Current‐Induced Nucleation and Annihilation of Magnetic Skyrmions at Room Temperature in a Chiral Magnet

Yu, Xiaojiang; Morikawa, Daichi; Tokunaga, Yusuke; Kubota, Masashi; Kurumaji, Takashi; Ôike, Hiroshi; Nakamura, Masao; Kagawa, Fumitaka; Taguchi, Y.; Arima, T.; Kawasaki, Masashi; Tokura, Y.

doi:10.1002/adma.201606178

Cited by 60 publications

(52 citation statements)

References 26 publications

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“…Thus, the interfaces between the heavy-metal layer and the ultrathin FM layer hosting isolated skyrmions caused by the interfacial DMI have been investigated extensively (10)(11)(12)(13)(14). However, compared with the small current density J C for controls of SkX in chiral-lattice magnets with intrinsic DMI (3,4,(20)(21)(22), driving of interfacial skyrmions requires higher J C (~10 12 A m −2 ) to overcome the random pinning potential in the real material interfaces, which strongly depends on the film quality (10)(11)(12)(13)(14)(23)(24)(25)(26).…”

Section: Introductionmentioning

confidence: 99%

Motion tracking of 80-nm-size skyrmions upon directional current injections

Morikawa

Nakajima

et al. 2020

Sci. Adv.

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Nanometer-scale skyrmions are prospective candidates for information bits in low–power consumption devices owing to their topological nature and controllability with low current density. Studies on skyrmion dynamics in different classes of materials have exploited the topological Hall effect and current-driven fast motion of skyrmionic bubbles. However, the small current track motion of a single skyrmion and few-skyrmion aggregates remains elusive. Here, we report the tracking of creation and extinction and motion of 80-nm-size skyrmions upon directional one–current pulse excitations at low current density of the order of 109 A m−2 in designed devices with the notched hole. The Hall motion of a single skyrmion and the torque motions of few-skyrmion aggregates have been directly revealed. The results exemplify low–current density controls of skyrmions, which will pave the way for the application of skyrmions.

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Section: Introductionmentioning

confidence: 99%

Motion tracking of 80-nm-size skyrmions upon directional current injections

Morikawa

Nakajima

et al. 2020

Sci. Adv.

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“…To efficiently build high-performance skyrmion-based devices a reliable and controllable way to create skyrmions is needed. So far several techniques to obtain single skyrmions have been proposed [18,[27][28][29][30][31][32][33][34][35][36][37][38][39]. However, most of them either require specialized setups or artificially tuned parameters.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion production on demand by homogeneous DC currents

et al. 2017

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Topological magnetic textures-like skyrmions-are major players in the design of next-generation magnetic storage technology due to their stability and the control of their motion by ultra-low currents. A major challenge to develop new skyrmion-based technologies is the controlled creation of magnetic skyrmions without the need of complex setups. We show how to create skyrmions and other magnetic textures in ferromagnetic thin films by means of a homogeneous DC current and without requiring Dzyaloshinskii-Moriya interactions. This is possible by exploiting a static loss of stability arising from the interplay of current-induced spin-transfer-torque and a spatially inhomogeneous magnetization, which can be achieved, e.g., by locally engineering the anisotropy, the magnetic field, or other magnetic interactions. The magnetic textures are created controllably and efficiently with a period that can be tuned by the applied current strength. We propose a specific experimental setup realizable with simple materials, such as cobalt based materials, to observe the periodic formation of skyrmions. We show that adding chiral interactions will not influence the basics of the generations but the consequent dynamics w.r.t. the stabilization of topological textures. Our findings allow for skyrmion production on demand in simple ferromagnetic thin films by homogeneous DC currents.

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“…Recently, two bulk crystalline materials have been shown by Lorentz Transmission Electron Microscopy (LTEM) and Small Angle Neutron Scattering (SANS) to have a skyrmions lattice near or at room temperature: Co x -Zn y -Mn z alloys 38 , 39 , and stoichiometric cubic FeGe 10 , 37 , 40 – 42 . In FeGe, magnetisation 43 , specific heat measurements 44 , and microwave absorption spectroscopy 45 also identified several magnetic phases compatible with skyrmions.…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Lattice Topological Hall Effect near Room Temperature

Leroux

Stolt

Jin

et al. 2018

Sci Rep

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Magnetic skyrmions are stable nanosized spin structures that can be displaced at low electrical current densities. Because of these properties, they have been proposed as building blocks of future electronic devices with unprecedentedly high information density and low energy consumption. The electrical detection of an ordered skyrmion lattice via the Topological Hall Effect (THE) in a bulk crystal, has so far been demonstrated only at cryogenic temperatures in the MnSi family of compounds. Here, we report the observation of a skyrmion lattice Topological Hall Effect near room temperature (276 K) in a mesoscopic lamella carved from a bulk crystal of FeGe. This region coincides with the skyrmion lattice location revealed by neutron scattering. We provide clear evidence of a re-entrant helicoid magnetic phase adjacent to the skyrmion phase, and discuss the large THE amplitude (5 nΩ.cm) in view of the ordinary Hall Effect.

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Current‐Induced Nucleation and Annihilation of Magnetic Skyrmions at Room Temperature in a Chiral Magnet

Cited by 60 publications

References 26 publications

Motion tracking of 80-nm-size skyrmions upon directional current injections

Motion tracking of 80-nm-size skyrmions upon directional current injections

Skyrmion production on demand by homogeneous DC currents

Skyrmion Lattice Topological Hall Effect near Room Temperature

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