Spontaneous formation of Mn nanocluster arrays on a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Si</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mn>111</mml:mn></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mtext>−</mml:mtext><mml:mn>7</mml:mn><mml:mo>×</mml:mo><mml:mn>7</mml:mn></mml:mrow></mml:math>surface observed with STM

Wang, Junzhong; Jia, Jin‐Feng; Xiong, Zuhong; Xue, Qi‐Kun

doi:10.1103/physrevb.78.045424

Cited by 18 publications

(15 citation statements)

References 29 publications

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“…Experiments revealed that Mn atoms prefer occupying the FHUCs to UFHUCs. [18][19][20] Therefore, we hereafter focus only on the adsorption of Mn atoms on the FHUCs. 26 We have performed large-scale calculations to search for the diffusion pathways of a single Mn atom on the Si(111)-(7 × 7) surface and map out the potential-energy surface (PES) using a 14 × 14 grid mesh.…”

Section: Resultsmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12][13][14][15] Using the half unit cells (HUCs) as preferential nucleation centers, the ordered Mn nanocluster arrays on the Si(111)-(7 × 7) surface have been successfully fabricated at room and elevated temperatures. [16][17][18][19][20] Scanning tunneling microscopy (STM) studies revealed that Mn nanoclusters prefer occupying the faulted HUCs (FHUCs) to unfaulted HUCs (UFHUCs), and it was observed that a planar two-dimensional (2D) Mn cluster first develops at the initial deposition stages that is followed by the formation of two types of three-dimensional (3D) Mn nanoclusters that coexist on the surface with increasing Mn coverage. 19 The formation mechanism of Mn nanocluster arrays is attributed to the delicate balance between thermodynamic tendency and kinetic limitation.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19][20] Scanning tunneling microscopy (STM) studies revealed that Mn nanoclusters prefer occupying the faulted HUCs (FHUCs) to unfaulted HUCs (UFHUCs), and it was observed that a planar two-dimensional (2D) Mn cluster first develops at the initial deposition stages that is followed by the formation of two types of three-dimensional (3D) Mn nanoclusters that coexist on the surface with increasing Mn coverage. 19 The formation mechanism of Mn nanocluster arrays is attributed to the delicate balance between thermodynamic tendency and kinetic limitation. 20 The Mn clusters on Si(111) provide a unique opportunity for investigating the low dimensional magnetism of metallic nanoclusters due to the less reactive and anomalous magnetic properties of Mn compared with other magnetic metals, such as Fe 21 and Co. 22 However, the diffusion and nucleation process of Mn atoms on the Si(111)-(7 × 7) surface has never been examined by first-principles studies because of the enormous computational cost required.…”

Section: Introductionmentioning

confidence: 99%

“…The present work establishes the energetic landscape for Mn nanoclusters on Si(111), and the resulting structural model provides a natural explanation for recent experimental observations. [16][17][18][19][20] The fundamental understanding of the mechanism for Mn diffusion and nucleation paves the way for precisely controlled growth of Mn cluster arrays on Si(111) with selective size and magnetic moment as well as good uniformity.…”

Section: Introductionmentioning

confidence: 99%

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Size-selective self-assembly of magnetic Mn nanoclusters on Si(111)

Niu

Wang

et al. 2013

The Journal of Chemical Physics

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We show by first-principles calculations two types of magnetic magic Mn clusters on the Si(111)-(7 × 7) surface. The first is a small triangular Mn7 cluster stabilized by the solid-centered Mn-Si3 bonds on the top layer, and the second is a large hexagonal Mn13 cluster favored by the confining potential wells of the faulted half unit cells on the Si(111) surface. These two structural models are distinct from that of the planar group-III clusters on Si(111) and produce simulated scanning tunneling microscopy images in reasonable agreement with recent experimental observations. These results offer key insights for understanding the complex energetic landscape on the Si(111)-(7 × 7) surface, which is critical to precisely controlled growth of Mn nanocluster arrays with specific size, magnetic moment, and good uniformity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Size-selective self-assembly of magnetic Mn nanoclusters on Si(111)

