Spin-current signal amplification by a geometrical ratchet

Abdullah, Ranjdar M.; Vick, Andrew; Murphy, Benedict Andrew; Hirohata, Atsufumi

doi:10.1088/0022-3727/47/48/482001

Cited by 6 publications

(6 citation statements)

References 18 publications

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“…In the case of normal metal elements, reciprocity relations prove impossible "geometric spin ratchets" 19,20 that would amplify spin current or even transmit it differently in two directions.…”

Section: Discussionmentioning

confidence: 99%

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Reciprocity in diffusive spin-current circuits

Bazaliy

Ramazashvili

2019

Phys. Rev. B

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Similarly to their purely electric counterparts, spintronic circuits may be presented as networks of lumped elements. Due to interplay between spin and charge currents, each element is described by a matrix conductance. We establish reciprocity relations between the entries of the conductance matrix of a multi-terminal linear device, comprising normal metallic and strong ferromagnetic elements with spin-inactive interfaces between them. In particular, reciprocity equates the spin transmissions through a two-terminal element in the opposite directions. When applied to "geometric spin ratchets", reciprocity shows that certain effects, announced for such devices, are, in fact, impossible. Finally, we discuss the relation between our work and the spintronic circuit theory formalism.

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Section: Discussionmentioning

confidence: 99%

“…This naturally raises the issue of finding systems with longer spin propagation lengths. One interesting proposal 19,20 involves optimizing the geometric shape of a conductor -and a claim that, in an arrow-shaped normal wire ( Fig. 6(a)), spin transmission is enhanced as compared with a rectangular wire ( Fig.…”

Section: No Geometric Spin Ratchetsmentioning

confidence: 99%

Reciprocity in diffusive spin-current circuits

Bazaliy

Ramazashvili

2019

Phys. Rev. B

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“…The lateral spin–valve devices were fabricated by conventional electron-beam lithography and lift-off processes on a Si substrate with a thermally oxidised layer on the surface 20 . Two Ni 0.8 Fe 0.2 nanowires were designed to be 30 nm thick and 200 nm wide with different shapes at their ends (square and sharp) to induce a difference in their magnetization-reversal fields.…”

Section: Methodsmentioning

confidence: 99%

Non-destructive imaging of buried electronic interfaces using a decelerated scanning electron beam

et al. 2016

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Recent progress in nanotechnology enables the production of atomically abrupt interfaces in multilayered junctions, allowing for an increase in the number of transistors in a processor. However, uniform electron transport has not yet been achieved across the entire interfacial area in junctions due to the existence of local defects, causing local heating and reduction in transport efficiency. To date, junction uniformity has been predominantly assessed by cross-sectional transmission electron microscopy, which requires slicing and milling processes that can potentially introduce additional damage and deformation. It is therefore essential to develop an alternative non-destructive method. Here we show a non-destructive technique using scanning electron microscopy to map buried junction properties. By controlling the electron-beam energy, we demonstrate the contrast imaging of local junction resistances at a controlled depth. This technique can be applied to any buried junctions, from conventional semiconductor and metal devices to organic devices.

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“…Spin ratchet effects, which can open novel ways for efficient generation and control of spin fluxes [28], attracted growing attention. Since the first work, several different origins of spin ratchet currents have been suggested and discussed [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45], for review see [46]. For example, it has been shown that a stationary spin current can be generated by applying an ac driving current to a symmetric or asymmetric periodic structure with Rashba spin-orbit coupling.…”

Section: Introductionmentioning

confidence: 99%