Universality of defect-skyrmion interaction profiles

Fernandes, Imara Lima; Bouaziz, Juba; Blügel, Stefan; Lounis, Samir

doi:10.1038/s41467-018-06827-5

Cited by 80 publications

(80 citation statements)

References 46 publications

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“…δ < 0 (δ > 0) characterizes repulsive (attractive) defects [19]. The kind of defects necessary for creating these rails could be obtained by locally modifying the spin-orbit coupling with different materials [39][40][41][42], voltage gating using Brillouin light spectroscopy [43], inducing interfacial defects [44], current injection [22], lithographic techniques [45,46]. Here we are considering defects at the atomic scale (as those in Refs.…”

Section: Results For a Single Line Defectmentioning

confidence: 99%

Accelerating, guiding, and compressing skyrmions by defect rails

et al. 2019

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Magnetic skyrmions are promising candidates as information carriers in spintronic devices. The transport of individual skyrmions in a fast and controlled way is a key issue in this field. Here we introduce a novel platform for accelerating, guiding and compressing skyrmions along predefined paths. The guiding mechanism is based on two parallel line defects (rails), one attractive and the other repulsive. Numerical simulations, using parameters from state-of-the-art experiments, show that the speed of the skyrmions along the rails can be increased up to an order of magnitude with respect to the non-defect case whereas the distance between rails can be as small as the initial radius of the skyrmions. In this way, the flux of information that can be coded and transported with magnetic skyrmions could be significantly increased.

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Section: Results For a Single Line Defectmentioning

confidence: 99%

Accelerating, guiding, and compressing skyrmions by defect rails

et al. 2019

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“…Here, two concomitant mechanisms are at play. First the hybridization strength is known to decrease from left-to-right and to increase from up-to-down across the transition element series of the periodic table 37 . Second, the p z state induced in the electronic structure of the impurities depends on the magnetic coupling because of the switch of the spin-nature of the impurity states hybridizing with the minority-spin states of Fe.…”

Section: Resultsmentioning

confidence: 99%

“…While several investigations were devoted to the impact of inhomogeneities on the motion and stability of skyrmions [28][29][30][31][32][33][34][35][36][37][38][39] , their implications in their electrical detection are yet to be determined. Similarly to the GMR and TMR effects, it is often expected that defects would reduce the XMR efficiency.…”

mentioning

confidence: 99%

Defect-implantation for the all-electrical detection of non-collinear spin-textures

2020

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The viability of past, current and future devices for information technology hinges on their sensitivity to the presence of impurities. The latter can reshape extrinsic Hall effects or the efficiency of magnetoresistance effects, essential for spintronics, and lead to resistivity anomalies, the so-called Kondo effect. Here, we demonstrate that atomic defects enable highly efficient all-electrical detection of spin-swirling textures, in particular magnetic skyrmions, which are promising bit candidates in future spintronics devices. The concomitant impurity-driven alteration of the electronic structure and magnetic non-collinearity gives rise to a new spin-mixing magnetoresistance (XMR defect). Taking advantage of the impuritiesinduced amplification of the bare transport signal, which depends on their chemical nature, a defect-enhanced XMR (DXMR) is proposed. Both XMR modes are systematised for 3d and 4d transition metal defects implanted at the vicinity of skyrmions generated in PdFe bilayer deposited on Ir(111). The ineluctability of impurities in devices promotes the implementation of defect-enabled XMR modes in reading architectures with immediate implications in magnetic storage technologies.

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“…There are still several differences in that the chiral active spinning particles always undergo circular motion, whereas in the absence of confinement, skyrmions subjected to an ac drive move along 1D paths, with circular orbits appearing only due to the presence of a confining potential or similar quenched disorder. The pinning potential we consider is produced by pinned skyrmions; however, it is possible to create other types of confining potentials, such as by using nanoscale pinning sites that repel skyrmions, by modifying the materials properties along the edges or in stripe patterns [67,68], or by using nanowires with rough edges [69].…”

Section: Discussionmentioning

confidence: 99%

Chiral edge currents for ac-driven skyrmions in confined pinning geometries

Reichhardt

2019

Phys. Rev. B

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We show that ac driven skyrmion lattices in a weak pinning channel confined by regions of strong pinning exhibit edge transport carried by skipping orbits while skyrmions in the bulk of the channel undergo localized orbits with no net transport. The magnitude of the edge currents can be controlled by varying the amplitude and frequency of the ac drive or by changing the ratio of the Magnus force to the damping term. We identify a localized phase in which the orbits are small and edge transport is absent, an edge transport regime, and a fluctuating regime that appears when the ac drive is strong enough to dynamically disorder the skyrmion lattice. We also find that in some cases, multiple rows of skyrmions participate in the transport due to a drag effect from the skyrmionskyrmion interactions. The edge currents are robust for finite disorder and should be a general feature of skyrmions interacting with confined geometries or inhomogeneous disorder under an ac drive. We show that similar effects can occur for skyrmion lattices at interfaces or along domain boundaries for multiple coexisting skyrmion species. The edge current effect provides a new method to control skyrmion motion, and we discuss the connection of these results with recent studies on the emergence of edge currents in chiral active matter systems and gyroscopic metamaterials.

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Universality of defect-skyrmion interaction profiles

Cited by 80 publications

References 46 publications

Accelerating, guiding, and compressing skyrmions by defect rails

Accelerating, guiding, and compressing skyrmions by defect rails

Defect-implantation for the all-electrical detection of non-collinear spin-textures

Chiral edge currents for ac-driven skyrmions in confined pinning geometries

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