduced energy dissipation and
a high number of magnetic phases to capture the chirality dynamics in
real time through cryo-Lorentz transmission electron microscopy. It is
observed that the interplay between the intrinsic Dzyaloshinskii-Moriya
interaction and out-of-plane field biased the chirality dynamics,
favoring one handedness over the other. A remarkable consequence of the
spontaneous chirality switching mechanism is that it induces a freezing
(or crystallization) process in the skyrmion lattice. As the bubbles
fluctuate between Bloch and type-II they elongate and shrink parallel to
the in-plane field. Subsequently, the overall lattice crystallizes along
the in-plane field direction, inducing a phase transition from a
disordered liquid state to a hexatic phase where skyrmions are highly
ordered resembling that of a solid. The results indicate chirality as an
active element in the creation of topologically protected skyrmion
crystals unveiling pathways toward chiral spintronic device platforms
with tunable embedded configuration. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFJohn Fullerton
Yue Li
Harshvardhan Solanki
Sergey Grebenchuk
Magdalena Grzeszczyk
Zhaolong Chen
Makars Siskins
Kostya S Novoselov
Maciej Koperski
Elton J G Santos
Charudatta Phatak
- TIObservation of Topological Chirality Switching Induced Freezing of a
Skyrmion Crystal - SOADVANCED MATERIALS
- DTArticle
- ABMagnetic skyrmions are topologically protected quasi-particles with a
well-defined chirality. Control over their chirality is proposed as an
additional feature for encoding data bits or as qubits in quantum
computing due to their high efficiency and stability against achiral
magnetic textures. Here it is shown that an in-plane magnetic field can
be utilized to reshape the energy barriers between different skyrmionic
bubbles (e.g., Bloch type, type-II) enabling spontaneous chirality
fluctuations with a frequency that increases with the strength of the
in-plane field. The insulating van der Waals ferromagnet CrBr3 is used
as an archetypal system for low damping, reduced energy dissipation and
a high number of magnetic phases to capture the chirality dynamics in
real time through cryo-Lorentz transmission electron microscopy. It is
observed that the interplay between the intrinsic Dzyaloshinskii-Moriya
interaction and out-of-plane field biased the chirality dynamics,
favoring one handedness over the other. A remarkable consequence of the
spontaneous chirality switching mechanism is that it induces a freezing
(or crystallization) process in the skyrmion lattice. As the bubbles
fluctuate between Bloch and type-II they elongate and shrink parallel to
the in-plane field. Subsequently, the overall lattice crystallizes along
the in-plane field direction, inducing a phase transition from a
disordered liquid state to a hexatic phase where skyrmions are highly
ordered resembling that of a solid. The results indicate chirality as an
active element in the creation of topologically protected skyrmion
crystals unveiling pathways toward chiral spintronic device platforms
with tunable embedded configuration. - Z90
- PUWILEY-V C H VERLAG GMBH
- PAPOSTFACH 101161, 69451 WEINHEIM, GERMANY
- SN0935-9648
- DI10.1002/adma.202513067
- UTWOS:001601237600001
- ER
- EF
|
Kipczak, Lucja; Chen, Zhaolong; Grzeszczyk, Magdalena; Grebenchuk, Sergey; Huang, Pengru; Vaklinova, Kristina; Watanabe, Kenji; Taniguchi, Takashi; Babinski, Adam; Koperski, Maciej; Molas, Maciej R Interplay between charge transfer and magnetic proximity effects in
WSe2/CrCl3 heterostructures NANOSCALE HORIZONS, 10 (10), pp. 2465-2474, 2025, DOI: 10.1039/d5nh00198f. Abstract | BibTeX | Endnote @article{WOS:001541286100001,
title = {Interplay between charge transfer and magnetic proximity effects in
WSe2/CrCl3 heterostructures},
author = {Lucja Kipczak and Zhaolong Chen and Magdalena Grzeszczyk and Sergey Grebenchuk and Pengru Huang and Kristina Vaklinova and Kenji Watanabe and Takashi Taniguchi and Adam Babinski and Maciej Koperski and Maciej R Molas},
doi = {10.1039/d5nh00198f},
times_cited = {0},
issn = {2055-6756},
year = {2025},
date = {2025-09-01},
journal = {NANOSCALE HORIZONS},
volume = {10},
number = {10},
pages = {2465-2474},
publisher = {ROYAL SOC CHEMISTRY},
address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND},
abstract = {Ferromagnetism in van der Waals systems with diverse spin arrangements
opened a pathway to use proximity magnetic fields to activate the
properties of materials that would otherwise require external stimuli.
