A ferromagnetic skyrmion-based diode with a voltage-controlled potential barrier

Zhao, Li; Xue, Lunsheng; Xia, Jingbo; Zhao, Guoping; Zhou, Yan

doi:10.1039/c9nr10528j

Cited by 43 publications

(33 citation statements)

References 68 publications

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“…Using the inate topological properties of skyrmions is in contrast to other predicted skyrmion ratchet devices that rely on asymmetric anisotropy gradients 43 or pinning sites 44 along the racetrack, or on using skyrmionshape modulations to generate a weak net forces from periodic magnetic fields 45,46 . Instead, the here presented approach, based on the topology of skyrmions, is more related to the observed directed rotation of a skyrmion lattice due to thermal fluctuations of the chiral spin texture 47 and to the recently predicted skyrmion diode 48,49 that allows for skyrmion propagation only along one direction when a current is applied. The results are related to the Magnus-induced dynamics of skyrmions and other particles as reported in Refs.…”

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confidence: 99%

Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Göbel

Mertig

2021

Sci Rep

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Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents, skyrmions move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded a drawback for memory applications. Herein, we show that this unique effect can also be favorable for spintronic applications: We show that in a racetrack with a broken inversion symmetry, the skyrmion Hall effect allows to translate an alternating current into a directed motion along the track, like in a ratchet. We analyze several modes of the ratchet mechanism and show that it is unique for topological magnetic whirls. We elaborate on the fundamental differences compared to the motion of topologically trivial magnetic objects, as well as classical particles driven by periodic forces. Depending on the exact racetrack geometry, the ratchet mechanism can be soft or strict. In the latter case, the skyrmion propagates close to the efficiency maximum.

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mentioning

confidence: 99%

Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Göbel

Mertig

2021

Sci Rep

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“…of a skyrmion lattice due to thermal fluctuations of the chiral spin texture 47 and to the recently predicted skyrmion diode 48 that allows for skyrmion propagation only along one direction when a current is applied. The results are related to the Magnus-induced dynamics of skyrmions and other particles as reported in Refs.…”

Section: Introductionmentioning

confidence: 87%

Skyrmion ratchet propagation: Utilizing the skyrmion Hall effect in AC racetrack storage devices

Göbel,

Mertig

2020

Preprint

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Magnetic skyrmions are whirl-like nano-objects with topological protection. When driven by direct currents (DC), skyrmions move but experience a transverse deflection. This so-called skyrmion Hall effect is often regarded a drawback for memory applications. Herein, we show that this unique effect can also be favorable for spintronic applications: We show that in a racetrack with a broken inversion symmetry, the skyrmion Hall effect allows to translate an alternating current (AC) into a directed motion along the track, like in a ratchet. We analyze several modes of the ratchet mechanism and show that it is unique for topological magnetic whirls. We elaborate on the fundamental differences compared to the motion of topologically trivial magnetic objects, as well as classical particles driven by periodic forces. Depending on the exact racetrack geometry, the ratchet mechanism can be soft or strict. In the latter case, the skyrmion propagates close to the efficiency maximum.

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“…Among these topological solitons, the 2D magnetic skyrmions in magnetic materials with Dzyaloshinskii-Moriya interactions (DMIs) have aroused much interest [20,21] due to their prominent properties, such as their nanoscale size and low driving current density [22]. Besides, magnetic skyrmions can be used as information carrier in future spintronic applications [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mutual conversion between a magnetic Neel hopfion and a Neel toron

Li,

Xia,

Shen

et al. 2022

Preprint

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Three-dimensional (3D) magnetic textures attract great attention from researchers due to their fascinating structures and dynamic behaviors. Magnetic hopfion is a prominent example of 3D magnetic textures. Here, we numerically study the mutual conversion between a Néel-type hopfion and a Néel-type toron under an external magnetic field. We also investigate the excitation modes of hopfions and torons in a film with strong perpendicular magnetic anisotropy. It is found that the Néel-type hopfion could be a stable state in the absence of the external magnetic field, and its diameter varies with the out-of-plane magnetic field. The Néel-type hopfion may transform to a Néel-type toron at an out-of-plane magnetic field of about 20 mT, where the cross section structure is a Néel-type skyrmion. The hopfion and toron show different excitation modes in the presence of an in-plane microwave magnetic field. Our results provide a method to realize the conversion between a Néel-type hopfion and a Néel-type toron, which also gives a way to distinguish Bloch-type and Néel-type hopfions.

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A ferromagnetic skyrmion-based diode with a voltage-controlled potential barrier

Abstract: We propose a feasible skyrmion-based diode model using VCMA, and study the dynamic behavior of the skyrmion.

Cited by 43 publications

References 68 publications

Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Skyrmion ratchet propagation: utilizing the skyrmion Hall effect in AC racetrack storage devices

Skyrmion ratchet propagation: Utilizing the skyrmion Hall effect in AC racetrack storage devices

Mutual conversion between a magnetic Neel hopfion and a Neel toron

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