Electron field emission properties of Co quantum dots in SiO2 matrix synthesised by ion implantation

Tsang, W.M.; Stolojan, Vlad; Sealy, B.J.; Wong, S.P.; Silva, S. Ravi P.

doi:10.1016/j.ultramic.2007.02.013

Cited by 19 publications

(8 citation statements)

References 17 publications

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“…This approach broadly follows the theory of Raichev 36 . The theory has been experimentally confirmed by a few groups 37 38 39 , however the data presented here are probably the clearest example of this type of tunnelling in a single metallic particle to date. More complicated effects predicted due to electric charge distribution in the nanoparticle are not observed here 36 .…”

Section: Resultssupporting

confidence: 60%

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

Temple

McLaren

Brydson

et al. 2016

Sci Rep

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We have investigated single electron spin transport in individual single crystal bcc Co30Fe70 nanoparticles using scanning tunnelling microscopy with a standard tungsten tip. Particles were deposited using a gas-aggregation nanoparticle source and individually addressed as asymmetric double tunnel junctions with both a vacuum and a MgO tunnel barrier. Spectroscopy measurements on the particles show a Coulomb staircase that is correlated with the measured particle size. Field emission tunnelling effects are incorporated into standard single electron theory to model the data. This formalism allows spin-dependent parameters to be determined even though the tip is not spin-polarised. The barrier spin polarisation is very high, in excess of 84%. By variation of the resistance, several orders of magnitude of the system timescale are probed, enabling us to determine the spin relaxation time on the island. It is found to be close to 10 μs, a value much longer than previously reported.

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Section: Resultssupporting

confidence: 60%

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

Temple

McLaren

Brydson

et al. 2016

Sci Rep

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“…Such circumstances can appear experimentally in various configurations 1,6,8 but a dedicated experiment is needed to sustain the theoretical model presented above. Therefore, we have devised a FE setup that is able to replicate the apparition of the staircases in the current-voltage diagrams.…”

Section: Methodsmentioning

confidence: 97%

“…Recent studies of advanced materials have succeeded in obtaining a whole new class of composites such as nanometer-sized particles 1 and nanotubes 2 with significant potential for electron field-emission ͑FE͒ applications. Such materials have generated a great deal of interest due to their unique behavior in FE regimes.…”

Section: Introductionmentioning

confidence: 99%

“…A multitude of examples can be found in the literature where steplike I-V's appear. 1,6,8 The explanation behind the peculiar behavior of the I-V characteristics resides in the existence of nanometer-sized particles ͑or layers͒ on the sample that produces corresponding nonmonotonic spatial variations in the potential energy. In order to gain a deeper understanding of the quantum-confinement implications in the FE process from nanoparticles, a onedimensional ͑1D͒ two-step FE model is examined in this study.…”

Section: Introductionmentioning

confidence: 99%

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Two-step electron tunneling from confined electronic states in a nanoparticle

et al. 2009

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Sequential two-step electron tunneling from nanoparticles has been studied from a transport point of view. A steady-state balance equation for the partial electron currents is derived and solved to obtain the stationary level occupancy, which leads to the overall tunneling current as a function of the applied field. Our model explains the steplike features observed in high field tunneling experiments involving composite cathodes that incorporate electronic quantum-confinement regions. In order to assess the validity of our model and to show the apparition of the steplike features in field-emission experiments, we have used the usual diode configuration to obtain current-voltage characteristics from a composite cathode. The theoretical model presented in this paper shows qualitative agreement with the experimental data.

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“…The charging effect will effectively shut off the tunneling path through the Fe QDs, and thus reduce the resonant tunneling current significantly, giving rise to a region with an NDR. In fact, Tsang et al [20] recently reported their field-emission studies on Co QDs implanted into thermally oxidized SiO 2 layers. In their work, repeatable staircaselike current-field characteristics are observed in field-emission measurements, which are believed to be a result of Coulomb blockade effects arising from the isolated low-capacitance metal QDs.…”

Section: Article In Pressmentioning

confidence: 99%

Observation of negative differential resistance from a Schottky-barrier structure embedded with Fe quantum dots

Lok

Wang

et al. 2009

Journal of Crystal Growth

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Electron field emission properties of Co quantum dots in SiO2 matrix synthesised by ion implantation

Cited by 19 publications

References 17 publications

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

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

Two-step electron tunneling from confined electronic states in a nanoparticle

Observation of negative differential resistance from a Schottky-barrier structure embedded with Fe quantum dots

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