Herein, we demonstrate this concept by creating heterostructures
comprising a bulk CrCl3 antiferromagnet with in-plane easy-axis
magnetization and a monolayer (ML) WSe2 semiconductor. Photoluminescence
and magnetic force microscopy techniques were performed to reveal the
interaction between the relevant layers in the WSe2/CrCl3
heterostructures (HSs). The quenching of the WSe2 emission is apparent
in the WSe2/CrCl3 HSs due to an efficient charge transfer process
enabled by the relative band alignment within the structures. Moreover,
we demonstrate that at specific spatial locations in the structures, the
magnetic proximity effect between the WSe2 ML and the CrCl3 bulk
activates dark exciton emission within the WSe2 ML. The dark exciton
emission in the WSe2 ML survives to a higher temperature than the
intraplane Curie temperature (TC) of the CrCl3 because of its elevated
TC in the strained regions of the CrCl3 layer. Our findings are relevant
to the development of spintronics and valleytronics with long-lived dark
states on technological timescales, as well as to sensing applications
of local magnetic fields realized simultaneously in multiple dimensions.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ferromagnetism in van der Waals systems with diverse spin arrangements
opened a pathway to use proximity magnetic fields to activate the
properties of materials that would otherwise require external stimuli.
Herein, we demonstrate this concept by creating heterostructures
comprising a bulk CrCl3 antiferromagnet with in-plane easy-axis
magnetization and a monolayer (ML) WSe2 semiconductor. Photoluminescence
and magnetic force microscopy techniques were performed to reveal the
interaction between the relevant layers in the WSe2/CrCl3
heterostructures (HSs). The quenching of the WSe2 emission is apparent
in the WSe2/CrCl3 HSs due to an efficient charge transfer process
enabled by the relative band alignment within the structures. Moreover,
we demonstrate that at specific spatial locations in the structures, the
magnetic proximity effect between the WSe2 ML and the CrCl3 bulk
activates dark exciton emission within the WSe2 ML. The dark exciton
emission in the WSe2 ML survives to a higher temperature than the
intraplane Curie temperature (TC) of the CrCl3 because of its elevated
TC in the strained regions of the CrCl3 layer. Our findings are relevant
to the development of spintronics and valleytronics with long-lived dark
states on technological timescales, as well as to sensing applications
of local magnetic fields realized simultaneously in multiple dimensions. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFLucja Kipczak
Zhaolong Chen
Magdalena Grzeszczyk
Sergey Grebenchuk
Pengru Huang
Kristina Vaklinova
Kenji Watanabe
Takashi Taniguchi
Adam Babinski
Maciej Koperski
Maciej R Molas
- TIInterplay between charge transfer and magnetic proximity effects in
WSe2/CrCl3 heterostructures - SONANOSCALE HORIZONS
- DTArticle
- ABFerromagnetism in van der Waals systems with diverse spin arrangements
opened a pathway to use proximity magnetic fields to activate the
properties of materials that would otherwise require external stimuli.
