Long spin lifetime and large barrier polarisation in single electron transport through a CoFe nanoparticle

Temple, Rowan C.; McLaren, Mathew; Brydson, Rik; Hickey, B. J.; Marrows, C. H.

doi:10.1038/srep28296

Cited by 7 publications

(5 citation statements)

References 48 publications

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“…It is important to note that, after the reduction at 650 °C in 10 –6 mbar, the exsolved NPs still exhibited a band gap of 0.6 eV. Due to Coulomb blockade effect, a metal particle on semiconductor matrix may exhibit semiconductor characteristics. − Nevertheless, due to high operating temperature and large size of NPs, the small band gap we observed in the current–voltage spectra for NPs is not likely due to the Coulomb blockade effect from interaction of the metal nanoparticles and semiconductor matrix (Supporting Information text S1e). , These results suggest that the initial exsolved NPs on our materials system are likely to be metal oxide instead of metal phase.…”

Section: Resultsmentioning

confidence: 67%

Electronic Activation during Nanoparticle Exsolution for Enhanced Activity at Elevated Temperature

et al. 2023

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Nanoparticle (NP) exsolution from perovskite-based oxides matrix upon reduction has emerged as an ideal platform for designing highly active catalysts for energy and environmental applications. However, the mechanism of how the material characteristics impacts the activity is still ambiguous. In this work, taking Pr0.4Sr0.6Co0.2Fe0.7Nb0.1O3 thin film as the model system, we demonstrate the critical impact of the exsolution process on the local surface electronic structure. Combining advanced microscopic and spectroscopic techniques, particularly scanning tunneling microscopy/spectroscopy and synchrotron-based near ambient X-ray photoelectron spectroscopy, we find that the band gaps of both the oxide matrix and exsolved NP decrease during exsolution. Such changes are attributed to the defect state within the forbidden band introduced by oxygen vacancies and the charge transfer across the NP/matrix interface. Both the electronic activations of oxide matrix and the exsolved NP phase lead to good electrocatalytic activity toward the fuel oxidation reaction at elevated temperature.

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Section: Resultsmentioning

confidence: 67%

Electronic Activation during Nanoparticle Exsolution for Enhanced Activity at Elevated Temperature

et al. 2023

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“…Within the model, they all have the same electronic density, in contrast to Stoner excitations. Since the measured values of T 1,s in metallic ferromagnetic nanoparticles are up to 10 µs long, [22,[34][35][36] we find that the observed value T 1,d ≃ 10 ms is plausible.…”

mentioning

confidence: 54%

“…Prior measurements of the relaxation time T 1,s of Stoner excitations in metallic ferromagnetic nanoparticles yield unusually large values, of T 1,s ∼ 0.1 µs using nonequilibrium tunneling spectroscopy at mK-temperature, [22] and T 1,s ∼ 0.1 − 10 µs using spin accumulation. [34][35][36] Since in our measurement the electron tunneling time e/I n is shorter than T 1,s , the electronic subsystem is out of equilibrium, fluctuating between Stoner excitations within the energy range eV /k B ∼ 100 K. [33,37] Next we examine how electron tunneling and the nonequilibrium electronic distribution impart dynamics in the magnetic subsystem. Tunneling and internal relaxation transitions in the electronic subsystem produce spin-orbit energy fluctuations, which can induce transitions between the states of the magnetic subsystem.…”

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confidence: 95%

Spin noise and damping in individual metallic ferromagnetic nanoparticles

et al. 2017

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We introduce a highly sensitive and relatively simple technique to observe magnetization motion in single Ni nanoparticles, based on charge sensing by electron tunneling at millikelvin temperature. Sequential electron tunneling via the nanoparticle drives nonequilibrium magnetization dynamics, which induces an effective charge noise that we measure in real time. In the free spin diffusion regime, where the electrons and magnetization are in detailed balance, we observe that magnetic damping time exhibits a peak with the magnetic field, with a record long damping time of ≃ 10 ms.

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“…Nanoscale entities, such as metal nanoparticles, semiconductor quantum dots, dielectric nanoparticles, and magnetic nanoparticles (here, we collectively call them nanoparticles), have been the subjects of intensive studies due to their novel electrical, optical, and magnetic properties that their bulk counterparts cannot provide. Their unique properties and applications include atom-like energy levels, − Coulomb blockade in single-electron transport, − single-photon sources, , on-demand generation of entangled photon pairs, , plasmonics, − surface plasmon amplification by the stimulated emission of radiation (spaser), − spaser nanoparticle laser, magnetic dipole resonances in the visible spectral range, , and catalysts . To implement these in practical integrated systems, however, it is essential to have reliable methods that can controllably place those single nanoparticles onto the desired substrate positions with nanoscale precision.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ionic Strength, Nanoparticle Surface Charge Density, and Template Diameter on Self-Limiting Single-Particle Placement: A Numerical Study

2021

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For the bottom-up approach where functional materials are constructed out of nanoscale building blocks (e.g., nanoparticles), it is essential to have methods that are capable of placing the individual nanoscale building blocks onto exact substrate positions on a large scale and on a large area. One of the promising placement methods is the self-limiting single-particle placement (SPP), in which a single nanoparticle in a colloidal solution is electrostatically guided by electrostatic templates and exactly one single nanoparticle is placed on each target position in a self-limiting way. This paper presents a numerical study on SPP, where the effects of three key parameters, (1) ionic strength (IS), (2) nanoparticle surface charge density (σ NP ), and (3) circular template diameter (d), on SPP are investigated. For 40 different parameter sets of (IS, σ NP , d), a 30 nm nanoparticle positioned at R ⃗ above the substrate was modeled in two configurations (i) without and (ii) with the presence of a 30 nm nanoparticle at the center of a circular template. For each parameter set and each configuration, the electrostatic potentials were calculated by numerically solving the Poisson-Boltzmann equation, from which interaction forces and interaction free energies were subsequently calculated. These have identified realms of parameter sets that enable a successful SPP. A few exemplary parameter sets include (IS, σ NP , d) = (0.5 mM, −1.5 μC/cm 2 , 100 nm), (0.05 mM, −0.5 μC/cm 2 , 100 nm), (0.5 mM, −1.5 μC/cm 2 , 150 nm), and (0.05 mM, −0.8 μC/cm 2 , 150 nm). This study provides clear guidance toward experimental realizations of large-scale and large-area SPPs, which could lead to bottom-up fabrications of novel electronic, photonic, plasmonic, and spintronic devices and sensors.

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Long spin lifetime and large barrier polarisation in single electron transport through a CoFe nanoparticle

Cited by 7 publications

References 48 publications

Electronic Activation during Nanoparticle Exsolution for Enhanced Activity at Elevated Temperature

Electronic Activation during Nanoparticle Exsolution for Enhanced Activity at Elevated Temperature

Spin noise and damping in individual metallic ferromagnetic nanoparticles

Effect of Ionic Strength, Nanoparticle Surface Charge Density, and Template Diameter on Self-Limiting Single-Particle Placement: A Numerical Study

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