scholarly journals Magnetic skyrmions in cylindrical ferromagnetic nanostructures with chiral interactions

2020 ◽  
Vol 102 (5) ◽  
Author(s):  
D. Kechrakos ◽  
L. Tzannetou ◽  
A. Patsopoulos
Keyword(s):  
Ferromagnetic Nanostructures ◽  
Chiral Interactions ◽  
Magnetic Skyrmions

scholarly journals Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Anthony K. C. Tan ◽  
Pin Ho ◽  
James Lourembam ◽  
Lisen Huang ◽  
Hang Khume Tan ◽  
...  
Keyword(s):  
Hall Effect ◽  
Topological Charge ◽  
Size Dependence ◽  
Particle Model ◽  
Model Simulations ◽  
Generation Computing ◽  
Magnetic Skyrmions ◽  
Transverse Deflection ◽  
Robust Framework ◽  
Geometric Effects

AbstractMagnetic skyrmions are nanoscale spin textures touted as next-generation computing elements. When subjected to lateral currents, skyrmions move at considerable speeds. Their topological charge results in an additional transverse deflection known as the skyrmion Hall effect (SkHE). While promising, their dynamic phenomenology with current, skyrmion size, geometric effects and disorder remain to be established. Here we report on the ensemble dynamics of individual skyrmions forming dense arrays in Pt/Co/MgO wires by examining over 20,000 instances of motion across currents and fields. The skyrmion speed reaches 24 m/s in the plastic flow regime and is surprisingly robust to positional and size variations. Meanwhile, the SkHE saturates at ∼22∘, is substantially reshaped by the wire edge, and crucially increases weakly with skyrmion size. Particle model simulations suggest that the SkHE size dependence — contrary to analytical predictions — arises from the interplay of intrinsic and pinning-driven effects. These results establish a robust framework to harness SkHE and achieve high-throughput skyrmion motion in wire devices.

Chiral Emission of Exchange Spin Waves by Magnetic Skyrmions

ACS Nano ◽  
2021 ◽  
Author(s):  
Jilei Chen ◽  
Junfeng Hu ◽  
Haiming Yu
Keyword(s):  
Spin Waves ◽  
Magnetic Skyrmions

scholarly journals Deriving the skyrmion Hall angle from skyrmion lattice dynamics

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
R. Brearton ◽  
L. A. Turnbull ◽  
J. A. T. Verezhak ◽  
G. Balakrishnan ◽  
P. D. Hatton ◽  
...  
Keyword(s):  
High Efficiency ◽  
Magnetic Field Gradient ◽  
Real Space ◽  
Magnetic Multilayer ◽  
Multilayer Systems ◽  
Space Technique ◽  
Hall Angle ◽  
Lattice State ◽  
The Many ◽  
Magnetic Skyrmions

AbstractMagnetic skyrmions are topologically non-trivial, swirling magnetization textures that form lattices in helimagnetic materials. These magnetic nanoparticles show promise as high efficiency next-generation information carriers, with dynamics that are governed by their topology. Among the many unusual properties of skyrmions is the tendency of their direction of motion to deviate from that of a driving force; the angle by which they diverge is a materials constant, known as the skyrmion Hall angle. In magnetic multilayer systems, where skyrmions often appear individually, not arranging themselves in a lattice, this deflection angle can be easily measured by tracing the real space motion of individual skyrmions. Here we describe a reciprocal space technique which can be used to determine the skyrmion Hall angle in the skyrmion lattice state, leveraging the properties of the skyrmion lattice under a shear drive. We demonstrate this procedure to yield a quantitative measurement of the skyrmion Hall angle in the room-temperature skyrmion system FeGe, shearing the skyrmion lattice with the magnetic field gradient generated by a single turn Oersted wire.

scholarly journals Realization of ordered magnetic skyrmions in thin films at ambient conditions

2019 ◽  
Vol 3 (10) ◽  
Author(s):  
Ryan D. Desautels ◽  
Lisa DeBeer-Schmitt ◽  
Sergio A. Montoya ◽  
Julie A. Borchers ◽  
Soong-Geun Je ◽  
...  
Keyword(s):  
Thin Films ◽  
Ambient Conditions ◽  
Magnetic Skyrmions

scholarly journals Helium Ions Put Magnetic Skyrmions on the Track

Nano Letters ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2989-2996
Author(s):  
Roméo Juge ◽  
Kaushik Bairagi ◽  
Kumari Gaurav Rana ◽  
Jan Vogel ◽  
Mamour Sall ◽  
...  
Keyword(s):  
Helium Ions ◽  
Magnetic Skyrmions

scholarly journals Emulating spin transport with nonlinear optics, from high-order skyrmions to the topological Hall effect

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Aviv Karnieli ◽  
Shai Tsesses ◽  
Guy Bartal ◽  
Ady Arie
Keyword(s):  
Photonic Crystals ◽  
Hall Effect ◽  
Optical System ◽  
Crystal Engineering ◽  
Spin Transport ◽  
Research Effort ◽  
Nonlinear Photonic Crystals ◽  
Topological Hall Effect ◽  
Magnetic Skyrmions ◽  
Quantum Optical

AbstractExploring material magnetization led to countless fundamental discoveries and applications, culminating in the field of spintronics. Recently, research effort in this field focused on magnetic skyrmions – topologically robust chiral magnetization textures, capable of storing information and routing spin currents via the topological Hall effect. In this article, we propose an optical system emulating any 2D spin transport phenomena with unprecedented controllability, by employing three-wave mixing in 3D nonlinear photonic crystals. Precise photonic crystal engineering, as well as active all-optical control, enable the realization of effective magnetization textures beyond the limits of thermodynamic stability in current materials. As a proof-of-concept, we theoretically design skyrmionic nonlinear photonic crystals with arbitrary topologies and propose an optical system exhibiting the topological Hall effect. Our work paves the way towards quantum spintronics simulations and novel optoelectronic applications inspired by spintronics, for both classical and quantum optical information processing.

Sign in / Sign up

Export Citation Format

Share Document