Static and dynamic depinning processes of a magnetic domain wall from a pinning potential

Pi, Ung Hwan; Cho, Young Jin; Bae, Jae Young; Lee, Sung Chul; Seo, Sunae; Kim, Woojin; Moon, Jung Hwan; Lee, Kyung Jin; Lee, Hyun Woo

doi:10.1103/physrevb.84.024426

Cited by 32 publications

(28 citation statements)

References 17 publications

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“…36,37 These transformations cause variable interactions with defect sites and result in both stochastic DW pinning, where inhibition of DW propagation by a defect becomes probabilistic, 12,14,17,38,39 and stochastic DW depinning, where the distribution of fields/currents required to depin DWs from defects adopt multi-mode characters. 11,13,15,16,38,39 . W ntiate them from their simpler, thermally activated counterparts.…”

Section: Introductionmentioning

confidence: 99%

Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering

et al. 2020

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“…This phenomenon, called plastic depinning, has received considerable attention and has been studied extensively in various physical systems, including colloids, electron crystals, charge-density waves (CDW), magnetic domain walls and vortices in type-II superconductors. Practically, understanding the pinning and depinning processes of driven systems is of great importance, e.g., for the application of logic and memory devices in spintronic [25] and flux-based superconducting circuits. From a fundamental viewpoint, the depinning phenomenon has also attracted growing interest.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior associated with transient dynamics near the depinning transition

Okuma

Motohashi

2012

New J. Phys.

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We study the general phenomenon of plastic depinning using a vortex system confined in a Corbino-disc superconductor. For an ordered initial vortex configuration, the vortices driven by a suddenly applied dc current (force) are gradually pinned to random pinning centers, indicating dynamic disordering. This is detected from the decaying of voltage V (t) (mean velocity) toward a steady-state value V ∞ . On the other hand, when the initial configuration is disordered, a gradual increase of V (t) toward V ∞ is observed, reflecting dynamic ordering. In both cases, relaxation times to reach the steady state exhibit a power-law divergence at the depinning current. Our results clearly show that the transient response depends on the initial vortex configurations: however, the transient time as well as the final mean vortex velocity only depends on the applied current, and the critical behaviors of the depinning transition are identical. To the best of our knowledge, this work is the first to demonstrate this fact predicted by numerical simulations and other more indirect experiments (e.g. Pérez Daroca et al 2011 Phys. Rev. B 84 012508).

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“…First, DW pinning and depinning has been widely observed to have stochastic character [20,21], a feature that would clearly disrupt the operation of gates. There are two possible causes of such behavior: Walker-breakdowninduced transformations of the DWs during propagation [22,23] and thermally induced effects once they are pinned [24]. In our simulations, we suppress Walker breakdown phenomena by using a high value of the Gilbert damping parameter (α ¼ 0.5).…”

Section: Discussionmentioning

confidence: 99%

Chirality-Based Vortex Domain-Wall Logic Gates

Omari

Hayward

2014

Phys. Rev. Applied

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We use micromagnetic simulations to demonstrate the feasibility of creating magnetic logic gates that process binary data encoded within the internal magnetization structure of domain walls in ferromagnetic nanowires. In the simulated nanowires, domain walls take the form of magnetic vortices, where the magnetization circulates either clockwise or anticlockwise. By exploiting differences in how these two domain-wall states interact with both notch-shaped defects and junctions in the nanowires, we design nanowire segments that act as NOT, FAN-OUT, NAND, AND, OR, and NOR logic gates. Potentially, these gates could be cascaded to perform any desired logical operation. Our simulations demonstrate the possibility of a class of magnetic devices in which domain walls carry digital information rather than merely delineate it.

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Static and dynamic depinning processes of a magnetic domain wall from a pinning potential

Cited by 32 publications

References 17 publications

Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering

Suppression of Dynamically Induced Stochastic Magnetic Behavior Through Materials Engineering

Critical behavior associated with transient dynamics near the depinning transition

Chirality-Based Vortex Domain-Wall Logic Gates

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