Controlling avalanche criticality in 2D nano arrays

Zohar, Yaara; Yochelis, Shira; Dahmen, Karin A.; Jung, G.; Paltiel, Yossi

doi:10.1038/srep01845

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…Theoretical models describing avalanche noise relate the onset of avalanches to critical coupling which depends on disorder . Avalanche noise has also been shown in the nanoscale in organic SAM coupled to semiconductor quantum dots . Here the coupling could be related to changes in current distribution upon magnetizing individual FMNPs.…”

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confidence: 89%

Magnetic Nanoplatelet‐Based Spin Memory Device Operating at Ambient Temperatures

et al. 2017

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There is an increasing demand for realizing a simple Si based universal memory device working at ambient temperatures. In principle, nonvolatile magnetic memory can operate at low power consumption and high frequencies. However, in order to compete with existing memory technology, size reduction and simplification of the used material systems are essential. In this work, the chiral-induced spin selectivity effect is used along with 30-50 nm ferromagnetic nanoplatelets in order to realize a simple magnetic memory device. The vertical memory is Si compatible, easy to fabricate, and in principle can be scaled down to a single nanoparticle size. Results show clear dual magnetization behavior with threefold enhancement between the one and zero states. The magnetization of the device is accompanied with large avalanche like noise that is ascribed to the redistribution of current densities due to spin accumulation inducing coupling effects between the different nanoplatelets.

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confidence: 89%

Magnetic Nanoplatelet‐Based Spin Memory Device Operating at Ambient Temperatures

et al. 2017

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“…It is a great challenge to control avalanche processes [16,17]. In superconductors, the most common ways to control the fast flux instabilities were through nano-morphology [18] or optimization of the heat transfer through coating a superconducting film with a metal layer [19].…”

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confidence: 99%

Thermally Driven Inhibition of Superconducting Vortex Avalanches

et al. 2017

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Complex systems close to their critical state can exhibit abrupt transitions -avalanches -between their metastable states. It is a challenging task to understand the mechanism of the avalanches and control their behavior. Here we investigate microwave (mw) stimulation of avalanches in the socalled vortex matter of type II superconductors -a system of interacting Abrikosov vortices close to the critical (Bean) state. Our main finding is that the avalanche incubation strongly depends on the excitation frequency, a completely unexpected behavior observed close to the so-called depinning frequencies. Namely, the triggered vortex avalanches in Pb superconducting films become effectively inhibited approaching the critical temperature or critical magnetic field when the mw stimulus is close to the vortex depinning frequency. We suggest a simple model explaining the observed counterintuitive behaviors as a manifestation of the strongly nonlinear dependence of the driven vortex core size on the mw excitation intensity. This paves the way to controlling avalanches in superconductorbased devices through their nonlinear response.

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“…Catastrophic avalanches are found widely in solids, such as slip events in earthquake faults 1 2 , dislocations in crystalline metals 3 4 5 6 7 8 , and sandpiles 9 , which should be avoided for safety reasons. Recently, a similar phenomenon has been observed in the plastic flow of bulk metallic glasses (BMGs), a class of amorphous alloys without the presence of periodic atomic structures 10 11 12 13 .…”

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confidence: 99%

Loading-rate-independent delay of catastrophic avalanches in a bulk metallic glass

Chen

Chan

Wang

et al. 2016

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The plastic flow of bulk metallic glasses (BMGs) is characterized by intermittent bursts of avalanches, and this trend results in disastrous failures of BMGs. In the present work, a double-side-notched BMG specimen is designed, which exhibits chaotic plastic flows consisting of several catastrophic avalanches under the applied loading. The disastrous shear avalanches have, then, been delayed by forming a stable plastic-flow stage in the specimens with tailored distances between the bottoms of the notches, where the distribution of a complex stress field is acquired. Differing from the conventional compressive testing results, such a delaying process is independent of loading rate. The statistical analysis shows that in the specimens with delayed catastrophic failures, the plastic flow can evolve to a critical dynamics, making the catastrophic failure more predictable than the ones with chaotic plastic flows. The findings are of significance in understanding the plastic-flow mechanisms in BMGs and controlling the avalanches in relating solids.

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Controlling avalanche criticality in 2D nano arrays

Cited by 9 publications

References 20 publications

Magnetic Nanoplatelet‐Based Spin Memory Device Operating at Ambient Temperatures

Magnetic Nanoplatelet‐Based Spin Memory Device Operating at Ambient Temperatures

Thermally Driven Inhibition of Superconducting Vortex Avalanches

Loading-rate-independent delay of catastrophic avalanches in a bulk metallic glass

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