Niu

Wang

et al. 2013

The Journal of Chemical Physics

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“…5 h) and p). This appearance was also observed on many systems such as Au, Zn, and Mn clusters on Si(111)-(7 × 7) [24,28,29].…”

Section: Voltage Dependent Stm Imagesmentioning

confidence: 75%

Scanning tunneling microscopy at multiple voltage biases of stable “ring-like” Ag clusters on Si(111)–(7×7)

et al. 2012

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Since more than twenty years it is known that deposition of Ag onto Si(111)-(7 × 7) leads under certain conditions to the formation of so-called "ring-like" clusters, that are particularly stable among small clusters. In order to resolve their still unknown atomic structure, we performed voltage dependent scanning tunneling microscopy (STM) measurements providing interesting information about the electronic properties of clusters which are linked with their atomic structure. Based on a structural model of Au cluster on Si(111)-(7 × 7) and our STM images, we propose an atomic arrangement for the two most stable Ag "ring-like" clusters.

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Thirty years of solid state physics research at the Institute of Physics, Chinese Academy of Sciences

Wang

2010

Physica Status Solidi (a)

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Keywords: high-pressure structures, phase stability, crystal structure and properties Under compression, simple s-bonded alkali metals pass through the sequence of phases characterized by lowering in symmetry, coordination number and packing density [1]. Structural transformations in these metals are controlled by the combined effects of electrostatic (Madelung) and electronic (band-structure) contributions to the crystal energy. The latter term increases with pressure yielding low-symmetry complex structures, such as Li-cI16, Rb-oC52 and Cs-oC84. Stability of these structures can be supported by a Hume-Rothery argument when new diffraction plains appear close to the Fermi level [2]. Upon compression up to ~0.4 of initial volume, Cs and Rb form a very open structure tI4 with coordination number 4+4 and packing density ~0.56. The transition to Cs-tI4 is accompanied by an approximately 12% reduction in the atomic radius compared with Cs-fcc. Considering the Brillouin zone configuration with respect to the Fermi sphere one can conclude that the Hume-Rothery mechanism is effective if the number of valence electrons increases up to ~4 [2]. In the tI4 structure the loss in the electrostatic energy compared with fcc should be compensated for by the gain in electronic energy that can occur by increase in the number of valence electrons due to the core overlap. The tI4 and oC16 structures in heavy alkalis Rb and Cs are similar to those in polyvalent group IV elements (Si, Ge and Sn) implying the similarity in the valence electron configurations in these two groups metals and supporting an assumption of core ionization in alkalis at much lower pressures than predicted by theory [3]. [1] McMahon M.I., Nelmes R. Keywords: high pressure, nanocrystalline, gold and silver We studied commercially available gold (30 nm, n-Au) and silver (10 nm, nAg) nanoparticles at high pressures up to 30 GPa using X-ray diffraction (XRD) and a diamond-anvil cell. Unexpectedly for that particle size, the nanoparticles show significantly higher bulk modulus than the corresponding bulk materials, i.e. about 60 % for n-Au and 20 % for nAg. The bulk modulus of n-Au, K 0 = 277(5) GPa, even surpasses that of ceramic materials such as B 4 C (254 GPa), SiC (203 GPa), Al 2 O 3 (257 GPa) or TiB 2 (240 GPa). The structural characterization of both kinds of nanoparticles by XRD using a whole pattern-fitting method [1] and high-resolution electron microscopy (HRTEM) identified polysynthetic domain twinning and lamellar defects as described in [2] as the main origin of the strong decrease in compressibility. Free-surface effects do not play a significant role.

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Spontaneous formation of Mn nanocluster arrays on aSi(111)−7×7surface observed with STM

Cited by 18 publications

References 29 publications

Size-selective self-assembly of magnetic Mn nanoclusters on Si(111)

Size-selective self-assembly of magnetic Mn nanoclusters on Si(111)

Scanning tunneling microscopy at multiple voltage biases of stable “ring-like” Ag clusters on Si(111)–(7×7)

Thirty years of solid state physics research at the Institute of Physics, Chinese Academy of Sciences

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