Magnetic Anisotropy Variations and Nonequilibrium Tunneling in a Cobalt Nanoparticle

Deshmukh, Mandar M.; Kleff, Silvia; Guéron, S.; Bonet, Edgar; Pasupathy, Abhay; Delft, Jan von; Ralph, Daniel

doi:10.1103/physrevlett.87.226801

Cited by 63 publications

(129 citation statements)

References 15 publications

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“…These conditions correspond to line III in the data of Ref. 8. Figure 9 shows the available transitions together with the corresponding transition rates.…”

Section: Two Levels Accessiblementioning

confidence: 99%

“…3(b) of Ref. 8. For positive δ, the effect of non-equilibrium is to produce an extra step in the I-V curve at voltages larger than the position of the δ = 0 current step.…”

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

“…However, measurements on metal nanoparticles indicate that the relaxation rate is generally comparable to or slower than the tunneling rate in realistic samples. 7,8 Therefore we will generally neglect internal relaxation effects entirely, limiting ourselves to noting the ways in which internal relaxation will produce qualitative changes to the results.…”

Section: Rate-equation Calculations Of Current Flowmentioning

confidence: 99%

“…When the interaction-induced shifts are comparable to k B T , they have been observed to produce an effective broadening of the observed conductance peaks. 8 For larger interactions, shifts due to non-equilibrium excitations have been resolved individually. 7,12 …”

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

“…8 For larger interactions, shifts due to non-equilibrium excitations have been resolved individually. 7,12 …”

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

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Solving rate equations for electron tunneling via discrete quantum states

2002

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We consider the form of the current-voltage curves generated when tunneling spectroscopy is used to measure the energies of individual electronic energy levels in nanometer-scale systems. We point out that the voltage positions of the tunneling resonances can undergo temperature-dependent shifts, leading to errors in spectroscopic measurements that are proportional to temperature. We do this by solving the set of rate equations that can be used to describe electron tunneling via discrete quantum states, for a number of cases important for comparison to experiments, including (1) when just one spin-degenerate level is accessible for transport, (2) when 2 spin-degenerate levels are accessible, with no variation in electron-electron interactions between eigenstates, and (3) when 2 spin-degenerate levels are accessible, but with variations in electron-electron interactions. We also comment on the general case with an arbitrary number of accessible levels. In each case we analyze the voltage-positions, amplitudes, and widths of the current steps due to the quantum states.

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“…These conditions correspond to line III in the data of Ref. 8. Figure 9 shows the available transitions together with the corresponding transition rates.…”

Section: Two Levels Accessiblementioning

confidence: 99%

“…3(b) of Ref. 8. For positive δ, the effect of non-equilibrium is to produce an extra step in the I-V curve at voltages larger than the position of the δ = 0 current step.…”

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

Section: Rate-equation Calculations Of Current Flowmentioning

confidence: 99%

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

“…8 For larger interactions, shifts due to non-equilibrium excitations have been resolved individually. 7,12 …”

Section: Two Levels Accessible With Variations In the Interactionsmentioning

confidence: 99%

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Solving rate equations for electron tunneling via discrete quantum states

2002

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Magnetism of Nanoparticles: Effects of Size, Shape, and Interactions

Koksharov

2009

Magnetic Nanoparticles

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Encoding Information on the Excited State of a Molecular Spin Chain

Katcko

Urbain

Ngassam

et al. 2021

Adv Funct Materials

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The quantum states of nano‐objects can drive electrical transport properties across lateral and local‐probe junctions. This raises the prospect, in a solid‐state device, of electrically encoding information at the quantum level using spin‐flip excitations between electron spins. However, this electronic state has no defined magnetic orientation and is short‐lived. Using a novel vertical nanojunction process, these limitations are overcome and this steady‐state capability is experimentally demonstrated in solid‐state spintronic devices. The excited quantum state of a spin chain formed by Co phthalocyanine molecules coupled to a ferromagnetic electrode constitutes a distinct magnetic unit endowed with a coercive field. This generates a specific steady‐state magnetoresistance trace that is tied to the spin‐flip conductance channel, and is opposite in sign to the ground state magnetoresistance term, as expected from spin excitation transition rules. The experimental 5.9 meV thermal energy barrier between the ground and excited spin states is confirmed by density functional theory, in line with macrospin phenomenological modeling of magnetotransport results. This low‐voltage control over a spin chain's quantum state and spintronic contribution lay a path for transmitting spin wave‐encoded information across molecular layers in devices. It should also stimulate quantum prospects for the antiferromagnetic spintronics and oxides electronics communities.

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Magnetic Anisotropy Variations and Nonequilibrium Tunneling in a Cobalt Nanoparticle

Cited by 63 publications

References 15 publications

Solving rate equations for electron tunneling via discrete quantum states

Solving rate equations for electron tunneling via discrete quantum states

Magnetism of Nanoparticles: Effects of Size, Shape, and Interactions

Encoding Information on the Excited State of a Molecular Spin Chain

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