Herein, we demonstrate this concept by creating heterostructures
comprising a bulk CrCl3 antiferromagnet with in-plane easy-axis
magnetization and a monolayer (ML) WSe2 semiconductor. Photoluminescence
and magnetic force microscopy techniques were performed to reveal the
interaction between the relevant layers in the WSe2/CrCl3
heterostructures (HSs). The quenching of the WSe2 emission is apparent
in the WSe2/CrCl3 HSs due to an efficient charge transfer process
enabled by the relative band alignment within the structures. Moreover,
we demonstrate that at specific spatial locations in the structures, the
magnetic proximity effect between the WSe2 ML and the CrCl3 bulk
activates dark exciton emission within the WSe2 ML. The dark exciton
emission in the WSe2 ML survives to a higher temperature than the
intraplane Curie temperature (TC) of the CrCl3 because of its elevated
TC in the strained regions of the CrCl3 layer. Our findings are relevant
to the development of spintronics and valleytronics with long-lived dark
states on technological timescales, as well as to sensing applications
of local magnetic fields realized simultaneously in multiple dimensions. - Z90
- PUROYAL SOC CHEMISTRY
- PATHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND - SN2055-6756
- VL10
- BP2465
- EP2474
- DI10.1039/d5nh00198f
- UTWOS:001541286100001
- ER
- EF
|
Zhang, Hongji; Grebenko, Artem K; Iakoubovskii, Konstantin V; Zhang, Hanning; Yamaletdinov, Ruslan; Makarova, Anna; Fedorov, Alexander; Rejaul, S K; Shivajirao, Ranjith; Tong, Zheng Jue; Grebenchuk, Sergey; Karadeniz, Ugur; Shi, Lu; Vyalikh, Denis V; He, Ya; Starkov, Andrei; Alekseeva, Alena A; Tee, Chuan Chu; Orofeo, Carlo Mendoza; Lin, Junhao; Suenaga, Kazutomo; Bosman, Michel; Koperski, Maciej; Weber, Bent; Novoselov, Kostya S; Yazyev, Oleg V; Toh, Chee-Tat; Ozyilmaz, Barbaros Superior Adhesion of Monolayer Amorphous Carbon to Copper ADVANCED MATERIALS, 37 (32), 2025, DOI: 10.1002/adma.202419112. Abstract | BibTeX | Endnote @article{WOS:001498039100001,
title = {Superior Adhesion of Monolayer Amorphous Carbon to Copper},
author = {Hongji Zhang and Artem K Grebenko and Konstantin V Iakoubovskii and Hanning Zhang and Ruslan Yamaletdinov and Anna Makarova and Alexander Fedorov and S K Rejaul and Ranjith Shivajirao and Zheng Jue Tong and Sergey Grebenchuk and Ugur Karadeniz and Lu Shi and Denis V Vyalikh and Ya He and Andrei Starkov and Alena A Alekseeva and Chuan Chu Tee and Carlo Mendoza Orofeo and Junhao Lin and Kazutomo Suenaga and Michel Bosman and Maciej Koperski and Bent Weber and Kostya S Novoselov and Oleg V Yazyev and Chee-Tat Toh and Barbaros Ozyilmaz},
doi = {10.1002/adma.202419112},
times_cited = {1},
issn = {0935-9648},
year = {2025},
date = {2025-08-01},
journal = {ADVANCED MATERIALS},
volume = {37},
number = {32},
publisher = {WILEY-V C H VERLAG GMBH},
address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY},
abstract = {The single-atom thickness of graphene holds great potential for device
scaling, but its effectiveness as a thin metal-ion diffusion barrier in
microelectronics and a corrosion barrier for plasmonic devices is
compromised by weak van der Waals interactions with copper (Cu), leading
to delamination issues. In contrast, monolayer amorphous carbon (MAC), a
recently reported single-atom-thick carbon film with a disordered sp2
hybridized structure, demonstrates superior adhesion properties. This
study reveals that MAC exhibits an adhesion energy of 85 J m-2 on Cu,
which is 13 times greater than that of graphene. This exceptional
adhesion is attributed to the formation of covalent-like Cu & horbar;C
bonds while preserving its sp2 structure, as evidenced by X-ray
photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine
structure (NEXAFS) spectroscopy. Density functional theory (DFT)
calculations further elucidate that the corrugated structure of MAC
