Self-organized growth and magnetic properties of epitaxial silicide nanoislands

Tripathi, J.; Levy, R.; Camus, Y.; Dascalu, Matan; Cesura, Federico; Chalasani, Rajesh; Köhn, A.; Markovich, Gil; Goldfarb, I.

doi:10.1016/j.apsusc.2016.02.168

Cited by 16 publications

(8 citation statements)

References 73 publications

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“…In densely packed arrays, interparticle interaction via dipolar fields may take place, leading to superspin glass (SSG) or superferromagnetic (SFM) state, [ 13 , 14 , 15 ]. These three phenomena of “Supermagnetism” (SPM, SSG and SFM), were previously reported by us to take place in epitaxially self-assembled silicide NSs of transition and rare-earth metals, of nonferromagnetic bulk phase origins [ 16 , 17 , 18 , 19 , 20 , 21 ]. Often, at least one-dimensional (1D) in-plane ordering of self-assembled silicide phase NSs can be achieved by their decoration of the periodic vicinal Si(hkl) surface step bunches [ 22 , 23 ], as shown in Figure 1 for 5°-miscut Si(111) in this work.…”

Section: Introductionmentioning

confidence: 58%

Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

et al. 2021

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We report the epitaxial formation of metastable γ-(FexNi1−x)Si2 nanostructure arrays resulting from the reaction of Ni80Fe20 permalloy with vicinal Si(111) surface atoms. We then explore the effect of structure and composition on the nanostructure’s magnetic properties. The low-temperature annealing (T < 600 °C) of a pre-deposited permalloy film led to solid-phase epitaxial nucleation of compact disk-shaped island nanostructures decorating <110> ledges of the stepped surface, with either (2 × 2) or (3×3) R30° reconstructed flat top faces. High resolution scanning transmission electron microscopy analysis demonstrated fully coherent epitaxy of the islands with respect to the substrate, consistent with a well-matched CaF2-prototype structure associated with γ-FeSi2, along perfect atomically sharp interfaces. Energy dispersive spectroscopy detected ternary composition of the islands, with Fe and Ni atoms confined to the islands, and no trace of segregation. Our magnetometry measurements revealed the superparamagnetic behavior of the silicide islands, with a blocking temperature around 30 K, reflecting the size, shape, and dilute arrangement of the islands in the assembly.

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Section: Introductionmentioning

confidence: 58%

Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

et al. 2021

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“…refs. []). In UHV (base pressure 1 × 10 −8 Pa), after thorough degassing, the native silicon oxide was evaporated by repeated flashes at 1150–1200 °C, and the clean Si surface was slowly cooled until well‐ordered (7 × 7) reconstruction appeared in diffraction and STM (pristine surface similar to that in ref.…”

Section: Methodsmentioning

confidence: 99%

“…According to these studies, NiSi 2 films grow epitaxially on Si(111) surface with a (√3 × √3) reconstruction. Other studies suggest that Ni 2 Si, rather than NiSi 2 , forms a (√3 × √3) reconstructed top . Growth of epitaxial films may result in the formation of metastable structures as well, and the characterization of such a multitude of possible surface structures facilitates the need for in situ identification of their crystallography and chemistry.…”

Section: Introductionmentioning

confidence: 99%

Interface Effects on Epilayer Surface Density of States by Scanning Tunneling Spectroscopy and Density Functional Theory

Dascalu

Levi

Cesura

et al. 2019

Advcd Theory and Sims

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Sub-nanometric Ni-silicide films are self-assembled by solid phase epitaxy of Ni on a vicinal Si(111) surface. The combination of in situ scanning tunneling microscopy and surface electron diffraction with ex situ X-ray photoelectron spectroscopy allows us to identify -Ni 2 Si as the major constituent crystal phase at the overgrown surface. Then scanning tunneling spectroscopy is employed with ab initio electronic structure calculations, to identify the origins of the surface local density of states and use these as a fingerprint for in situ phase identification. The above approach enhances the chemical contrast capability of scanning tunneling microscopy, and offers a useful local probe with atomic resolution for in situ crystal phase identification of ultra-thin surface structures.

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“…By implanting nitrogen under the critical conditions, the growth of metal-rich silicide phases is circumvented, as the Ni film converts to the amorphous NiSi phase during annealing 19 . Because of the interest in developing novel spintronic devices, explorations directed toward attempting to combine the charge and spin degrees of freedoms have increased dramatically 12–28 . Based on a successful combination of a solution process and the efficient control of the electric potential for magnetism, a novel concept of electric-potential-tuned magnetic recording has been developed, resulting in the development of stable recording media with a high degree of writing ability 20 .…”

Section: Introductionmentioning

confidence: 99%

“…Because of the low resistivity and low fabrication temperature, Ni/Si systems are widely used in the electronics industry as ohmic contacts and interconnects 44,45 . Applications of Ni silicides span numerous areas, including their use in silicon complementary metal-oxide semiconductors 5,12 , field effect transistors 11 , batteries 46,47 and floating gate memory 22 . Ni 2 Si, NiSi and NiSi 2 all appear to be present at Ni/Si interfaces and the composition is dependent on the temperature of the sample and the preparation procedure 6,48,49 .…”

Section: Introductionmentioning

confidence: 99%

Enhancing silicide formation in Ni/Si(111) by Ag-Si particles at the interface

Chang

Jiang

Chow

et al. 2019

Sci Rep

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Compound formation at a metal/semiconductor interface plays crucial roles in the properties of many material systems. Applications of Ni silicides span numerous areas and have the potential to be used as new functionalities. However, the magnetic properties of ultrathin Ni layers on silicon surfaces and related chemical compositions at the interface are not fully understood and the influence of Ag additives on the reactivity of Ni/Si(111) remain unclear. We report herein on the fact that the dominant species produced at the interface is NiSi, which is produced by the spontaneous formation of strong bonds between Ni and Si atoms. Assuming that a Ni layer is formed over a NiSi layer with the total coverage as a constraint, we established a chemical shift-related concentration model that, in effect, represents a practical method for determining the amount of ultrathin Ni silicides that are produced at the buried interface. The formation of Ag-Si particles provide a viable strategy for enhancing silicide formation via a specific interaction transfer mechanism, even at room temperature. The mechanism is related to differences in the enthalpies of formation ΔH Ag-Si , ΔH Ni-Ag , and ΔH Ni-Si , for these phases and provides insights into strategies for producing ultrathin silicides at a buried interface.

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Self-organized growth and magnetic properties of epitaxial silicide nanoislands

Cited by 16 publications

References 73 publications

Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate

Interface Effects on Epilayer Surface Density of States by Scanning Tunneling Spectroscopy and Density Functional Theory

Enhancing silicide formation in Ni/Si(111) by Ag-Si particles at the interface

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