Detailed low-energy electron diffraction analysis of the (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>4</mml:mn><mml:mo>×</mml:mo><mml:mn>4</mml:mn></mml:mrow></mml:math>) surface structure of C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>60</mml:mn></mml:msub></mml:math>on Cu(111): Seven-atom-vacancy reconstruction

Xu, Geng; Shi, Xingqiang; Zhang, R. Q.; Pai, Woei Wu; Jeng, Horng‐Tay; Hove, M. A. Van

doi:10.1103/physrevb.86.075419

Cited by 29 publications

(26 citation statements)

References 18 publications

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“…This result set a trend of experiments on similar systems where a single-or a multi-atom vacancy has been observed. Indeed, the presence of vacancies in C 60 / metal systems have also been reported on many metals such as Au(111), Au(110), Ag(111), Cu(111), Al(111) and Pt(110) [11,13,15,20,21,24,28,[36][37][38][39]. Thus, single-atom vacancy formation has been suggested to be 'the rule rather than the exception' [36].…”

Section: Introductionmentioning

confidence: 99%

“…There is an extended bibliography on thin films of C 60 on many different single crystal metal substrates as Pt [4][5][6][7][8][9][10], Al [11,12], Cu [13][14][15][16][17][18], Au [19][20][21][22][23][24][25][26][27][28] and Ag [29][30][31][32][33][34] or even on graphene [35], among many others. On some metals, when deposited at room temperature (RT), C 60 interacts with both the metallic surface and the surrounding molecules by van der Waals (vdW) interactions.…”

Section: Introductionmentioning

confidence: 99%

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Vacancy formation on C60/Pt (111): unraveling the complex atomistic mechanism

et al. 2014

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Pinardi, A.L.; Biddau, G.; van de Ruit, K.; Otero-Irurueta, G.; Gardonio, S.; Lizzit, S.; Schennach, R.; Flipse, C.F.J.; Lopez, M.F.; Méndez, J.; Perez, R.; Martin-Gago, J.A. Published in: Nanotechnology DOI:10.1088/0957-4484/25/38/385602Published: 01/01/2014 Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Pinardi, A. L., Biddau, G., Ruit, van de, K., Otero-Irurueta, G., Gardonio, S., Lizzit, S., ... Martin-Gago, J. A. (2014). Vacancy formation on C60/Pt (111): unraveling the complex atomistic mechanism. Nanotechnology, 25, 385602-1/13. DOI: 10.1088/0957-4484/25/38/385602 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractThe interaction of fullerenes with transition metal surfaces leads to the development of an atomic network of ordered vacancies on the metal. However, the structure and formation mechanism of this intricate surface reconstruction is not yet understood at an atomic level. We combine scanning tunneling microscopy, high resolution and temperature programmed-x-ray photoelectrons spectroscopy, and density functional theory calculations to show that the vacancy formation in C60/Pt(111) is a complex process in which fullerenes undergo two significant structural rearrangements upon thermal annealing. At first, the molecules are physisorbed on the surface; next, they chemisorb inducing the formation of an adatom-vacancy pair on the side of the fullerene. Finally, this metastable state relaxes when the adatom migrates away and the vacancy moves under the molecule. The evolution from a weakly-bound fullerene to a chemisorb...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vacancy formation on C60/Pt (111): unraveling the complex atomistic mechanism

et al. 2014

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“…The potential created by the mismatch of molecular and metal work functions leads to a partial filling of the interface states. [19][20][21] Other molecules with close electron affinity and the potential for 3d z /p coupling could be used to similar effect. In the case of C 60 on metallic substrates such as Cu films, the charge transfer from the metal can be of up to 3e -per molecule and leads to a metallisation of the interface.…”

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“…The molecular roughness of the C 60 films has been accounted for via several interface models based on: i. the single crystal 7-vacancy Cu(111) reconstruction, 20 ii. C 60 encapsulation into adsorbed Cu (111) Atom-resolved analysis of the I s parameter reveals up to a factor 4 change of the exchange strength at the Cu-C 60 interfaces (Fig.…”

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Beating the Stoner criterion using molecular interfaces

Ma’Mari

Moorsom

Teobaldi

et al. 2015

Nature

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It is accepted that only three elements are ferromagnetic at room temperature, the transition metals iron, cobalt and nickel. The Stoner criterion explains why, for example, iron is ferromagnetic but manganese is not, even though both elements have an unfilled 3d shell and are adjacent in the periodic table: the product of the density of states with the exchange integral must be greater than unity for spontaneous ordering to emerge.1,2 Here, we demonstrate that it is possible to alter the electronic states of nonferromagnetic materials, such as diamagnetic copper and paramagnetic manganese, in 2 order to drive them ferromagnetic at room temperature. This remarkable effect is achieved via interfaces between metallic thin films and C 60 molecular layers. The emergent ferromagnetic state can exist over several layers of the metal before being quenched at large sample thicknesses by the material's bulk properties. While the induced magnetisation is easily measurable by magnetometry, low energy muon spin spectroscopy 3 provides insight into its magnetic distribution by studying the depolarisation process of low energy muons implanted in the sample. This technique indicates localized spin-ordered states at and close to the metallo-molecular interface.Density functional theory simulations suggest a mechanism based on magnetic hardening of the metal atoms due to electron transfer. 4,5 This opens a path for the exploitation of molecular coupling to design magnetic metamaterials using abundant, non-toxic elements such as organic semiconductors. Charge transfer at molecular interfaces can then be used to control spin polarisation or magnetisation, with far reaching consequences in the design of devices for electronic, power or computing applications. 6,7 Multifunctional materials with the spin degree of freedom such as multiferroics, magnetic semiconductors and molecular magnets have all aroused huge interest as potentially transformative components in quantum technologies. [8][9][10][11][12] Strategies used to bring magnetic ordering to these materials typically rely on the inclusion of magnetic transition metals, heavy elements with a large atomic moment or rare earths. In thin film structures, proximity effects and coupling at interfaces play an essential role. 13,14 This is especially the case for molecular spintronics, 15,16 where organic thin films grown on copper have demonstrated spin filtering. 17The organic magnetic coupling can propagate for long distances in systems such as nanoscale vortex-like configurations or nanoskyrmion lattices. 183We choose C 60 as a model molecule due to its structural simplicity and robustness as well as its high electron affinity. C 60 /transition metal complexes exhibit strong interfacial coupling between metal 3d z electrons and molecular π-bonded p electrons. The potential created by the mismatch of molecular and metal work functions leads to a partial filling of the interface states. [19][20][21] Other molecules with close electron affinity and the potential for 3d z /p coupling ...

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“…C 60 can eject different number of substrate atoms and generate vacancies of different sizes, i.e., a single vacancy on Al, 17,18 Pt, 19,20 Ag, 21,22 and Au [23][24][25] (111) surfaces while a seven-atom nanopit on Cu(111) 26,27 . Here using density functional theory 28,29 are linear combinations generated from these two phases for 1.20ML < θ < 1.33ML, as θ is increased gradually.…”

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confidence: 99%