Tuning an Atomic Switch on a Surface with Electric and Magnetic Fields

Polyakov, O. P.; Stepanyuk, V. S.

doi:10.1021/acs.jpclett.5b01634

Cited by 9 publications

(4 citation statements)

References 40 publications

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“…In addition to experimental work, a theoretical model for fieldassisted migration has been developed to create atomic gaps between gold nanoelectrodes using ab initio calculations. [278,289] This configuration evaluates gold nanostructures during tension and compression to understand the mechanism. In field-assisted atomic migration (FAAM), the external field provides the driving force, improves the initial energy of the system, reduces the potential barrier in the migration path, and enables atomic migration.…”

Section: Electric Field Driven Atomic Switchmentioning

confidence: 99%

Toward Practical Single‐Molecule/Atom Switches

Xu,

Gao,

Emusani

et al. 2024

Advanced Science

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Electronic switches have been considered to be one of the most important components of contemporary electronic circuits for processing and storing digital information. Fabricating functional devices with building blocks of atomic/molecular switches can greatly promote the minimization of the devices and meet the requirement of high integration. This review highlights key developments in the fabrication and application of molecular switching devices. This overview offers valuable insights into the switching mechanisms under various stimuli, emphasizing structural and energy state changes in the core molecules. Beyond the molecular switches, typical individual metal atomic switches are further introduced. A critical discussion of the main challenges for realizing and developing practical molecular/atomic switches is provided. These analyses and summaries will contribute to a comprehensive understanding of the switch mechanisms, providing guidance for the rational design of functional nanoswitch devices toward practical applications.

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Section: Electric Field Driven Atomic Switchmentioning

confidence: 99%

Toward Practical Single‐Molecule/Atom Switches

Xu,

Gao,

Emusani

et al. 2024

Advanced Science

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“…Despite its macroscopic origin, it has been shown that this equation is useful for studying the magnetization dynamics of nanostructures. [37][38][39][40][41] The LLG equation adapted for atomic-scale systems can be written as 42…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Impact of surface strain on the spin dynamics of deposited Co nanowires

Polyakov

Korobova

Stepanyuk

et al. 2017

Journal of Applied Physics

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Tailoring the magnetic properties at atomic-scale is essential in the engineering of modern spintronics devices. One of the main concerns in the novel nanostructured materials design is the decrease of the paid energy in the way of functioning, but allowing to switch between different magnetic states with a relative low-cost energy at the same time. Magnetic anisotropy (MA) energy defines the stability of a spin in the preferred direction and is a fundamental variable in magnetization switching processes. Transition-metal wires are known to develop large, stable spin and orbital magnetic moments together with MA energies that are orders of magnitude larger than in the corresponding solids. Different ways of controlling the MA have been exploited such as alloying, surface charging, and external electrical fields. Here we investigate from a first-principle approach together with dynamic calculations, the surface strain driven mechanism to tune the magnetic properties of deposited nanowires. We consider as a prototype system, the monoatomic Co wires deposited on strained Pt(111) and Au(111) surfaces. Our first-principles calculations reveal a monotonic increase/decrease of MA energy under compressive/tensile strain in supported Co wire. Moreover, the spin dynamics studies based on solving the Landau-Lifshitz-Gilbert equation show that the induced surface-strain leads to a substantial decrease of the required external magnetic field magnitude for magnetization switching in Co wire.

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“…External control of adsorbate motion on surfaces is interesting both for the fundamental understanding of the mechanisms in play, and for the development of novel nanoscale devices. Possible technical applications include, e.g., functional nanostructures designed by areaselective atom deposition [1], atomic/molecular switches [2,3] or ion traps based on electric fields, such as Paul traps [4], which are important for quantum computing.…”

Section: Introductionmentioning

confidence: 99%

Electromigration forces on atoms on graphene nanoribbons: The role of adsorbate-surface bonding

Leitherer

Brandbyge

Solomon

2023

Preprint

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Atom diffusion on surfaces induced by a bias voltage or external electric fields has received increasing attention in both experimental and theoretical studies. In this work, we study such electromigration phenomena by placing different atom types on two-dimensional armchair graphene nanoribbons in an electric field along the ribbon and examining the electromigration force with ab- initio simulation techniques. Our findings show that the forces are related to the induced charges in the adsorbate-surface bonds rather than to the induced atomic charges, and the left/right effective bond order can be used to predict the force direction. Focusing in particular on 3d orbital transition metal atoms, we show how a simple model of a metal atom on benzene can explain the forces in an inorganic chemistry picture. This study demonstrates how the underlying bonding and molecular orbital structure becomes relevant for the definition of electromigration forces on the nanoscale. Accordingly extended models including the ligand field of the atoms might provide a better understanding of adsorbate diffusion on surfaces under non-equilibrium conditions.

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Tuning an Atomic Switch on a Surface with Electric and Magnetic Fields

Cited by 9 publications

References 40 publications

Toward Practical Single‐Molecule/Atom Switches

Toward Practical Single‐Molecule/Atom Switches

Impact of surface strain on the spin dynamics of deposited Co nanowires

Electromigration forces on atoms on graphene nanoribbons: The role of adsorbate-surface bonding

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