facilitates the hybridization of C 2pz orbitals with Cu 4s and 3dz2
orbitals, promoting strong bonding. These insights indicate that the
amorphous structure of MAC significantly enhances adhesion while
preserving its elemental composition, providing a pathway to improve the
mechanical reliability and performance of two-dimensional (2D) materials
on metal substrates in various technological applications.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The single-atom thickness of graphene holds great potential for device
scaling, but its effectiveness as a thin metal-ion diffusion barrier in
microelectronics and a corrosion barrier for plasmonic devices is
compromised by weak van der Waals interactions with copper (Cu), leading
to delamination issues. In contrast, monolayer amorphous carbon (MAC), a
recently reported single-atom-thick carbon film with a disordered sp2
hybridized structure, demonstrates superior adhesion properties. This
study reveals that MAC exhibits an adhesion energy of 85 J m-2 on Cu,
which is 13 times greater than that of graphene. This exceptional
adhesion is attributed to the formation of covalent-like Cu & horbar;C
bonds while preserving its sp2 structure, as evidenced by X-ray
photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine
structure (NEXAFS) spectroscopy. Density functional theory (DFT)
calculations further elucidate that the corrugated structure of MAC
facilitates the hybridization of C 2pz orbitals with Cu 4s and 3dz2
orbitals, promoting strong bonding. These insights indicate that the
amorphous structure of MAC significantly enhances adhesion while
preserving its elemental composition, providing a pathway to improve the
mechanical reliability and performance of two-dimensional (2D) materials
on metal substrates in various technological applications. - FNClarivate Analytics Web of Science
- VR1.0
- PTJ
- AFHongji Zhang
Artem K Grebenko
Konstantin V Iakoubovskii
Hanning Zhang
Ruslan Yamaletdinov
Anna Makarova
Alexander Fedorov
S K Rejaul
Ranjith Shivajirao
Zheng Jue Tong
Sergey Grebenchuk
Ugur Karadeniz
Lu Shi
Denis V Vyalikh
Ya He
Andrei Starkov
Alena A Alekseeva
Chuan Chu Tee
Carlo Mendoza Orofeo
Junhao Lin
Kazutomo Suenaga
Michel Bosman
Maciej Koperski
Bent Weber
Kostya S Novoselov
Oleg V Yazyev
Chee-Tat Toh
Barbaros Ozyilmaz
- TISuperior Adhesion of Monolayer Amorphous Carbon to Copper
- SOADVANCED MATERIALS
- DTArticle
- ABThe single-atom thickness of graphene holds great potential for device
scaling, but its effectiveness as a thin metal-ion diffusion barrier in
microelectronics and a corrosion barrier for plasmonic devices is
compromised by weak van der Waals interactions with copper (Cu), leading
to delamination issues. In contrast, monolayer amorphous carbon (MAC), a
recently reported single-atom-thick carbon film with a disordered sp2
hybridized structure, demonstrates superior adhesion properties. This
study reveals that MAC exhibits an adhesion energy of 85 J m-2 on Cu,
which is 13 times greater than that of graphene. This exceptional
adhesion is attributed to the formation of covalent-like Cu & horbar;C
bonds while preserving its sp2 structure, as evidenced by X-ray
photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine
structure (NEXAFS) spectroscopy. Density functional theory (DFT)
calculations further elucidate that the corrugated structure of MAC
facilitates the hybridization of C 2pz orbitals with Cu 4s and 3dz2
orbitals, promoting strong bonding. These insights indicate that the
amorphous structure of MAC significantly enhances adhesion while
preserving its elemental composition, providing a pathway to improve the
mechanical reliability and performance of two-dimensional (2D) materials
on metal substrates in various technological applications. - Z91
- PUWILEY-V C H VERLAG GMBH
- PAPOSTFACH 101161, 69451 WEINHEIM, GERMANY
- SN0935-9648
- VL37
- DI10.1002/adma.202419112
- UTWOS:001498039100001
- ER
- EF
|
