Driving magnetic skyrmions with microwave fields

Wang, Weiwei; Beg, Marijan; Zhang, Bin; Kuch, W.; Fangohr, Hans

doi:10.1103/physrevb.92.020403

Cited by 101 publications

(91 citation statements)

References 40 publications

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“…We have confirmed that not only the crystallized magnetic skyrmions (skyrmion crystal) but also isolated skyrmions in ferromagnets can be excited resonantly by application of a microwave field, which offers a better experimental feasibility because a lot of ferromagnet/heavy-metal bilayer systems turned out to host magnetic skyrmions as topological defects [28,[54][55][56]. Recent theoretical studies revealed that activation of the skyrmion breathing mode under application of a magnetic field inclined from the vertical direction induces translational motion of the skyrmions [57][58][59], which provides a means to drive magnetic skyrmions electrically with a low energy consumption. Our finding provides a promising technique to manipulate noncollinear magnetic textures with a great efficiency that have potential applications in memory, logic, and microwave devices.…”

Section: Discussionsupporting

confidence: 62%

Electrically driven spin torque and dynamical Dzyaloshinskii-Moriya interaction in magnetic bilayer systems

Takeuchi

Mizushima

Mochizuki

2019

Sci Rep

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Efficient control of magnetism with electric means is a central issue of current spintronics research, which opens an opportunity to design integrated spintronic devices. However, recent well-studied methods are mostly based on electric-current injection, and they are inevitably accompanied by considerable energy losses through Joule heating. Here we theoretically propose a way to exert spin torques into magnetic bilayer systems by application of electric voltages through taking advantage of the Rashba spin-orbit interaction. The torques resemble the well-known electric-current-induced torques, providing similar controllability of magnetism but without Joule-heating energy losses. The torques also turn out to work as an interfacial Dzyaloshinskii-Moriya interaction which enables us to activate and create noncollinear magnetism like skyrmions by electric-voltage application. Our proposal offers an efficient technique to manipulate magnetizations in spintronics devices without Joule-heating energy losses.

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Section: Discussionsupporting

confidence: 62%

Electrically driven spin torque and dynamical Dzyaloshinskii-Moriya interaction in magnetic bilayer systems

Takeuchi

Mizushima

Mochizuki

2019

Sci Rep

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“…Furthermore, all the parameters are with reduced units for simplicity and set to be ħ=1/6, γ=6, S=1 and the lattice constant a=1, respectively. To convert the parameters to SI units, one should consider the coefficients the magnetic field h=J 1 /(ħγS), time t=6ħS/J 1 , and the velocity v=J 1 a/(6ħS) [20]. If one take J 1 =0.1 meV, S=1 and a=0.5 nm, the magnetic field h∼0.8 T, the strength of h-gradient ∇h∼10 −4 T/a, and v∼12 m s −1 are estimated.…”

Section: Model and Methodsmentioning

confidence: 99%

Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets

Liang

et al. 2018

New J. Phys.

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The study of skyrmion/antiskyrmion motion in magnetic materials is very important in particular for the spintronics applications. In this work, we study the dynamics of isolated skyrmions and antiskyrmions in frustrated magnets driven by magnetic field gradient, using the Landau-Lifshitz-Gilbert simulations on the frustrated classical Heisenberg model on the triangular lattice. A Hall-like motion induced by the gradient is revealed in bulk system, similar to that in the well-studied chiral magnets. More interestingly, our work suggests that the lateral confinement in nanostripes of the frustrated system can completely suppress the Hall motion and significantly speed up the motion along the gradient direction. The simulated results are well explained by Thiele theory. It is demonstrated that the acceleration of the motion is mainly determined by the Gilbert damping constant, which provides useful information for finding potential materials for skyrmion-based spintronics.

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“…Low-frequency collective modes of the two-dimensional Skyrmion lattice are well understood theoretically [19][20][21] and demonstrated by microwave experiments [22][23][24]. They arise from either the breathing mode (when Skyrmions expand and contract periodically) or the small cyclotron-like motion of the center of mass of the Skyrmions.…”

mentioning

confidence: 99%

“…Instead, layer-by-layer analysis of the Skyrmion density variation over time revealed some oscillatory behavior reminiscent of the Skyrmion's center-of-mass motion in the two-dimensional crystal. Real-time calculations for the two-dimensional Skyrmion lattice done in the past assumed a large Skyrmion radius [19,22,23]. The slow collective motion was easy to identify, typically by visual inspection of the real-time video generated from solving the LLG equation.…”

mentioning

confidence: 99%

Formation of a topological monopole lattice and its dynamics in three-dimensional chiral magnets

2016

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Topologically protected swirl of the magnetic texture known as the Skyrmion has become ubiquitous in both metallic and insulating chiral magnets. Meanwhile the existence of its three-dimensional analogue, known as the magnetic monopole, has been suggested by various indirect experimental signatures in MnGe compound. Theoretically, Ginzburg-Landau arguments in favor of the formation of a three-dimensional crystal of monopoles and anti-monopoles have been put forward, however no microscopic model Hamiltonian was shown to support such a phase. Here we present strong numerical evidence from Monte Carlo simulations for the formation of a rock-salt crystal structure of monopoles and anti-monopoles in short-period chiral magnets. Real-time simulation of the spin dynamics suggests there is only one collective mode in the monopole crystal state in the frequency range of several GHz for the material parameters of MnGe.PACS numbers: 12.39. Dc, 75.10.Hk, 75.40.Mg Attempts to view building blocks of nature as topologically protected objects such as knots have been a fascinating feature of modern physical science. The knot theory of atoms advanced by Thomson (Lord Kelvin) [1] was re-incarnated by Skyrme as a topological quantum theory of hadrons in the early 60s [2]. Although the topological interpretation of quantum numbers for elementary particles may not have been universally accepted in subatomic physics, the beauty of the idea has remained well within the physics community and, quite recently, found immense physical realization in several kinds of magnetic materials ranging from B20 metallic magnetic compounds [3][4][5], atomically-thin magnetic layers [6], multiferroic insulators [7], to ferroelectrics [8]. The form of the topological matter, now called the Skyrmion lattice, bears excellent resemblance to the well-known vortex lattice in type-II superconductors [9] and shares the character of two dimensionality, extending its existence in a columnar fashion when the host material in which it is formed is three-dimensional. The topological vortex and Skyrmion lattices have both been observed successfully through the visualization technique of Lorentz microscopy [5,10].In higher dimensions one is granted the exciting opportunity to create, observe, and manipulate topological objects not permitted in lower dimensions. For example in three-dimensional Heisenberg magnets with a local unit magnetization vector n r , localized objects known as monopoles and anti-monopoles with integer topological numbers may be formed. The number characterizing the object's topology isfor an integration domain S , parameterized by (u, v), enclosing the monopole center R. Due to the high energetic cost of creating monopoles in isolation, they must be created in reality as a monopole-anti-monopole (MAM) pair, or as a crystal of such pairs forming a new kind of topological lattice unique to three dimensions. Such possibility was suggested theoretically [11] some time ago following the intriguing discovery of diffuse neutron scattering peaks i...

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Driving magnetic skyrmions with microwave fields

Cited by 101 publications

References 40 publications

Electrically driven spin torque and dynamical Dzyaloshinskii-Moriya interaction in magnetic bilayer systems

Electrically driven spin torque and dynamical Dzyaloshinskii-Moriya interaction in magnetic bilayer systems

Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets

Formation of a topological monopole lattice and its dynamics in three-dimensional chiral magnets

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