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Nanomaterials
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Epitaxial Self-Assembly of Magnetic Nanostructures
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Epitaxial Self-Assembly of Magnetic Nanostructures

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 7187

Special Issue Editor

Prof. Dr. Ilan Goldfarb

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Faculty of Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel;Research Center for Nanoscience and Nanotechnology, Tel Aviv University, Ramat Aviv, Tel Aviv 6997801, Israel
Interests: materials science; surface science; nanoscience and nanotechnology; epitaxial growth; self-assembly and self-organization on surfaces; functional nanostructures; scanning tunneling microscopy; photoelectron spectroscopy; electronic structure and properties of thin films

Special Issue Information

Dear Colleagues,

The last three decades have been revolutionary for the field of nanoscience and nanotechnology. This revolution has been facilitated by an immense progress in the methods of nanostructure fabrication, allowing for a more precise control over the size, shape, and position of the synthesized nanostructures, accompanied by a practically simultaneous development of higher-resolution characterization tools, such as scanning probe microscopy (SPM, most notably in a scanning tunneling mode (STM)), and aberration-corrected high-resolution transmission electron microscopy (HR-TEM).   

Most research efforts were naturally drawn to exploration of quantum confinement and single-electron tunneling effects in low-dimensional nanostructures, driven by the need to develop new-generation optoelectronic technology. Magnetic properties of nanometric size structures have received less attention in spite of the ever-growing demand for higher-density data storage and spintronic devices. This Special Issue of Nanomaterials will be dedicated to recent advances in magnetism of epitaxially self-assembled nanostructures, including experimental and theoretical aspects of growth and evolution of epitaxial nanostructures, their structural and magnetic ordering and phase transformations, and the resulting individual and collective magnetic behavior of nanostructure arrays. One of the most important questions we shall attempt to address is to what extent the observed magnetism is governed by intrinsic (bulk-like) and extrinsic (size effect) contributions. 

Prof. Dr. Ilan Goldfarb
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Advanced synthesis and characterization
  • Advanced theoretical methods
  • Origins of magnetism in nanostructures
  • Bulk and size/shape effects
  • Individual and collective behavior
  • Interacting and non-interacting ensembles

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Published Papers (3 papers)

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Research

14 pages, 5828 KiB  
Article
Increasing Magnetic Anisotropy in Bimetallic Nanoislands Grown on fcc(111) Metal Surfaces
by Sergio Vlaic, Dimitris Mousadakos, Safia Ouazi, Stefano Rusponi and Harald Brune
Nanomaterials 2022, 12(3), 518; https://doi.org/10.3390/nano12030518 - 2 Feb 2022
Cited by 1 | Viewed by 1772
Abstract
The magnetic properties and the atomic scale morphology of bimetallic two-dimensional nanoislands, epitaxially grown on fcc(111) metal surfaces, have been studied by means of Magneto-Optical Kerr Effect and Scanning Tunneling Microscopy. We investigate the effect on blocking temperature of one-dimensional interlines appearing in [...] Read more.
The magnetic properties and the atomic scale morphology of bimetallic two-dimensional nanoislands, epitaxially grown on fcc(111) metal surfaces, have been studied by means of Magneto-Optical Kerr Effect and Scanning Tunneling Microscopy. We investigate the effect on blocking temperature of one-dimensional interlines appearing in core-shell structures, of two-dimensional interfaces created by capping, and of random alloying. The islands are grown on Pt(111) and contain a Co-core, surrounded by Ag, Rh, and Pd shells, or capped by Pd. The largest effect is obtained by Pd capping, increasing the blocking temperature by a factor of three compared to pure Co islands. In addition, for Co-core Fe-shell and Co-core FexCo1−x-shell islands, self-assembled into well ordered superlattices on Au(11,12,12) vicinal surfaces, we find a strong enhancement of the blocking temperature compared to pure Co islands of the same size. These ultra-high-density (15 Tdots/in2) superlattices of CoFe nanodots, only 500 atoms in size, have blocking temperature exceeding 100 K. Our findings open new possibilities to tailor the magnetic properties of nanoislands. Full article
(This article belongs to the Special Issue Epitaxial Self-Assembly of Magnetic Nanostructures)
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10 pages, 4283 KiB  
Article
Lattice-Match Stabilization and Magnetic Properties of Metastable Epitaxial Permalloy-Disilicide Nanostructures on a Vicinal Si(111) Substrate
by Anjan Bhukta, Dror Horvitz, Amit Kohn and Ilan Goldfarb
Nanomaterials 2021, 11(5), 1310; https://doi.org/10.3390/nano11051310 - 16 May 2021
Cited by 1 | Viewed by 2585
Abstract
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 [...] Read more.
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. Full article
(This article belongs to the Special Issue Epitaxial Self-Assembly of Magnetic Nanostructures)
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Graphical abstract

10 pages, 3640 KiB  
Article
Origin of Magnetism in γ-FeSi2/Si(111) Nanostructures
by Liwei D. Geng, Sahil Dhoka, Ilan Goldfarb, Ranjit Pati and Yongmei M. Jin
Nanomaterials 2021, 11(4), 849; https://doi.org/10.3390/nano11040849 - 26 Mar 2021
Cited by 6 | Viewed by 2179
Abstract
Magnetism has recently been observed in nominally nonmagnetic iron disilicide in the form of epitaxial γ-FeSi2 nanostructures on Si(111) substrate. To explore the origin of the magnetism in γ-FeSi2/Si(111) nanostructures, we performed a systematic first-principles study based on density functional [...] Read more.
Magnetism has recently been observed in nominally nonmagnetic iron disilicide in the form of epitaxial γ-FeSi2 nanostructures on Si(111) substrate. To explore the origin of the magnetism in γ-FeSi2/Si(111) nanostructures, we performed a systematic first-principles study based on density functional theory. Several possible factors, such as epitaxial strain, free surface, interface, and edge, were examined. The calculations show that among these factors, only the edge can lead to the magnetism in γ-FeSi2/Si(111) nanostructures. It is shown that magnetism exhibits a strong dependency on the local atomic structure of the edge. Furthermore, magnetism can be enhanced by creating multiple-step edges. In addition, the results also reveal that edge orientation can have a significant effect on magnetism. These findings, thus, provide insights into a strategy to tune the magnetic properties of γ-FeSi2/Si(111) nanostructures through controlling the structure, population, and orientation of the edges. Full article
(This article belongs to the Special Issue Epitaxial Self-Assembly of Magnetic Nanostructures)
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